Статті в журналах: "Coating durability"

1

Fedyaev, Vladimir, Engel Galimov, Alexey Belyaev, and Liliya Sirotkina. "Durability of Polymer Powder Coatings." MATEC Web of Conferences 346 (2021): 02043. http://dx.doi.org/10.1051/matecconf/202134602043.

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The durability of polymer powder coatings is considered. The features of the impact on coatings during their operation of the environment, loads from the side of the substrate on the surface of its contact with the coatings, parameters that depend on the chemical composition and structure of the coating material are briefly analyzed. The thickness of the coating stands out as the main indicators of durability; a function that characterizes the continuity, strength, corrosion resistance, and its other properties; adhesive strength. It is proposed to use a generalized (integral) criterion for a comprehensive accounting of these indicators. An equation is written to assess the durability of the considered coatings, in a particular case, a formula is given for calculating their permissible operating time.

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2

Hirohata, Mikihito, Tomonori Nakahara, and Károly Jármai. "Life cycle cost analysis on anti-corrosion coatings for steel bridges in Japan." Multidiszciplináris tudományok 11, no. 5 (2021): 92–103. http://dx.doi.org/10.35925/j.multi.2021.5.10.

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A series of surveys on the cost and durability of anti-corrosion coatings for steel bridges used in Japan was performed. The life cycle cost of anti-corrosion coatings for steel bridges during their design service periods was examined under different corrosion environments. The combinations of heavy-duty paint coating system as initial coating and the same coating system as repair coating showed the lowest cost when the short interval applied for the repair work. The metal coatings might be reasonable under severe corrosion environments due to their high durability.

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3

Donadei, Valentina, Heli Koivuluoto, Essi Sarlin, and Petri Vuoristo. "Durability of Lubricated Icephobic Coatings under Various Environmental Stresses." Polymers 14, no. 2 (January 12, 2022): 303. http://dx.doi.org/10.3390/polym14020303.

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Icephobic coatings interest various industries facing icing problems. However, their durability represents a current limitation in real applications. Therefore, understanding the degradation of coatings under various environmental stresses is necessary for further coating development. Here, lubricated icephobic coatings were fabricated using a flame spray method with hybrid feedstock injection. Low-density polyethylene represented the main coating component. Two additives, namely fully hydrogenated cottonseed oil and paraffinic wax, were added to the coating structure to enhance coating icephobicity. Coating properties were characterised, including topography, surface roughness, thermal properties, wettability, and icephobicity. Moreover, their performance was investigated under various environmental stresses, such as repeated icing/deicing cycles, immersion in corrosive media, and exposure to ultraviolet (UV) irradiation. According to the results, all coatings exhibited medium-low ice adhesion, with slightly more stable icephobic behaviour for cottonseed oil-based coatings over the icing/deicing cycles. Surface roughness slightly increased, and wetting performances decreased after the cyclic tests, but chemical changes were not revealed. Moreover, coatings demonstrated good chemical resistance in selected corrosive media, with better performance for paraffin-based coatings. However, a slight decrease in hydrophobicity was detected due to surface structural changes. Finally, paraffin-based coatings showed better resistance under UV irradiation based on carbonyl index and colour change measurements.

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4

Piispanen, Minna, Thomas Kronberg, Sami Areva, Joe Pimenoff, and Leena Hupa. "Easy-to-Clean Coatings on Glass and Glazed Surfaces." Advances in Science and Technology 66 (October 2010): 150–55. http://dx.doi.org/10.4028/www.scientific.net/ast.66.150.

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Glass and glazes are easy-to-clean surfaces often used in everyday environments where the surface needs to repel soils and deposits. In general, these surfaces have good chemical durability in everyday environments. However, the durability is rapidly degraded in solutions of high or low pH. This kind of surface corrosion has been found to diminish the cleanability. Surface topography has also a certain influence on the soil attachment and cleanability. Self-cleaning and easy-to-clean coatings have been employed to enhance the cleanability of surfaces. In this report surface properties of three coatings reported to enhance the cleanability of glass and glazed surfaces are summarized. The properties discussed are the surface appearance, roughness, wettability, soil attachment and soil removal. Also the chemical and mechanical durability of the coatings are discussed. The coatings studied were a commercial fluoropolymer film applied at room temperature, an experimental sol-gel derived TiO2 coating calcined at 500°C, and an experimental liquid flame sprayed TiO2-Ag coating applied on the substrates at 500-800°C. The advantages of the fluoropolymer coating are easy application and soil good soil repellence, but the coating has limited chemical and mechanical durability. The manufacture of the sol-gel TiO2 coating requires several processing steps. The coated surface showed excellent cleanability, and good chemical and mechanical durability. The liquid flame sprayed coating has potential to be applied online in the material manufacture. However, the processing parameters should be optimized in order to achieve desired improvements in the cleanability.

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5

Rosales, A., A. Maury-Ramírez, R. Mejía-De Gutiérrez, C. Guzmán, and K. Esquivel. "SiO2@TiO2 Coating: Synthesis, Physical Characterization and Photocatalytic Evaluation." Coatings 8, no. 4 (March 24, 2018): 120. http://dx.doi.org/10.3390/coatings8040120.

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Use of silicon dioxide (SiO2) and titanium dioxide (TiO2) have been widely investigated individually in coatings technology, but their combined properties promote compatibility for different innovative applications. For example, the photocatalytic properties of TiO2 coatings, when exposed to UV light, have interesting environmental applications, such as air purification, self-cleaning and antibacterial properties. However, as reported in different pilot projects, serious durability problems, associated with the adhesion between the substrate and TiO2, have been evidenced. Thus, the aim of this work is to synthesize SiO2 together with TiO2 to increase the durability of the photocatalytic coating without affecting its photocatalytic potential. Therefore, synthesis using sonochemistry, synthesis without sonochemistry, physical characterization, photocatalytic evaluation, and durability of the SiO2, SiO2@TiO2 and TiO2 coatings are presented. Results indicate that using SiO2 improved the durability of the TiO2 coating without affecting its photocatalytic properties. Thus, this novel SiO2@TiO2 coating shows potential for developing long-lasting, self-cleaning and air-purifying construction materials.

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6

Buhl, Sebastian, J. Peter, A. Stich, R. Brückner, and C. Bulitta. "Durability and stability of antimicrobial coated surfaces." Current Directions in Biomedical Engineering 6, no. 3 (September 1, 2020): 298–300. http://dx.doi.org/10.1515/cdbme-2020-3076.

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AbstractAntimicrobial surface coating of i.e. medical devices could contribute to infection prevention and reduction of hospital acquired infections (HAI). Recent studies showed a significant reduction in the microbial contamination of antimicrobial coated surfaces in clinical setups. Nevertheless, there are only few publications available that deal with the durability and stability of these coatings under routine clinical conditions. In this work different antimicrobial coating compositions were tested on different surfaces for their durability and remaining antimicrobial activity. Our results show that the durability and stability of a subsequent applied antimicrobial coating is strongly dependent on the chemical formulation of the coating and also the underlying surface condition. Whereas we could still detect remaining antimicrobial coating and activity on some samples after repeated abrasion testing, some other samples lost their coating and activity after only a few abrasion cycles. Interestingly the integrated antimicrobial substance in the 3-D printed samples showed strong antimicrobial activity even after rough treatment of the surfaces (brushing, scratching).

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7

Lee, Kang N. "Key Durability Issues With Mullite-Based Environmental Barrier Coatings for Si-Based Ceramics." Journal of Engineering for Gas Turbines and Power 122, no. 4 (May 15, 2000): 632–36. http://dx.doi.org/10.1115/1.1287584.

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Plasma-sprayed mullite 3Al2O3s˙2SiO2 and mullite/yttria-stabilized-zirconia (YSZ) dual layer coatings have been developed to protect silicon-based ceramics from environmental attack. Mullite-based coating systems show excellent durability in air. However, in combustion environments, corrosive species such as molten salt or water vapor penetrate through cracks in the coating and attack the Si-based ceramics along the interface. Thus the modification of the coating system for enhanced crack-resistance is necessary for long-term durability in combustion environments. Other key durability issues include interfacial contamination and coating/substrate bonding. Interfacial contamination leads to enhanced oxidation and interfacial pore formation, while a weak coating/substrate bonding leads to rapid attack of the interface by corrosive species, both of which can cause a premature failure of the coating. Interfacial contamination can be minimized by limiting impurities in coating and substrate materials. The interface may be modified to improve the coating/substrate bond. [S0742-4795(00)03203-8]

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8

Kucharska, Beata, Paweł Czarniak, Krzysztof Kulikowski, Agnieszka Krawczyńska, Krzysztof Rożniatowski, Jerzy Kubacki, Karol Szymanowski, Peter Panjan, and Jerzy Robert Sobiecki. "Comparison Study of PVD Coatings: TiN/AlTiN, TiN and TiAlSiN Used in Wood Machining." Materials 15, no. 20 (October 14, 2022): 7159. http://dx.doi.org/10.3390/ma15207159.

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In this paper, we analyze the possibilities of the protection of tools for wood machining with PVD (Physical Vapor Deposition) hard coatings. The nanolayered TiN/AlTiN coating, nanocomposite TiAlSiN coatings, and single layer TiN coating were analyzed in order to use them for protection of tools for wood machining. Both nanostructured coatings were deposited in an industrial magnetron sputtering system on the cutting blades made of sintered carbide WC-Co, while TiN single layer coating was deposited by evaporation using thermionic arc. In the case of TiN/AlTiN nanolayer coatings the thickness of the individual TiN and AlTiN layer was in the 5–10 nm range, depending on the substrate vertical position. The microstructure and chemical composition of coatings were studied by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) method. Additionally, in the case of the TiN/AlTiN coating, which was characterized by the best durability characteristics, the transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS) methods were applied. The coatings adhesion to the substrate was analyzed by scratch test method combined with optical microscopy. Nano-hardness and durability tests were performed with uncoated and coated blades using chipboard. The best results durability characteristics were observed for TiN/AlTiN nanolayered coating. Performance tests of knives protected with TiN and TiAlSiN hard coatings did not show significantly better results compared to uncoated ones.

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9

Trajer, Marcin, Łukasz Pyclik, and Jerzy Robert Sobiecki. "The Nickel Aluminide Coatings Obtained on Small Holes Produced with the EDD Method." Strojniški vestnik - Journal of Mechanical Engineering 68, no. 10 (October 27, 2022): 623–34. http://dx.doi.org/10.5545/sv-jme.2022.169.

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Recently, airplane travel has become more affordable and thus more common. This has required engineers and scientists to spend thousands of hours on the development of new material and production technologies. High-pressure turbine (HPT) components are the most heavily loaded parts from the thermal, mechanical, and corrosion points of view. Therefore, both the material from which blades and vanes are cast as well as protective coatings are being constantly developed. Better material translates into longer and safer engine operation. Coatings maintain material structures within aggressive environments. However, despite the wide scope of development, there are areas that have not been investigated, one of which is electro-discharge drilling (EDD) machined cooling holes surface and its influence on environmental coating durability. In this paper, the EDD process impact on coating durability is shown. Process residuals, such as redeposited material and recast layers, result in coating inclusions. Oxidation testing also shows the relationship between the cooling hole diameter and coating durability.

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10

Zheng, Yan, Qian Jin Mao, Ya Li Wang, Zi Ming Wang, and Su Ping Cui. "Study on the Influence of Painting Processes on the Protective Property of Concrete Coating." Key Engineering Materials 509 (April 2012): 88–92. http://dx.doi.org/10.4028/www.scientific.net/kem.509.88.

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With the development of construction project the durability of concrete is becoming more and more prominent, and surface coating is an effective measure to enhance the durability of concrete. Water-based silicone acrylic emulsion coating and water-based fluorocarbon resin coating were chose as prime and topcoat respectively. The impact of the coating’s thickness and viscosity on the durability of concrete and the relationship between the viscosity of the coating and its penetration depth were testified by chloride ion permeability-resistance property of concrete. The results show that thickness is proportional to the protective performance of the coating, and the penetration depth highly depends on viscosity. And the result of coating-4 viscosity method shows that samples with viscosity between 15 and 25 seconds have better chloride permeability resistance.

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11

Chen, Xiao, Ren Yuan Zhang, and Feng Li. "Preparation and Performance of MoB/CoCr Coatings by LPPS on 20G Boiler Steel." Advanced Materials Research 201-203 (February 2011): 2623–29. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.2623.

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MoB/CoCr, a novel material for thermal spraying, with high durability in molten alloys is used to resist erosion by molten Al-Si alloy in solar thermal power generation. The microstructure and phase component of coatings were characterized, and the coatings were also studied on bond strength and thermal shock resistance. The durability of the MoB/CoCr coatings prepared by low pressure plasma spraying (LPPS) has been investigated using a molten-metal immersion tester. The results showed that phase component of powder and coating had little change. The coatings have dense structure and excellent combination with substrate. The main constituents of coatings remain invariant and the coatings have excellent properties of bond strength and thermal shock resistance. The immersion tests revealed that the MoB/CoCr coating has much higher durability without dissolution in the molten Al-12.07wt.%Si alloy.

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12

Mao, F. F., Changquan Li, T. C. Mao, Z. Y. Xue, G. Q. Xu, and A. Amirfazli. "Preparation and properties of a strong and durable composite superhydrophobic coating." Digest Journal of Nanomaterials and Biostructures 17, no. 4 (November 30, 2022): 1297–311. http://dx.doi.org/10.15251/djnb.2022.174.1297.

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In this paper, from the perspective of improving the durability of superhydrophobic coatings, a strong and durable superhydrophobic coating was prepared by a simple spray method. The coating has good chemical stability and mechanical durability. After soaking in aqueous solution with pH value of 1 and 14 for 30 hours and 24 hours respectively, the contact angle is 139.8 ° and 143.5 °respectively. After 90 times of abrasion, the contact angle is still 148 ° and the coating shows excellent self-cleaning and antifouling properties.

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13

Wang, Shuqiang, Yanpeng Xue, Yanyan Xue, Cunjing Lv, and Ying Jin. "Long-Term Durability of Robust Super-Hydrophobic Co–Ni-Based Coatings Produced by Electrochemical Deposition." Coatings 12, no. 2 (February 9, 2022): 222. http://dx.doi.org/10.3390/coatings12020222.

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The long-term durability for two kinds of Co–Ni-based robust coatings, the Co–Ni super-hydrophobic (Co–Ni SHPB) coating and Co–Ni/WC super-hydrophobic (Co–Ni/WC SHPB) coating, was analyzed through an immersion test in 3.5 wt.% NaCl solution. The evolution of their surface properties was characterized by scanning electron microscope (SEM) images, energy-dispersive spectrometry (EDS), a wettability measurement and X-ray photoelectron spectrometer (XPS), and the evolution of anti-corrosion mechanisms was evaluated with electrochemical measurements. The results show that as-prepared two kinds of robust coatings display a good long-term durability, with the Co–Ni SHPB coating and Co–Ni/WC SHPB coating losing their super-hydrophobicity after being immersed for more than 10 days. Additionally, both kinds of coatings present efficient corrosion protection even after long-term immersion.

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14

Ramazanov, K. N., E. L. Vardanyan, V. R. Mukhamadeev, A. Yu Nazarov, I. R. Mukhamadeev, and A. A. Nikolaev. "The study of influence of the reaction gases ratio at the Ti–Al–C–N coating deposition on the cutting tool wear resistance." Frontier materials & technologies, no. 3 (2022): 32–43. http://dx.doi.org/10.18323/2782-4039-2022-3-2-32-43.

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The paper presents the results of the study of the component composition of the reaction gases mixture when synthesizing carbonitride coatings of the Ti–Al–C–N system influencing the cutting tool durability. The coating was applied using the updated unit NNV-6.6-I1 by spraying from two one-component cathodes assisted by the incandescent cathode plasma source. During applying the coating, the mixture of reaction gases of N2 nitrogen and C2H2 acetylene in the ratio of 1:4, 2:3, 3:2, and 4:1 was delivered to the chamber. The paper presents the results of measuring the microhardness of studied specimens, which show that a sample with the coating deposited at the reaction gases ratio of N2:C2H2=2:3 had the largest microhardness value (4870 HV0.05). The paper presents the results of field tests of carbide-tipped tools with the studied coatings. Durability tests identified that a cutter with the coating deposited at the gas ratio of N2:C2H2=4:1 increases the tool durability ten times compared to a cutting tool without coating. Using the electron microscopy method, the authors investigated the chemical composition of the tool cutting face after tests. The analysis of the chemical composition of the surface after cutting showed that the content of coating elements on the surface of the sample with a coating deposited at the 4:1 ratio of the reaction gases of nitrogen and acetylene was considerably higher than that of other studied coatings, which indicates the less coating wear. However, ferrum is present in some areas of the cutting face, which says about the adhesion of treated material to the tool.

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15

Vulic, Tatjana, Snezana Vucetic, Bojan Miljevic, and Jonjaua Ranogajec. "Novel photocatalytic coating on façade paints: Functional properties and durability." Acta Periodica Technologica, no. 49 (2018): 181–91. http://dx.doi.org/10.2298/apt1849181v.

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The negative influence of the environmental pollutants on building materials used for fa?ades could be minimized by applying protective photocatalytic coatings with selfcleaning properties. Novel inorganic-inorganic nanocomposite photocatalytic coating based on TiO2/Zn-Al layered double hydroxides (LDHs) was applied on commercial fa?ade paint and the functional properties (photocatalytic activity and surface properties) were studied before and after durability tests towards the adhesion of the coating. The results showed that the TiO2/ZnAl LDH based coating did not influence esthetic appearance, surface roughness and microhardness of the fa?ade paints. The coating demonstrated a significant photocatalytic activity and the photo-induced hydrophilicity, enabling the self-cleaning effect. The study of the influence of temperature and relative humidity on photocatalytic activity indicated that optimal weather conditions for the application of coating precursors onto the fa?ade paints are in the spring and in autumn seasons.

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16

Queant, Caroline, Pierre Blanchet, Véronic Landry, and Diane Schorr. "Effect of Adding UV Absorbers Embedded in Carbonate Calcium Templates Covered with Light Responsive Polymer into a Clear Wood Coating." Coatings 8, no. 8 (July 28, 2018): 265. http://dx.doi.org/10.3390/coatings8080265.

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The limited durability of clear coatings is a major issue for the coating and wood industry. The addition of organic UV absorbers improves coating resistance by the absorption and the conversion of the UV radiation into harmless heat. Organic UVAs are prone to degradation and can migrate in the binder of coatings. In this study, commercial UVAs and HALS have been entrapped into CaCO3 templates coated with stimuli responsive polymers. Microspheres were incorporated into a clear acrylic water-based coating formulation. The formulation was applied on glass and wood panels and was placed into an artificial UV chamber. This study presents a comparison between the aesthetic behavior of coating formulations with free and encapsulated commercial UVAs and HALS during the accelerated ageing test. Encapsulation of UVAs was confirmed by XPS and TGA analysis. Results have shown that the coating’s aesthetic was slightly improved when using the encapsulated products.

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17

Pánek, Miloš, Ondřej Dvořák, Eliška Oberhofnerová, Kristýna Šimůnková, and Aleš Zeidler. "Effectiveness of Two Different Hydrophobic Topcoats for Increasing of Durability of Exterior Coating Systems on Oak Wood." Coatings 9, no. 5 (April 26, 2019): 280. http://dx.doi.org/10.3390/coatings9050280.

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A top hydrophobic layer can increase the durability of exterior coatings applied on wood. Two hydrophobic topcoats - synthetics and waterborne acrylate resin with wax additives, were tested as top layers on twenty-four different coating systems applied on oak wood in this experiment. Artificial accelerated weathering lasted for six weeks. Changes of color, gloss, surface wetting were evaluated, and microscopic analyses of coated surfaces were done during weathering. The results have shown that a top hydrophobic layer increases the durability of tested coating systems in most cases. However, the effectiveness of the two tested hydrophobic topcoats turned out to be different depending on the specific coating systems used.

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18

Arzumanova, A. V., A. V. Starunov, and K. A. Shpanova. "Wear Resistance of a Composite Galvanic Coating Based on the Nickel-Cobalt Alloy." Materials Science Forum 945 (February 2019): 735–39. http://dx.doi.org/10.4028/www.scientific.net/msf.945.735.

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In modern engineering the great attention is paid to the creation and implementation of new electroplating coating to ensure the durability, hardness and corrosion resistance. One of the effective methods for improving the properties of composite coatings is the method of galvanic deposition. The principle of obtaining of the composite electroplating was based on the fact that together with the metals ion some disperse particles of different sizes and nature are co-deposited. By including into metal matrix the particles are improve the performance coatings and increase the reliability and durability of products. The chloride electrolyte for application of the wear-resistant composite galvanic coating of nickel-cobalt-silicon oxide system was designed. The influences of the electrolysis modes and the electrolyte composition to a physical mechanical properties of the coating (wear resistance, firmness to corrosion, micro-hardness, internal stress, porosity, adhesion) were investigated. The possibility of the usage of received coating as the firmness to corrosion material with anti-frictional properties was showed.

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19

Pánek, Hýsek, Dvořák, Zeidler, Oberhofnerová, Šimůnková, and Šedivka. "Durability of the Exterior Transparent Coatings on Nano-Photostabilized English Oak Wood and Possibility of Its Prediction before Artificial Accelerated Weathering." Nanomaterials 9, no. 11 (November 5, 2019): 1568. http://dx.doi.org/10.3390/nano9111568.

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Changes in surface material characteristics can significantly affect the adhesion and overall life of coatings on wood. In order to increase the durability of transparent exterior coatings, it is possible to use the surface modification of wood with UV-stabilizing substances. In this work, selected types of surface modifications using benzotriazoles, HALS, ZnO and TiO2 nanoparticles, and their combinations were applied to oak wood (Quercus robur, L.). On such modified surfaces, the surface free energy, roughness, and contact wetting angle with three selected types of exterior transparent coatings were subsequently determined. An oil-based coating, waterborne acrylic thick layer coating, and thin-layer synthetic coating were tested and interaction with the aforementioned surface modifications was investigated after 6 weeks of accelerated artificial weathering. The results of changes in the initially measured surface characteristics of the modified oak wood were compared to the real results of degradation of coatings after artificial accelerated weathering. The positive effect of surface modification, in particular the mixture of benzotriazoles, HALS, and ZnO nanoparticles on all kinds of coatings was proven, and the best results were observed in thick-film waterborne acrylic coating. The changes in the measured surface characteristics corresponded to the observed durability of the coatings only when measured by wetting using drops of the tested coatings.

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Bobrovskij, I. N., S. N. Grigoriev, P. A. Melnikov, and N. M. Bobrovskij. "Research of Hardalloyed Burnishing Tool Durability with Coatings by Ion-Plasmous Sputtering Method." Applied Mechanics and Materials 770 (June 2015): 274–78. http://dx.doi.org/10.4028/www.scientific.net/amm.770.274.

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In this paper the effect of different types of coatings on durability increase of the tool for surface plastic deformation is considered. Wide burnishing processing with coated tool was selected as such research was performed for the first time. The influence of the type of coating on the tool durability has been explored.

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21

Maj, Marek, Andrzej Ubysz, and Ashot Tamrazyan. "Durability of polyurethane - cement floors." MATEC Web of Conferences 251 (2018): 02026. http://dx.doi.org/10.1051/matecconf/201825102026.

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The products covered by the common name polyurea were first developed and marketed in the United States in the 1980’s In the first period polyurea was used as a protective coating of polyurethane foam used for thermal insulation of roofs, and in the 1990s many other uses were quickly disseminated. In Europe this technology appeared in the second half of the nineties and the market for polyurea applications started to develop very dynamically in the recent years. Polyurea coatings, due to their extremely versatile physical properties such as watertightness, extremely high wear resistance, resistance to chemical and mechanical stresses, high elasticity and stretchability as well as resistance to freeze-thaw cycles, are increasingly popular, and more and more frequently used in the broadly understood construction. As a rule, the growing demand for technology fosters its development and enhances the knowledge of those who use it, so that it is used for its intended purpose, while maintaining security and enforcement procedures. However, in the absence of such knowledge, misconceptions about the use of polyurea spray coating technologies are emerging, both at the design stage and during the execution phase.

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22

Weththimuni, Maduka L., Marwa Ben Chobba, Donatella Sacchi, Mouna Messaoud, and Maurizio Licchelli. "Durable Polymer Coatings: A Comparative Study of PDMS-Based Nanocomposites as Protective Coatings for Stone Materials." Chemistry 4, no. 1 (January 29, 2022): 60–76. http://dx.doi.org/10.3390/chemistry4010006.

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Nowadays, durable protective coatings receive more attention in the field of conservation for several reasons (they are cost effective, time consuming, more resistance, etc.). Hence, this study was focused on producing a multi-functional, durable coating to protect different stone materials, especially, Lecce stone, bricks, and marble. For this purpose, ZrO2-doped-ZnO-PDMS nanocomposites (PDMS, polydimethylsiloxane used as the binder) were synthesized by in situ reaction (doped nanoparticles were inserted into the polymer matrix during the synthesis of PDMS) and the performances of resulting coatings were examined by handling different experimental analyses. In particular, the study aimed to evaluate the durability properties of the coating along with the self-cleaning effect. As a result, the durability of the nanocomposite coating with respect to the well-known PDMS coating was assessed after exposure to two different ageing cycles: solar ageing (300 W, 1000 h) and humid chamber ageing (RH > 80%, T = 22 ± 3 °C, desiccator, 2 years). All the results were in good agreement with each other providing that newly prepared nanocomposite coating can be used as a durable protective coating for different stone materials.

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23

Mauger, Scott A., Sanghun Lee, Elliot Padgett, Sunilkumar Khandavalli, Genevieve Stelmacovich, Tobias Schuler, Shaun M. Alia, Svitlana Pylypenko, and Michael Ulsh. "Fabrication, Performance, and Durability of Roll-to-Roll Coated Iridium-Based Anodes." ECS Meeting Abstracts MA2022-02, no. 44 (October 9, 2022): 1656. http://dx.doi.org/10.1149/ma2022-02441656mtgabs.

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To reduce hydrogen production costs for low temperature water electrolysers to meet the Hydrogen Shot goal of $1/kg manufacturing methods need to be translated from batch to continuous processes. For production of IrO2 anode layers, roll-to-roll (R2R) methods are well suited due to their potential for high throughput and uniformity. There are a variety of coating methods for R2R, each with their own operating limitations such as coating fluid viscosity and liquid film thickness. For any coating method there will be a region of operating conditions, known as the coating window, where stable coatings can be obtained. Related to this is the ink formulation and its solids (catalyst and ionomer) concentration which influences its viscosity and determines the required liquid film thickness to achieve a specified target loading. Increasing solids concentration is desirable to reduce solvent content enabling reduced dryer loads and/or increased line speeds. However, this reduces the liquid film thickness, potentially to values outside the coating window. To better understand the relationship between coating method and formulation we conducted a study exploring the range of Ir loadings attainable with different formulations and coating methods. Catalyst inks were formulated with 10, 20, and 30 wt% IrO2 with a fixed I:Cat ratio of 0.2. Slot die and gravure coating were used to coat the catalyst layers onto a decal substrate at a variety of loadings ranging from 0.06 mgIr/cm2 to 0.65 mgIr/cm2. Slot coating produced uniform coatings with 20 and 30 wt% IrO2 inks but the low viscosity of the 10 wt% IrO2 ink resulted in poor control of coating width and uniformity. In contrast gravure coating was able to produce uniform coatings with all formulations due to it being better suited for low viscosity fluids. For coatings within the coating window the catalyst layers had high uniformity with loading variations below 10%. However, optical and scanning electron microscopy revealed microscale heterogeneity of the catalyst layers with low loaded catalyst layers (< 0.2 mgIr/cm2) appearing to have voids in the coating. MEAs were fabricated from these R2R-coated catalyst layers for comparison to spray-coated catalyst layers. These MEAs were tested for both performance and durability. R2R-catalyst layers with 0.4 mgIr/cm2 had identical initial performance compared to spray-coated catalyst layers. In contrast, R2R-coated CLs with 0.2 mgIr/cm2 performed significantly worse than spray-coated catalyst layers, likely due to the heterogeneities. These results illuminate the challenges in moving towards very low catalyst loadings. Results will also be presented on efforts to improve the homogeneity catalyst layers at 0.2 mgIr/cm2 through changes in ink formulation and processing. This work was authored in part by the National Renewable Energy Laboratory, operated by Alliance for Sustainable Energy, LLC, for the U.S. Department of Energy (DOE) under Contract No. DE-AC36-08GO28308. Funding provided by U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Hydrogen and Fuel Cells Technology Office. The views expressed in the article do not necessarily represent the views of the DOE or the U.S. Government. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for U.S. Government purposes.

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Kong, Xiaoli, Bo Zhou, Jixiao Wang, and Wenping Li. "Engineering research of DLC coating in piston pins and bucket tappets." Industrial Lubrication and Tribology 68, no. 5 (August 8, 2016): 530–35. http://dx.doi.org/10.1108/ilt-09-2015-0132.

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Purpose The purpose of this paper is to study the engineering application of diamond like carbon (DLC) coatings on the surfaces of piston pins and bucket tappets for a 2.0 L supercharged gasoline engine. The friction loss and durability of DLC-coated components were investigated. Design/methodology/approach The tribological characteristics were examined under oil-lubricated conditions in a CETR UMT reciprocating tribometer. In a motored engine test rig, friction loss torque test was performed to estimate the improvement in fuel economy. Fired engine durability bench tests of typical duration of 450 h were completed to access the durability and wear resistance of DLC coating. Before and after durability tests, coated and uncoated components were measured on the sliding surface by a profilometer technique. Findings Friction and wear test results show that DLC coating has low friction coefficient and reduces the wear rates by almost ten times compared to those of uncoated surfaces. Friction loss measurements indicate that DLC-coated tappets can reduce valve train friction loss by 29 per cent, and DLC-coated piston pins can reduce piston group friction by 11 per cent. Based on fired engine durability bench tests, it is evidenced that none of the coated tappets and pins show any noticeable peeling or delamination. Wear profiles analysis results indicate that DLC-coated engine components give rise to a substantial reduction in wear. Originality/value DLC coating applied onto the working surface of piston pin and bucket tappet can effectively reduce the friction loss of gasoline engine. DLC coating exhibits sufficient durability and improves friction and wear performance.

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Zhang, Peng, Wenshuai Wang, Yajun Lv, Zhen Gao, and Siyuan Dai. "Effect of Polymer Coatings on the Permeability and Chloride Ion Penetration Resistances of Nano-Particles and Fibers-Modified Cementitious Composites." Polymers 14, no. 16 (August 10, 2022): 3258. http://dx.doi.org/10.3390/polym14163258.

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Nano-particles and fibers-modified cementitious composite (NFCC) can greatly overcome the shortcomings of traditional cementitious materials, such as high brittleness and low toughness, and improve the durability of the composite, which in turn increases the service life of the structures. Additionally, the polymer coatings covering the surface of the composite can exert a good physical shielding effect on the external water, ions, and gases, so as to improve the permeability and chloride ion penetration resistance of the composite. In this study, the effect of three types of polymer coatings on the water contact angle, permeability resistance, and chloride ion penetration resistance of the NFCC with varied water–binder ratios were investigated. Three kinds of polymers (chlorinated rubber coating, polyurethane coating, and silane coating) were applied in two types of coatings, including single-layer and double-layer coatings. Three water–binder ratios of 35 wt.%, 40 wt.%, and 45 wt.% were used for the NFCC. The research results revealed that the surface of the NFCC treated with polymer coatings exhibited excellent hydrophobicity. The permeability height and chloride diffusion coefficient of the NFCC coated with different types of polymer coatings were 31–48% and 36–47% lower, respectively, than those of the NFCC without polymer coatings. The durability of the NFCC was further improved when the polymer coatings were applied to the surface in two-layer. Furthermore, it was discovered that increasing the water–binder ratio of the NFCC would lessen the positive impact of polymer coatings on the durability of NFCC.

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NOMURA, Hirorou. "PVD Coating for Die and Durability of PVD Coating." Journal of the Japan Society for Technology of Plasticity 56, no. 650 (2015): 171–75. http://dx.doi.org/10.9773/sosei.56.171.

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TANIGUCHI, Jun, Noriyuki UNNO, Yasuo KOGO, and Masaru TAKAHASHI. "1301 Durability of DLC Release Coating in Ultraviolet Nanoimprint Lithography." Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2015.8 (2015): _1301–1_—_1301–2_. http://dx.doi.org/10.1299/jsmelem.2015.8._1301-1_.

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Rehfeld, Nadine, Björn Speckmann, Claus Schreiner, and Volkmar Stenzel. "Assessment of Icephobic Coatings—How Can We Monitor Performance Durability?" Coatings 11, no. 6 (May 21, 2021): 614. http://dx.doi.org/10.3390/coatings11060614.

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Significant progress in the field of icephobic coatings has raised a demand for evaluation criteria to assess and monitor the related icephobic effects and their durability. The initial coating performance in preventing ice formation and reducing ice adhesion needs to be proven over a given period by withstanding technically relevant stressors. In this study, silanized polyurethane (PUR) coatings are assessed in conjunction with a standardized accelerated ultraviolet (UV)-ageing procedure in order to identify potential monitoring tools that are also applicable during in-service inspections. Wettability and roughness parameters are recorded after pre-defined ageing intervals, compared with the ice adhesion strength, and tested using a modified centrifuge. Correlation assessments indicate that the chosen parameters cannot generally be used for the monitoring of icephobic effects for the selected material class. It is more likely that specific coating parameter sets need to be defined for in-service monitoring, as an important step towards the integration of icephobic coatings into technical applications.

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Kuczmaszewski, Józef, Paweł Pieśko, and Magdalena Zawada-Michałowska. "Carbide Milling Cutter Blades Durability during Machining of AL-SI Casting Alloy." Multidisciplinary Aspects of Production Engineering 1, no. 1 (September 1, 2018): 169–75. http://dx.doi.org/10.2478/mape-2018-0022.

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Abstract The paper presents results of wear measurements of carbide shank milling cutters during machining of AlSi10Mg casting alloy. The comparison was made between blades wear of milling cutters without protective coating, with TiB2 coating, and with TiAlCN coating. All cutters had identical geometry dedicated to milling of materials of ISO N group. To assess blades wear degree, measurement of two direct indicators, i.e. VBC and VBBmax, and one indirect indicator, i.e. machined surfaces roughness, were used. Received results allowed to determine usefulness of using selected protective coatings in machining of aluminium alloys, especially Al-Si casting alloys.

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Oberhofnerová, Eliška, Kristýna Šimůnková, Ondřej Dvořák, Irena Štěrbová, Salim Hiziroglu, Přemysl Šedivka, and Miloš Pánek. "Comparison of Exterior Coatings Applied to Oak Wood as a Function of Natural and Artificial Weathering Exposure." Coatings 9, no. 12 (December 16, 2019): 864. http://dx.doi.org/10.3390/coatings9120864.

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Artificial weathering can significantly reduce the testing time needed for proving coating durability, nevertheless its reliability is still not thoroughly proven. In this study, eight different transparent and pigmented coating systems, namely oil, acrylate, alkyd and urethane alkyd were evaluated through natural and artificial weathering tests on oak samples by measuring colour, gloss and surface wettability and by macroscopic and microscopic evaluation. The oil coatings performed well in wood colour stability evaluations, while the best gloss and wettability change results were noted for acrylate coatings. Pigmented coatings were characterized by significantly lower colour changes than transparent ones. The gloss and wettability changes were more sensitive to coating disruption than to total colour changes of coated wood associated with chemical changes in wood. The findings in this work showed that values of gloss changes and surface wettability for all types of coatings exposed to artificial and natural weathering resulted in significant differences from each other. The data obtained by artificial weathering method provide basic results of coatings durability and, ideally, natural weathering should be performed at the same time to support the results from laboratory tests by exposing wood under real conditions.

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Kim, Sang Youl, Han-Seung Lee, and Jin-Ho Park. "Deposition of Different Metallic Coatings as Repair Materials for Concrete by Using a Twin-Wire Arc Thermal Spray Process." Applied Sciences 12, no. 23 (November 22, 2022): 11874. http://dx.doi.org/10.3390/app122311874.

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Using a concrete surface, the ingress of aggressive ions and the initiation of the corrosion reaction of an embedded steel rebar were studied. To reduce the corrosion reaction of the embedded steel rebar, either a coating on the steel rebar or a repair material was used on the concrete surface. Therefore, in the present study, 200 µm thick Cu, Ti, and 85Zn-15Al were used as repair materials, and their coatings were deposited on the concrete surface using a twin-wire arc thermal spray process. Different experiments such as bond adhesion, water permeability, immersion in a 5 wt.% NaCl solution, and accelerated carbonation were performed to assess the durability of the coatings, and the characterization of the coatings was performed by using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The Cu and 85Zn-15Al coatings exhibited severe defects and porosity; therefore, these coatings exhibited very low bond adhesion, whereas the Ti coating showed a dense and compact morphology, and its bond adhesion value was 11 times greater than that of the Cu coating. The NaCl immersion results can be used to determine the extent of the deterioration of different coatings in coastal areas; based on these results, the Cu coating exhibited delamination, while 85Zn-15Al showed white rust deposition. By contrast, there was no detrimental effect of NaCl immersion on the Ti coating during the 28 days under study, and the coating exhibited characteristics identical to those observed after deposition. The Ti coating reduced the carbonation depth by 1.5–2 times that of the Cu and 85Zn-15Al coatings after four and eight weeks of exposure. The present study suggests that Ti can be the potential metal used as a repair material for concrete to enhance the durability of buildings and infrastructure.

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Li, Yue, Chunchun Wu, Ming Xue, Jiawen Cai, Yi Huang, and Hui Yang. "Preparation of Sol-Gel Derived Anticorrosive Coating on Q235 Carbon Steel Substrate with Long-Term Corrosion Prevention Durability." Materials 12, no. 12 (June 18, 2019): 1960. http://dx.doi.org/10.3390/ma12121960.

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Anticorrosive coatings prepared by sol-gel derived approaches have become an emergent research area in the field of corrosion prevention materials. Furthermore, enhanced coating thickness can greatly improve the barrier effect of the sol-gel coatings, thus influencing their service life in industrial applications. Here, we propose the preparation of a two-layer coating system using a low-cost sol-gel derived method. The coating structure was composed of first an underlying layer incorporated with silica and titania powder as filler and pigment materials, and a second translucent topcoat containing a colloidal silica sol-gel matrix crosslinked by methyltrimethoxysilane (MTMS). This coating system was applied on Q235 carbon steel substrate by a two-step spray deposition method, resulting in an enhanced coating thickness of around 35 μm. The physical and morphological properties of the coatings were characterized using multiple techniques, including scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and atomic force microscopy (AFM). The anticorrosion performance of the sol-gel coatings was studied by a salt spray test, outdoor exposure test and electrochemical impedance spectroscopy (EIS). Results revealed that this two-layer coating system exhibited excellent physical and anticorrosion properties, and that the topcoat played a crucial role in maintaining the barrier effect and preventing water leakage.

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Hong, Tianzeng, Yabin Wang, Xueying Nai, Yaping Dong, Xin Liu, and Wu Li. "Surface modification of anhydrite whiskers and their potential application for durable superhydrophobic coatings." RSC Advances 7, no. 84 (2017): 53301–5. http://dx.doi.org/10.1039/c7ra10908c.

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In this paper a simple method is provided to solve the durability problem of superhydrophobic coatings. Using a traditional approach we give new functions to anhydrite whiskers in the superhydrophobic coating field.

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Chen, Qian, Chaohui Wang, Hao Fu, and Lian Zhang. "Durability evaluation of road cooling coating." Construction and Building Materials 190 (November 2018): 13–23. http://dx.doi.org/10.1016/j.conbuildmat.2018.09.071.

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35

Zhao, Fujun, Hengjing Ba, and Xiaojian Gao. "The durability of epoxy resin coating." Journal of Wuhan University of Technology-Mater. Sci. Ed. 23, no. 2 (April 2008): 242–44. http://dx.doi.org/10.1007/s11595-006-2242-z.

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36

Bauer, David R. "Predicting coating durability using chemical methods." Progress in Organic Coatings 23, no. 2 (December 1993): 105–14. http://dx.doi.org/10.1016/0033-0655(93)80007-w.

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Matviychuk, Viktor, and Oleg Gaidamak. "INCREASING THE DURABILITY OF DETAILS TO WORK UNDER REPEATABLE LOADS." Vibrations in engineering and technology, no. 3(98) (October 30, 2020): 15–24. http://dx.doi.org/10.37128/2306-8744-2020-3-2.

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The article presents the results of the development of processes to improve the performance of parts operating under repeated variable loads, taking into account the reasonable parameters of surface plastic deformation (SPD) and cold gas-dynamic spraying of coatings. The influence on the parameters of the working surface layer, the nature of the distribution of the stress-strain state of the surface layer of material and residual compressive stresses, as well as the values of the used resource of plasticity of the surface layer of the workpiece, the parameters of the SPD process. The article shows that the main factor in the formation of residual compressive stresses during SPD is the decrease in the density of the surface layer of the workpiece, which is associated with the use of the plasticity resource. The model of calculation of the used resource of plasticity of material of preparation at SPD which allows to provide the improved quality of a surface layer of details is offered. A method of moving the workpiece layers with maximum hardening and residual compression stresses to the surface of the part by applying a deforming tool of reduced size in the following passes with coating the surface of the part with gas-dynamic spraying before SPD. Cold gas-dynamic coating by spraying, in contrast to most known gas-thermal coating methods that take place under significant temperature effects on the surface of the part, which is unacceptable for surfaces treated by SPD methods, provides a permissible temperature regime for creating special auxiliary coatings while preserving surface properties SPD. The technology of gas-dynamic coating by spraying includes heating the compressed gas (air), directing it into the nozzle and forming in this nozzle supersonic air-powder flow, sprayed material (copper, aluminum), acceleration of this powder material to supersonic speeds and directing it to the surface of the processed product. As a result, a special auxiliary coating (copper or aluminum) is formed on the surface of the product, which improves the parameters of the SPD process.

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Staszuk, M., L. A. Dobrzanski, T. Tanski, W. Kwasny, and M. Musztyfaga-Staszuk. "The Effect of PVD and CVD Coating Structures on the Durability of Sintered Cutting Edges." Archives of Metallurgy and Materials 59, no. 1 (March 1, 2014): 269–74. http://dx.doi.org/10.2478/amm-2014-0044.

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Abstract In the work it was demonstrated that the exploitative stability of edges from tool ceramics and sintered carbides coated with gradient and multilayer PVD and CVD coatings depends mainly on the adherence of the coatings to the substrate, while the change of coating microhardness from 2300 to 3500 HV0.05, the size of grains and their thickness affect the durability of the edges to a lesser extent. It was found that some coatings showed a fine-grained structure. The coatings which contained the AlN phase with hexagonal lattice showed a considerably higher adhesion to the substrate from sialon ceramics rather than the coatings containing the TiN phase. Better adherence of the coatings containing the AlN phase with hexagonal lattice is connected with the same kind of interatomic bonds (covalent) in material of both coating and ceramic substrate. In the paper the exploitative properties of the investigated coatings in the technological cutting trials were also determined. The models of artificial neural network, which demonstrate a relationships between the edge stability and coating properties such as: critical load, microhardness, thickness and size of grains were worked out.

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Benetti, Giulio, Emanuele Cavaliere, Francesco Banfi, and Luca Gavioli. "Antimicrobial Nanostructured Coatings: A Gas Phase Deposition and Magnetron Sputtering Perspective." Materials 13, no. 3 (February 8, 2020): 784. http://dx.doi.org/10.3390/ma13030784.

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Counteracting the spreading of multi-drug-resistant pathogens, taking place through surface-mediated cross-contamination, is amongst the higher priorities in public health policies. For these reason an appropriate design of antimicrobial nanostructured coatings may allow to exploit different antimicrobial mechanisms pathways, to be specifically activated by tailoring the coatings composition and morphology. Furthermore, their mechanical properties are of the utmost importance in view of the antimicrobial surface durability. Indeed, the coating properties might be tuned differently according to the specific synthesis method. The present review focuses on nanoparticle based bactericidal coatings obtained via magneton-spattering and supersonic cluster beam deposition. The bacteria–NP interaction mechanisms are first reviewed, thus making clear the requirements that a nanoparticle-based film should meet in order to serve as a bactericidal coating. Paradigmatic examples of coatings, obtained by magnetron sputtering and supersonic cluster beam deposition, are discussed. The emphasis is on widening the bactericidal spectrum so as to be effective both against gram-positive and gram-negative bacteria, while ensuring a good adhesion to a variety of substrates and mechanical durability. It is discussed how this goal may be achieved combining different elements into the coating.

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Chen, Huang, Soo Wohn Lee, and Bo Young Hur. "Influence of Deposition Parameters on Adhesion/Cohesion of Plasma Sprayed TiO₂ Coatings." Materials Science Forum 510-511 (March 2006): 62–65. http://dx.doi.org/10.4028/www.scientific.net/msf.510-511.62.

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Adhesion/cohesion is one of the most important properties for coatings. It is related with their durability and functionality of coatings. In this study, a series of TiO2 coatings were prepared by atmosphere plasma spraying under different deposition parameters. Their adhesion or cohesion was evaluated as a function of coating thickness as well as deposition parameters using the scratch test. In addition, the influence of deposition parameters on coating porosity, surface roughness, and microhardness is discussed. The results indicate that the deposition parameters investigated have a remarkable influence on coating porosity and microhardness as well as adhesion or cohesion, but no obvious influence was observed for surface roughness.

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Xie, Wei Hong, Nan Zhou, Shun Cai Li, and Guo Bao. "Experiment Research on the Surface Tension and Contact Angle of Modified Camouflage Coating." Advanced Materials Research 486 (March 2012): 221–26. http://dx.doi.org/10.4028/www.scientific.net/amr.486.221.

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In thisexperiment, nanoCaCO3, nanoSiO2, nanoTiO2and nanoZnO were chosen and added into waterborne camouflage coating respectively to make nanomaterial camouflage coatings. Both the surface tension and the contact angle of the coating (on steel plate and on concrete blocks) were measured by the OCA15+ video optics contact angle admeasuring apparatus; the nanomaterials influence on the interfacial properties of camouflage coating were studied based on its changing concentration. The experiment indicates that the relationship between the concentration of nanomaterial and the surface tension of the coating coincides with the Szyszkowski formula, but only when the concentration is relatively low; nanoSiO2has the best effect in improving the interfacial properties of camouflage coatings. It also proves that adding proper nanomaterial is an efficient way to improve the coatings durability.

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42

Wang, Ruosong, Huaqiao Tan, Zhao Zhao, Guoqiang Zhang, Laiwen Song, Wenfei Dong, and Zaicheng Sun. "Stable ZnO@TiO2 core/shell nanorod arrays with exposed high energy facets for self-cleaning coatings with anti-reflective properties." J. Mater. Chem. A 2, no. 20 (2014): 7313–18. http://dx.doi.org/10.1039/c4ta00455h.

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ZnO@TiO₂ nanorod arrays thin film coatings on an FTO substrate were made via a hydrothermal route. The coating exhibits good transparency and hydrophilic properties, exhibiting very good photocatalytic activity and durability.

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Borowski, Jacek, Tomasz Rybak, Mikhail Ignatiev, Hanna Wiśniewska-Weinert, Igor Dobrovnik, and Volf Leshchynsky. "Nanocomposite PVD Coatings Applied to Cold Plastic Forming Tools." Materials Science Forum 674 (February 2011): 105–12. http://dx.doi.org/10.4028/www.scientific.net/msf.674.105.

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Cold forging tools most often fail as a result of wearing down surface layer which works with forming part. Deposition of a hard coating on the working surface is widely applied to increase tool durability. In this respect technologies of production of top layers with the use of nanocomposite materials provide great opportunities of modification of tribological properties. This paper presents results of metallographic, SEM and HRTEM analysis of PVD nanocomposite coatings [1] (nACVIc, TiCN-CBC and TiCN-NP-MOVIC). The tribological tests with ball on disc (T10) tester and industrial tests of forging tool durability were made. The multilayer nACVIc coating is composed of thin layers with the thickness of approximately 2nm as structured alternately by Al and Ti,N,Si atoms, that is different from TiCN-CBC coating with column structure. A modification of the structure results in change of tribological behavior. The nACVIc nanocomposite coating is characterized by significantly less value of the friction coefficient (0.2) as compared to TiCN-CBC coating (0.7) under the same test conditions.

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Li, Fengqin, Yong Liu, Honggen Zhou, and Guizhong Tian. "Preparation and Evaluation of PDMS/Carbon Soot Particles Superhydrophobic Biomimetic Composite Coating with Self-Cleaning and Durability." Biomimetics 7, no. 3 (September 13, 2022): 132. http://dx.doi.org/10.3390/biomimetics7030132.

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In this paper, a superhydrophobic biomimetic composite coating was fabricated on brass by electrochemical etching, brushing PDMS adhesive layer, and depositing carbon soot particles. Due to the microstructure and the optimized ratio of PDMS, the contact angle of the superhydrophobic coating is up to 164° and the sliding angle is only 5°. The results of optical microscopy and morphometric laser confocal microscopy show that the prepared coating surface has a rough hierarchical structure. A high-speed digital camera recorded the droplet bouncing process on the surface of the superhydrophobic coating. The self-cleaning property of the coatings was evaluated by applying chalk dust particles as simulated solid contaminants and different kinds of liquids (including grape juice, beer, cola, and blue ink) as liquid contaminants. The coating remained superhydrophobic after physical and chemical damage tests. This work presents a strategy for fabricating superhydrophobic biomimetic composite coatings with significant self-cleaning properties, durability, and shows great potential for practical engineering applications.

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45

Kovalenko, I. A., D. V. Laskin та A. Y. Trifonova. "The Impact of Zinc Coating Specifications on Corrosion Resistance аnd Durability of Steels". Materials Science Forum 945 (лютий 2019): 740–45. http://dx.doi.org/10.4028/www.scientific.net/msf.945.740.

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The article contains the findings on impact of zinc coating specifications on corrosion resistance and service life of steels of various chemical composition used often in modern industries. Characteristics such as type, class, chemical compound and thickness of zinc-based coatings are also addressed. Experiments were performed in which corrosion rate and useful life of zinc coatings in probable operating-like conditions — i.e., in environments of varying degrees of corrosive power (humid and high-chloride environments) were determined. It has been established which one of the environments is the most corrosive for steels depending on the zinc-based coatings’ specifications. Qualitative (visual) and quantitative (gravimetric) assessment of corrosion resistance and service life of chosen steels is presented. Optimal hot dip galvanized coating specifications were determined using statistical analysis.

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46

Czarniak, Paweł, Karol Szymanowski, and Peter Panjan. "Characteristic of the wear of a tool coating based on amorphous carbon during chipboard milling." Annals of WULS, Forestry and Wood Technology 111 (September 30, 2020): 53–59. http://dx.doi.org/10.5604/01.3001.0014.6652.

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Characteristic of the wear of a tool coating based on amorphous carbon during chipboard milling. The study verified the durability and the course of wear during the durability tests of the TiAlN / a-C:N double tool coating. The aforementioned coating consisted of a bottom layer of TiAlN and a top layer based on nitrogenenriched amorphous carbon. Standard replaceable cutters for milling heads made of WC-Co sintered carbide were subjected to the modification process. The coating was applied using plasma by RF Magnetron Sputtering. During the tests, the blade wear was measured using a workshop microscope. The VB max indicator measured on the clearance face was adopted as the blunting criterion and its maximum value was set on 0,2 mm. The results show that the additional coating of amorphous carbon contributed to the increase of the tool durability determined with cutting distance. The use of only a single layer based on TiAlN shortened the durability by about 3%. On the other hand, applying both the bottom and top layers TiAlN /a-C:N) extended the cutting distance by about 24%. The research showed a clear advantage in terms of the durability of the blades modified with a multi-layer coating in relation to a single-layer. Moreover, the positive effect of the top layer containing amorphous carbon on tool durability has been demonstrated.

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Bhushan, Bharat, and Victor Multanen. "Designing liquid repellent, icephobic and self-cleaning surfaces with high mechanical and chemical durability." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2138 (December 24, 2018): 20180270. http://dx.doi.org/10.1098/rsta.2018.0270.

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Liquid repellent, icephobic and self-cleaning surfaces are of interest in industrial applications, including solar panels, self-cleaning windows, wind turbines, and automotive and aerospace components. In this study, a coating using a simple and scalable fabrication technique was used to produce superliquiphobic surfaces with a low tilt angle. The coating comprises hydrophobic SiO 2 nanoparticles with a binder of methylphenyl silicone resin to achieve superhydrophobicity. After ultraviolet–ozone treatment of the coating, an additional coating of fluorosilane was deposited to achieve superliquiphobicity with low tilt angle. Data for these coatings are presented showing the ability to repel water and oil, anti-icing properties down to −60°C, self-cleaning, and the ability to maintain superliquiphobicity in hot environments up to about 95°C, after soaking in deionized water for more than 200 h at room temperature and for about 50 h at 50°C and 70°C, and in chemical environments with low pH values. The coatings were found to be mechanically durable. Detailed characterization for anti-icing provides an insight into the mechanisms of icephobicity. This article is part of the theme issue ‘Bioinspired materials and surfaces for green science and technology’.

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48

Hao, Yun Hong, Li Li, Zuo Wei Zhong, and Xiao Yan He. "Research on Anti-Erosion Mechanical Properties of Steel Structure Coating." Advanced Materials Research 189-193 (February 2011): 1199–203. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.1199.

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Steel structures are seriously affected by sandstorm in the central and western regions of Inner Mongolia, this influence is mainly reflected erosion damage to the steel structure coating by sandstorm. As the coating has critical protection role to the durability of steel structure, the damage of coating will directly lead to reduce durability and safety of steel structure system. This paper researches on the anti-erosion mechanical properties of steel structure coating materials, and measures hardness, modulus , thickness and density of the coating by use of micron-indenter and traditional methods, the result shows that hardness is 2.1516MPa, modulus is 15.62MPa, thickness distribution is in the 800um ~ 1000um and density is 1.71g/cm3. This research result will provide the basis for preparation of anti-erosion coating and evaluation safety and durability of steel structures.

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Stojanović, Ivan, Ivan Cindrić, Lovro Turkalj, Marin Kurtela, and Daniela Rakela-Ristevski. "Durability and Corrosion Properties of Waterborne Coating Systems on Mild Steel Dried under Atmospheric Conditions and by Infrared Radiation." Materials 15, no. 22 (November 12, 2022): 8001. http://dx.doi.org/10.3390/ma15228001.

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Increasing attention is given to waterborne coatings for corrosion protection due to the lower ecological impact on the environment. It has been found that by using waterborne coatings, the emission of harmful volatile organic compounds (VOCs) is reduced by more than 50 g/L. However, they require longer drying time, their anti-corrosion performance is not as good as solvent-borne coatings and they still have not been developed for all corrosion environments. Another way to reduce VOCs is by using infrared (IR) drying technology. With catalytic infrared radiation, it is possible to cure all surfaces at notably reduced costs compared to traditional systems and in total respect for the environment, thanks to significant energy savings and minimal CO2 emissions. The aim of this paper was to evaluate corrosion protective properties of waterborne coatings which were dried with traditional and accelerated drying techniques, i.e., under atmospheric conditions and by using IR technology. Two different coating systems were applied, with and without Zn in the primer. To achieve this goal, the test samples were subjected to electrochemical, corrosion, and physical tests. It was shown that infrared technology does not affect the quality of the coating and it drastically reduces the intercoating interval. A coating system with zinc in the primer showed better overall protection properties after being subjected to impedance and salt spray testing, but generally, solvent-borne coatings still have higher durability than waterborne in extreme marine conditions according to recent research. Microstructure and porosity remained intact and the atomic force microscope confirmed that the flash-off was conducted correctly since there were no pinholes and blisters detected on the coating’s surface. This study can serve as a foundation for further investigations of IC-dried waterborne coatings because there are not many at the moment.

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Smolik, Jerzy, Adam Mazurkiewicz, Zbigniew Słomka, Jan Bujak, Joanna Kacprzyńska-Gołacka, Halina Garbacz, and Piotr Wieciński. "Nanomultilayer Coatings Based on Vanadium Nitride." Solid State Phenomena 237 (August 2015): 15–20. http://dx.doi.org/10.4028/www.scientific.net/ssp.237.15.

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Based on the analysis of the research directions in the field of coatings and layers with special operating properties, the production technologies of composite coatings, including the gradient, multi-layer, and multi-component coatings, should be distinct. The paper presents the results of material properties tests of a multi-layer coating Ti / TiN / TiAlNgradient / (TiAlN/VN)multinano obtained on hot working steel EN X32CrMoV3.3. The preparation of the multilayer coating was specially designed to increase the durability of forging dies in the brass forging process. The authors discuss the results of the microstructure tests for the obtained coatings (STEM+FIB) and present the hardness and Young's modulus as a function of the distance from the surface (nanoHardness Tester CSM) and the results of adhesion tests carried out using a scratch-test method. The obtained multilayer coatings were also subject to a tribological test using a tribometer tester by DUCOM. The authors indicate that the coatings based on vanadium nitride have very high hardness and Young's modulus (HV = 32–35 GPa, E = 420–450 GPa), a much lower coefficient of friction in combination with brass than steel, and a lower stability of these parameters at elevated temperatures. According to the authors, the coating represents an interesting material solution to increase the durability of forging dies in the process of brass forging.

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