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Letteratura scientifica selezionata sul tema "Coating"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 28 settembre 2024

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Articoli di riviste sul tema "Coating"

Xu, Zhong Ping, Wen Li Han, Ying Ying Zhang e Bei Bei Xie. "Study on Epoxy Coating which Could Be Applied on High Temperature (70°C) Steel Surface". Applied Mechanics and Materials 159 (marzo 2012): 311–16. http://dx.doi.org/10.4028/www.scientific.net/amm.159.311.

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When common epoxy coatings were applied directly on high temperature (usually about 70°C) steel surface, some defects would occur in coating film, such as bubbles, pinholes, loosen and poor quality flow leveling property, etc. These defects lead to reduction in coating’s adhesion, physical properties and anti-penetrability, shorten service life of coatings greatly, making coating losing their protection function. Main reasons for those defects were analyzed briefly in this paper. In high temperature environment, solvents or other volatile organic compounds (VOC) in coatings will volatilize faster than in normal temperature environment, coating may undergo poor quality flow leveling properties, which couldn’t be fixed by itself. Research and development of a new type epoxy coating were introduced in this paper. Several methods were proposed, including selecting suitable resins, adding high boiling point solvent into coating, using leveling agent and other additives. After these modifications, coating’s construction adaptability was improved and could be applied directly on high temperature steel surface. The scanning electron microscopy (SEM) results show that the coating film prepared in high temperature condition have equivalent fine structure with film prepared in normal condition. The physical properties, anti-penetrability and anti-corrosion were also discussed in this paper

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Renner, Peter, Ajinkya Raut e Hong Liang. "High-Performance Ni-SiC Coatings Fabricated by Flash Heating". Lubricants 10, n. 3 (14 marzo 2022): 42. http://dx.doi.org/10.3390/lubricants10030042.

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In this research, a novel flash heating coating application technique was utilized to create Ni-SiC coatings on carbon steel substrates with SiC contents much higher than is achievable using certain conventional coating techniques. Hardness profiles showed that the coatings improved the substrate by as much as 121%, without affecting the substrate. Tribotests showed that the wear performance was improved by as much as 4.7× in terms of the wear rate (mm3/N·m) for the same coating when using an Al2O3 counterpart. Pure SiC coatings as a reference were also fabricated. However, the SiC coatings experienced elemental diffusion of Fe from the carbon steel substrate into the coating during fabrication. This occurred due to the increased heat input required for pure SiC to fuse to the substrate compared to the Ni-SiC coatings and resulted in decreased tribological performance. Diffusion of Fe into the coating weakened the coating’s hardness and reduced the resistance to wear. It was concluded that ceramic–metallic composite coatings can successfully be fabricated utilizing this novel flash heating technique to improve the wear resistance of ceramic counterparts.

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Jensen, Rielle, Zoheir Farhat, Md Aminul Islam e George Jarjoura. "Effect of Coating Thickness on Wear Behaviour of Monolithic Ni-P and Ni-P-NiTi Composite Coatings". Solids 3, n. 4 (1 novembre 2022): 620–42. http://dx.doi.org/10.3390/solids3040039.

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Protective coatings can prolong the lifespan of engineering components. Electroless Ni-P coating is a very hard coating with high corrosion resistance, but low toughness. The addition of NiTi nanoparticles into the coating has shown the potential to increase the toughness of electroless Ni-P and could expand its usability as a protective coating for more applications. However, the study of the tribological behaviour and wear mechanisms of Ni-P-NiTi composite coating has been minimal. Furthermore, there is no studies on the effect of coating thickness on monolithic and composite electroless Ni-P coating wear behaviour. The wear rates of each coating were found by measuring the volume loss form multi-pass wear tests. The wear tracks were examine using a confocal microscope to observe the wear mechanisms. Each sample was tested using a spherical indenter and sharp indenter. It was found that the NiTi nanoparticle addition displayed toughening mechanisms and did improve the coating’s wear resistance. The 9 μm thick Ni-P-NiTi coating had less cracking and more uniform wear than the 9 μm thick Ni-P coating. For both the monolithic and composite coatings, their thicker version had higher wear resistance than their thinner counterpart. This was explained by the often observed trend in coatings where it has higher tensile stress near the substrate interface, which decreases and becomes compressive as thickness increases. Overall, the 9 μm thick Ni-P-NiTi coating had the highest wear resistance out of all the coatings tested.

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Thunaipragasam, Selvakumaran, Aniket Bhanudas Kolekar, Koli Gajanan Chandrashekhar, Rohit Pandey, Mohammad Shahid, K. Rajesh, P. Ragupathi, Asheesh Kumar e Balkeshwar Singh. "Investigation of Mechanical Behavior and Surface Characteristics of Cold Spray Metallized B4C/AA7075 Composites Coated by AZ64 Alloy through Plasma Electrolytic Oxidation". Journal of Nanomaterials 2023 (20 aprile 2023): 1–11. http://dx.doi.org/10.1155/2023/7267093.

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Metallized cold-spray coatings were employed to make B4C/AA7075 and aluminum + plasma electrolytic oxidation (PEO) duplex coatings on AZ64. In addition, the phase structure, mechanical characteristics, wear, and PEO ceramic coatings examine the corrosion resistance. According to the findings, the PEO ceramic coating comprises α-aluminum oxide and γ-aluminum oxide, with some remnants of B4C still being preserved. PEO ceramic coatings outperformed their corresponding CS counterparts regarding mechanical characteristics and wear resistance. For example, the PEO-B4C coating achieved a hardness of 13.8 GPa and an elastic modulus of 185.5 GPa, which were 21.0% and 23.5%, respectively, more significant than the comparable values for the coating with CS. The PEO-B4C coating was 58% and 15.7% less abrasive than the equivalent CS coating due to its lower wear rate of 4.84 × 10−5 mm3/Nm and relatively lower of 0.64. The density of corrosion current in the PEO-treated B4C-AA7075 coating (3.735 × 106 A/cm2) is similar to the corrosion current density in the untreated CS coatings. Finally, compared to untreated CS B4C-AA7075, the coating’s mechanical characteristics and wear resistance are considerably enhanced by the PEO treatment.

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Shu, Xiaoyong, Hao Wang e Jianping Zhao. "Microstructures and Corrosion Behaviors of Non-Equiatomic Al0.32CrFeTi0.73(Ni1.50−xMox)(x = 0, 0.23) High-Entropy Alloy Coatings Prepared by the High-Velocity Oxygen Fuel Method". Coatings 14, n. 7 (20 luglio 2024): 907. http://dx.doi.org/10.3390/coatings14070907.

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The non-equiatomic Al0.32CrFeTi0.73(Ni1.50−xMox) (x = 0, 0.23) high-entropy alloy (HEA) coatings were prepared by the high-velocity oxygen fuel (HVOF) method. The microstructures and corrosion behaviors of the HVOF-prepared coatings were investigated. The corrosion behaviors were characterized by polarization, EIS and Mott-Schottky tests under a 3.5 wt.% sodium chloride aqueous solution open to air at room temperature. The Al0.32CrFeTi0.73Ni1.50 coating is a simple BCC single-phase solid solution structure compared with the corresponding poly-phase composite bulk. The structure of the Al0.32CrFeTi0.73Ni1.27Mo0.23 coating, combined with the introduction of the Mo element, means that the (Cr,Mo)-rich sigma phase precipitates out of the BCC solid solution matrix phase, thus forming Cr-depleted regions around the sigma phases. The solid solution of large atomic-size Mo element causes the lattice expansion of the BCC solid solution matrix phase. Micro-hole and micro-crack defects are formed on the surface of both coatings. The growth of both coatings’ passivation films is spontaneous. Both passivation films are stable and Cr2O3-rich, P-type, single-layer structures. The Al0.32CrFeTi0.73Ni1.50 coating has better corrosion resistance and much less pitting susceptibility than the corresponding bulk. The corrosion type of the Mo-free coating is mainly pitting, occurring in the coating’s surface defects. The Al0.32CrFeTi0.73Ni1.27Mo0.23 coating with the introduction of Mo element increases pitting susceptibility and deteriorates corrosion resistance compared with the Mo-free Al0.32CrFeTi0.73Ni1.50 coating. The corrosion type of the Mo-bearing coating is mainly pitting, occurring in the coating’s surface defects and Cr-depleted regions.

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Dunčková, Lucia, Tatiana Durmeková e Renáta Adamcová. "Factors Affecting the Efficiency of Hydrophobic Coatings—Experience from Application on Sandstone". Applied Sciences 14, n. 11 (25 maggio 2024): 4541. http://dx.doi.org/10.3390/app14114541.

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Protecting stone on facades or exterior art works from deterioration is primarily about protecting them from rainwater. Hydrophobic coatings are widely used for this purpose. Here, two factors affecting the long-term efficiency of some coatings applied on stones were investigated: the number of coating layers and the curing time after their application. Tests of water absorption by capillarity, absorption at total immersion in water, and a visual check of the penetration depth have been carried out. The coating’s efficiency coefficient Cef was defined as the ratio of the maximum water absorption of a treated sample to an untreated one. Two commercial silicon-based coatings were applied on the highly porous Hořice sandstone alternatively. Curing times of 2 days vs. 2 weeks, and 2 coating layers vs. 3 layers were compared. The experiments showed that the coating’s efficiency is affected more by the curing time than by the number of applied coating layers. The curing time of 2 days after coating’s application is too short, but 2 weeks proved to be sufficient for both tested coatings. There was no big difference regarding the number of coating layers; two layers seem to be sufficient if a long rain-free curing time can be guaranteed.

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Dodaran, Mohammad S., Jian Wang, Nima Shamsaei e Shuai Shao. "Investigating the Interaction between Persistent Slip Bands and Surface Hard Coatings via Crystal Plasticity Simulations". Crystals 10, n. 11 (6 novembre 2020): 1012. http://dx.doi.org/10.3390/cryst10111012.

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Fatigue cracks often initiate from the surface extrusion/intrusions formed due to the operation of persistent slip bands (PSBs). Suppression of these surface topographical features by hard surface coatings can significantly extend fatigue lives under lower stress amplitudes (i.e., high cycle fatigue), while cracks initiate early in the coating or in the coating–substrate interface under higher stress amplitudes (i.e., low cycle fatigue), deteriorating the fatigue performance. However, both beneficial and detrimental effects of the coatings appear to be affected by the coating–substrate material combination and coating thickness. A quantitative understanding of the role of these factors in the fatigue performance of materials is still lacking. In this study, crystal plasticity simulations were employed to elucidate the dependence of the coating’s effects on two factors—i.e., the coating thickness and loading amplitudes. The results revealed that the thicker coatings more effectively suppress the operation of the PSBs, but generate higher tensile and shear stresses, normal and parallel to the interfaces, respectively, promoting interfacial delamination. The tensile stresses parallel to the interface within the coating, which favors coating fracture, are not sensitive to the coating thickness.

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Yin, Yan Zi, Ji Hui Wang, Han Li, Jiu Xiao Sun, Heng Tian e Yun Dong Ji. "The Preliminary Research on the Coating of FBG Embedded in Composites used in Large Aircraft". Advanced Materials Research 239-242 (maggio 2011): 540–43. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.540.

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The optical fibers with epoxy acrylates and urethane acrylates UV-curable coatings were embedded in composites. It’s found that after high-temperature heated, when the coating’s glass transition temperature was higher than the heating temperature, the microstructure of the coating would not change, but when the coating’s glass transition temperature was lower than the heating temperature, the coating would detached from optical fiber. FBG (fiber Bragg grating) sensors with coating and naked FBG (without coating) sensors were embedded in composite materials to monitor impacting damage. It was found that when the coating broke away from the optical fiber which was embedded in the composites, the sensitivity of the FBG sensors would reduce.

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Zhu, Li Qun, Yan Bin Du, Zhen Xue e Ying Xu Li. "Structure and Anti-Corrosion of Tri-Layer Ni-P Amorphous Alloy Coating Prepared in the Same Bath". Materials Science Forum 546-549 (maggio 2007): 1805–8. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1805.

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A tri-layer amorphous Ni-P alloy coating was prepared in the same bath by changing the temperatures and currents, followed by heat treament. We studied the behavior of corrosion-resistance of the tri-layer coating before and after heat-treatment at 360°C for different time in the 5% NaCl solution. The result showed that: the tri-layer amorphous Ni-P coating has the excellent performance of anti-corrosion compare with single electroless or electrodeposited Ni-P amorphous coating. The performance of anti-corrosion of the coating was improved by controlling the coating’s structure and the role of electrochemical protection. After being heat-treated at 360°C for 1 hour ,the coating’s structure changed from amorphous to crystalloid and the corrosion resistance of the heat-treated coatings was higher than as-plated tri-layer Ni-P coating.

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Han, Yan, Xiaoxing Yan e Yu Tao. "Effect of Transparent, Purple, and Yellow Shellac Microcapsules on Properties of the Coating on Paraberlinia bifoliolata Surface". Polymers 14, n. 16 (13 agosto 2022): 3304. http://dx.doi.org/10.3390/polym14163304.

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In order to explore the applicability of the waterborne coating with self-repairing microcapsules based on the surface of wood boards and specify the optimal range of microcapsule content in the coating, three different kinds of shellac microcapsules (transparent shellac, purple shellac, and yellow shellac) were embedded in a waterborne acrylic coating at 0, 1.5 wt.%, 3.0 wt.%, 4.5 wt.%, 6.0 wt.%, and 7.5 wt.%. The Beli wood (Paraberlinia bifoliolata) boards were then covered with self-repairing coatings to investigate the self-repairing coating’s physical and chemical properties, aging resistance, and scratch repair abilities. The findings demonstrated that the chromatic difference and gloss of surface coatings on Beli wood boards were significantly influenced by the content of microcapsules. The optical characteristics and cold liquid resistance performance of the coating on Beli wood were enhanced when the microcapsule content was 3.0 wt.%. Additionally, the mechanical qualities of the coating with 3.0 wt.% transparent shellac microcapsules on Beli wood surface were better, with an H hardness, grade 2 adhesion, and 8 kg·cm of impact strength. The studies on scratch repairing and aging resistance indicated that microcapsules helped to slow down the coating’s damage and retard aging. After a microcrack appeared, the waterborne coating with microcapsules on Beli wood’s surface had the capacity to repair itself. After aging, the coating with 3.0 wt.% transparent shellac microcapsule on Beli wood boards had a better performance on the comprehensive properties, with a 28.9% light loss rate and a 6 kg·cm impact resistance. It also had a 25.0% repairing rate in scratch width after being damaged for 5 d. This study advances the development of self-healing waterborne coatings on the wood board with shellac microcapsules by examining the effects of shellac in various colors and shellac microcapsule content in waterborne coatings.

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Più fonti

Tesi sul tema "Coating"

Jiang, Chao. "Chemical reactions in can coating systems : their relevance to the coating characteristics and the performance of can coatings". Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496545.

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Abu-ali, Jareer. "Food coating application in: electrostatic atomization, non-electrostatic coating and electrostatic powder coating". The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1092539703.

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Abu-ali, Jareer Mansour. "Food coating application in: electrostatic atomization, non-electrostatic coating and electrostatic powder coating /". Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1092539703.

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Thesis (Ph. D.)--Ohio State University, 2004.
Title from first page of PDF file. Document formatted into pages; contains xii, 196 p.; also includes graphics (some col.). Includes bibliographical references (p. 185-192). Available online via OhioLINK's ETD Center

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Adegbite, Stephen Ademola. "Coating of catalyst supports : links between slurry characteristics, coating process and final coating quality". Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/920/.

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Tightening legislation for vehicles across the world has caused the use of monolith catalysts in automotive emission control to become ubiquitous. Control of the adherence and homogeneity of the platinum group metal (PGM) coating onto the monolith block, to maximise catalytic performance for a minimum PGM loading, is therefore paramount. In this study, an automatic film application is used for coating γ–alumina slurries onto Fecralloy®, an integral component of metallic monolith catalysts, to achieve the desired coating properties. Upon coating of the Fecralloy® coupons, the samples preoxidised for 10 h gave the best performance in terms of coating loading (7.94 mass %) and adherence (< 10 mass % loss) based on ultrasonic vibration test. These conditions produced the optimal surface topography, typified by conspicuous and randomly-oriented α–alumina whiskers which promote coating adherence. The optimal coating loading and adherence were achieved at a pH of 4 and solids concentrations not exceeding 40 wt%. A newly devised technique using the electromechanical testing system showed that finest particle coatings of 40 wt% solids concentration produced the best coating adherence. At solids concentration of 45 wt% the coating adherence was poor and insensitive to the blends of different particle size distributions.

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Prall, Katharina. "The Viscoelastic Behavior of Pigmented Latex Coating Films". Fogler Library, University of Maine, 2000. http://www.library.umaine.edu/theses/pdf/PrallK2000.pdf.

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Kashefi, Mehrdad. "PRIME surface coating : a novel method for making thick ceramic coatings". Thesis, Nottingham Trent University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431899.

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Jain, Rahul. "Investigations on Multiscale Fractal-textured Superhydrophobic and Solar Selective Coatings". Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78725.

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Functional coatings produced using scalable and cost-effective processes such as electrodeposition and etching lead to the creation of random roughness at multiple length scales on the surface. The first part of thesis work aims at developing a fundamental mathematical understanding of multiscale coatings by presenting a fractal model to describe wettability on such surfaces. These surfaces are described with a fractal asperity model based on the Weierstrass-Mandelbrot function. Using this description, a model is presented to evaluate the apparent contact angle in different wetting regimes. Experimental validation of the model predictions is presented on various hydrophobic and superhydrophobic surfaces generated on several materials under different processing conditions. Superhydrophobic surfaces have myriad industrial applications, yet their practical utilization has been severely limited by their poor mechanical durability and longevity. Toward addressing this gap, the second and third parts of this thesis work present low cost, facile processes to fabricate superhydrophobic copper and zinc-based coatings via electrodeposition. Additionally, systematic studies are presented on coatings fabricated under different processing conditions to demonstrate excellent durability, mechanical and underwater stability, and corrosion resistance. The presented processes can be scaled to larger, durable coatings with controllable wettability for diverse applications. Apart from their use as superhydrophobic surfaces, the application of multiscale coatings in photo-thermal conversion systems as solar selective coatings is explored in the final part of this thesis. The effects of scale-independent fractal parameters of the coating surfaces and heat treatment are systematically explored with respect to their optical properties of absorptance, emittance, and figure of merit (FOM).
Master of Science

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Cakar, Ilknur. "Conductive Coating Materials". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607410/index.pdf.

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In this study, electrically conductive coating materials composed of epoxy resin and carbon black (CB) were prepared by applying two different mixing techniques (Grinding and Mechanical Mixing). The effect of carbon black addition, ultrasonication, mixing type and surface modification of carbon black on the morphologies, electrical and mechanical properties of the composites were investigated. According to test results, Grinding Method is much more efficient and for this method, percolation concentration was found as 2 vol %. The electrical resistivity value obtained at this composition is around 107 ohm.cm. Also, for the samples prepared by Grinding Method, the hardness increased by adding conductive filler, but the impact energy and adhesive strength decreased with increasing carbon black content. Ultrasonication was applied to the samples containing 2 vol % CB obtained by Grinding Method to reduce the electrical resistivity further. Three different ultrasonic mixing times were tried, however, no positive effect was observed on electrical and mechanical properties. Since the addition of carbon black has a negative effect on the processability of the mixture, it was aimed to obtain desired conductivity value at lower percolation concentration by modifying carbon black surface with different silane coupling agents and formamide. The best result in terms of electrical conductivity was obtained for the materials produced with formamide treated carbon black by Grinding Method. At 1 vol % concentration, the electrical resistivity was found as approximately 106 ohm.cm which is three orders smaller than the resistivity of materials prepared with untreated carbon black.

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Andrea, Bergqvist. "Coating fine particles". Thesis, Uppsala universitet, Institutionen för kemi - Ångström, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-235233.

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Controlled release of an active is used in many applications. An example is drug delivery were it is desirable to release the active substance close to the target. In paints can anti-mold substances be encapsulated and released slowly during a long time which can extend the lifetime of the paint. This work investigated a coating process of loaded particles with as low leakage of the active substance as possible. It was also studied if the coating process was scalable. The particles in use were porous silica that was coated with sodium dodecyl sulphate (SDS), polyethyleneimine (PEI) and tetraethyl orthosilicate (TEOS). To fill particles, the active was dissolved in a solution and the particles were added. The active adsorbed into the pores of the particle. The coating principle was about the same for all layers. The coating molecules were dissolved in a solvent and the particles were added during stirring. After centrifugation the coated particles were separated from the solvent and left to dry. The thermogravimetric analyzer (TGA) was used to calculate the amount of adsorbed polymers on the particle surface. UV/VIS spectrometer analyzed the release rate of the active. As the recipe was optimized, SDS could be excluded from the process. An adsorption isotherm for PEI on the particle surface showed that 0.5 g PEI/ g particle the ratio required for covering the surface completely. It was proved that if the active was dissolved in all coating solutions during the coating, less leakage appear and makes the coating process more controlled. A higher amount of both PEI and TEOS improves the encapsulation of the active, which reduces the release rate. The coating process is proved to be scalable as the particle concentration is increased from 4.72 % to 16.5 % without too much agglomeration.

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ZIPPERIAN, DONALD CHARLES. "PHYSICAL AND CHEMICAL CHARACTERISTICS OF THE ZINCATE IMMERSION PROCESS FOR ALUMINUM AND ALUMINUM ALLOYS". Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184123.

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A detailed experimental study has been carried out to investigate the zincate immersion deposition process for 99.99%, 6061, and 356-T6 aluminum samples. In particular, the effect of iron and tartrate in the immersion bath, the aluminum surface preparation, and the relationship of the first immersion step to the second immersion step were investigated by chemical, electrochemical (polarization and rest potentials), and surface analytical scanning electron microscopy (SEM), transmission electron microscopy (TEM), Rutherford backscattering spectrometry (RBS), X-ray photoelectron spectroscopy (XPS), and Auger electron spectroscopy (AES) techniques. Eh-pH diagrams were constructed to determine the most stable zinc, iron, and aluminum species in solution. These diagrams predict that ferrous and ferric ions, as well as aluminum should form stable complexes with tartrate at the typical immersion deposition conditions (Eh -0.9 to -1.0 and pH 14 to 15). Experimentally, tartrate was found to enhance the dissolution rate of aluminum in highly caustic solutions. The addition of ferric chloride to the immersion bath produced coatings that were more crystalline, and also decreased the amount of hydrogen gas evolved in the second immersion step. The deposition of zinc and iron during the second immersion step was considerably less than that during the first immersion step. The second immersion coating became more adherent as the initial surface roughness decreased, and as grain size was increased the second immersion coating became thicker. For increasing grain size the micrographs for the first and second immersion coatings showed that the coatings became more localized. The second immersion coating thickness and morphology were also dependent upon several first immersion variables, such as bath temperature, immersion time and bath composition. Increased dissolution rates of aluminum in the first immersion produced thinner coatings with a finer crystallite growth. Increased bath temperature and increased first immersion time enhanced the dissolution rate of aluminum. The zinc coating slowed the dissolution rate of aluminum. When zinc was absent from the first immersion bath, the aluminum dissolution was much faster and resulted in thinner coatings upon subsequent second immersion. The molar ratio of zinc deposited to aluminum dissolved was a constant value of 1.1 for both first and second immersions; the molar ratio was also constant for the different aluminum substrates examined in this investigation.

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Più fonti

Libri sul tema "Coating"

H, Stern K., a cura di. Metallurgical and ceramic protective coatings. London: Chapman & Hall, 1996.

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H, Stern K., a cura di. Metallurgical and ceramic protective coatings. London: Chapman & Hall, 1996.

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H, Lindsay James, e ASM International, a cura di. Coatings and coating processes for metals. Materials Park, OH: ASM International, 1998.

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Parys, Marc Van. Coating. Guimaraes: Universidade do Minho, 1994.

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Parys, Marc Van. Coating. Guimaraes: Universidade do Minho, 1994.

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Vittorio, Gregotti, a cura di. Coating. Bologna: Editrice Compositori, 1998.

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Hester, Charles I. Powder coating technology. Park Ridge, N.J., U.S.A: Noyes Data Corp., 1990.

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Ohlupin, Dmitriy, Al'bert Korolev e Il'ya Sinev. Mechanochemical method of polishing a polycrystalline diamond coating. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1141765.

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The monograph presents a solution to the technological problem of polishing a polycrystalline diamond coating by a mechanochemical method in order to ensure the required surface roughness and high processing performance. The analysis of existing schemes and methods of polishing diamonds and diamond coatings is carried out. A technology for polishing diamond coatings with a metal brush is proposed, which provides brittle destruction of the vertices of large micro-roughnesses and graphitization of small micro-roughnesses. For researchers, postgraduates and specialists of industrial enterprises involved in the technology of polishing the surfaces of parts.

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G, Higgins Brian, a cura di. Coating fundamentals: Suspension rheology for coating. Atlanta, GA: TAPPI Press, 1988.

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Braun, Juergen H. White pigments. Blue Bell, PA: Federation of Societies for Coatings Technology, 1995.

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Capitoli di libri sul tema "Coating"

Wan, Li, Xiang Pan, Lizhen Huang, Baotao Huang, Cai Yang e Yiming Du. "The Influence of Coating Material and Thickness on the Corrosion Degree of Q345 Steel". In Lecture Notes in Civil Engineering, 75–82. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1748-8_6.

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AbstractIn order to investigate the anti-corrosion effect of coated steel of steel bridge, Q345 steel plate specimens with three types of coatings, including zinc coating, aluminum coating and zinc-aluminum coating, are produced by the arc spraying technology. In the present study, chlorine corrosion tests are performed to investigate the influence law of different coating material and its thickness on the corrosion degree. Then the calculation results of two corrosion indicators are compared and analyzed. It is shown that the two corrosion indicators reflect the same corrosion law of three kinds of coating steel. The corrosion of all coated specimens is obviously severe in the early stage and gradually gentle in the later stage. It is also found that during the whole corrosion cycle, the corrosion rate of aluminum coating is smaller and change slower than the other two kinds of coatings, whereas the coating thickness of 200 μm of aluminum coating changes significantly. Therefore, aluminum coating is recommended as a priority, and the recommended coating thickness range of which is 100–150 μm.

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Fiedler, Torben, Joachim Rösler, Martin Bäker, Felix Hötte, Christoph von Sethe, Dennis Daub, Matthias Haupt, Oskar J. Haidn, Burkard Esser e Ali Gülhan. "Mechanical Integrity of Thermal Barrier Coatings: Coating Development and Micromechanics". In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 295–307. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_19.

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Abstract To protect the copper liners of liquid-fuel rocket combustion chambers, a thermal barrier coating can be applied. Previously, a new metallic coating system was developed, consisting of a NiCuCrAl bond-coat and a Rene 80 top-coat, applied with high velocity oxyfuel spray (HVOF). The coatings are tested in laser cycling experiments to develop a detailed failure model, and critical loads for coating failure were defined. In this work, a coating system is designed for a generic engine to demonstrate the benefits of TBCs in rocket engines, and the mechanical loads and possible coating failure are analysed. Finally, the coatings are tested in a hypersonic wind tunnel with surface temperatures of 1350 K and above, where no coating failure was observed. Furthermore, cyclic experiments with a subscale combustion chamber were carried out. With a diffusion heat treatment, no large-scale coating delamination was observed, but the coating cracked vertically due to large cooling-induced stresses. These cracks are inevitable in rocket engines due to the very large thermal-strain differences between hot coating and cooled substrate. It is supposed that the cracks can be tolerated in rocket-engine application.

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Ji, S., H. Gui, G. Guan, M. Zhou, Q. Guo e M. Y. J. Tan. "Designing Waterborne Protective Coatings Through Manipulating the Nanostructure of Acrylic-Based Nanocomposites". In Lecture Notes in Civil Engineering, 113–25. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_14.

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AbstractWaterborne coatings with intended functionalities have been designed by manipulating acrylic-based nanocomposites with different nanostructures. Taking advantage of the favorable structure of acrylic copolymers, three waterborne coatings with various desired properties were created through molecular engineering either by copolymerizing with other components or through nanocomposite formation. This approach was demonstrated by synthesizing acrylic-based waterborne coatings with three different nanostructures, namely homogeneous, worm-like, and spherical-like nanostructures. The properties of coating samples prepared by this new approach and by traditional physical blending were compared experimentally, which revealed that the incorporation of 3-methacryloxypropyltrimethoxysilane (MPS)-modified nanoparticle TiO2 in an acrylic base enabled the formation of a nanocomposite with nanoparticles uniformly distributed in the acrylic base. The coating film with this acrylic-TiO2 nanocomposite showed significantly better UV absorption performance than the coating made by physical blending. The copolymerization of acrylic copolymers with an organic polymer (alkyd) created a worm-like nanostructure of acrylic–alkyd composite that allowed uniform distribution of the acrylic–alkyd nanocomposite in a more closely packed dense coating film, leading to enhanced barrier property and significantly improved corrosion resistance as confirmed by electrochemical impedance spectroscopy and salt spray tests. The copolymerization of acrylic monomers with an inorganic polymer (polydimethylsiloxane [PDMS]) led to a spherical-like nanostructure of acrylic–PDMS composite film. The formation of this nanostructure arose from the migration of PDMS segments, and a PDMS-rich phase formed on the film’s surface, which resulted in a coating film with PDMS functionalities such as low dirt-picking behavior. Overall, these three cases demonstrated that acrylic copolymer are an excellent base for developing various nanocomposite waterborne coatings with different functionalities through copolymerization and that the nanocomposites with different nanostructures have a significant influence on the coatings’ performance.

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Gooch, Jan W. "Coating". In Encyclopedic Dictionary of Polymers, 149–50. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2504.

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Hill, Loren W. "Coating". In Plastics and the Environment, 211–41. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2004. http://dx.doi.org/10.1002/0471721557.ch6.

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Arndt, T. "Coating". In Springer Reference Medizin, 611. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-48986-4_763.

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Arndt, T. "Coating". In Lexikon der Medizinischen Laboratoriumsdiagnostik, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49054-9_763-1.

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Grammatikopoulos, Panagiotis, e Mukhles Sowwan. "Coating". In Gas-Phase Synthesis of Nanoparticles, 269–86. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2017. http://dx.doi.org/10.1002/9783527698417.ch14.

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Kühn, Klaus-Dieter. "Coating". In Management of Periprosthetic Joint Infection, 311–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-54469-3_9.

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Gerhard, Christoph. "Coating". In Optics Manufacturing, 197–209. Boca Raton : Taylor & Francis, a CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa, plc, [2017] | Series: Optical sciences and applications of light: CRC Press, 2017. http://dx.doi.org/10.1201/9781351228367-11.

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Atti di convegni sul tema "Coating"

Guenther, Karl H. "Coating Of Plastics - Coatings On Plastic". In 1988 Los Angeles Symposium--O-E/LASE '88, a cura di Max J. Riedl. SPIE, 1988. http://dx.doi.org/10.1117/12.944471.

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Qin, Feng, Y. Kevin Chou, Dustin Nolen e Raymond G. Thompson. "Diamond Coatings for Machining: Coating Thickness Effects". In ASME 2009 International Manufacturing Science and Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/msec2009-84358.

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Chemical vapor deposition (CVD)-grown diamond films have found applications as a hard coating for cutting tools. Even though the use of conventional diamond coatings seems to be accepted in the cutting tool industry, selections of proper coating thickness for different machining operations have not been often studied. Coating thickness affects the characteristics of diamond coated cutting tools in different perspectives that may mutually impact the tool performance in machining in a complex way. In this study, coating thickness effects on the deposition residual stresses, particularly around a cutting edge, and on coating failure modes were numerically investigated. On the other hand, coating thickness effects on tool surface smoothness and cutting edge radii were experimentally investigated. In addition, machining Al matrix composites using diamond coated tools with varied coating thicknesses was conducted to evaluate the effects on cutting forces, part surface finish and tool wear. The results are summarized as follows. (1) Increasing coating thickness will increase the residual stresses at the coating-substrate interface. (2) On the other hand, increasing coating thickness will generally increase the resistance of coating cracking and delamination. (3) Thicker coatings will result in larger edge radii; however, the extent of the effect on cutting forces also depends upon the machining condition. (4) For the thickness range tested, the life of diamond coated tools increases with the coating thickness because of delay of delaminations.

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Bhattacharya, R., O. N. Senkov, A. K. Rai, X. Ma e P. Ruggiero. "High Entropy Alloy Coatings for Application as Bond Coating for Thermal Barrier Coating Systems". In ITSC 2016, a cura di A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen e C. A. Widener. DVS Media GmbH, 2016. http://dx.doi.org/10.31399/asm.cp.itsc2016p0279.

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Abstract High-entropy alloys (HEAs) are well suited for use in high-temperature environments due to their combination of strength, ductility, thermal stability, and corrosion and wear resistance. In this study, NiCoCrAlSi-based HEA coatings are deposited by HVOF and air plasma spraying (APS) and their phases, microstructure, and composition are evaluated by means of XRD, SEM, and EDS analysis. The results show that BCC/B2 phases are the main constituent in HVOF coatings that were diffusion heat treated. APS coatings of the same composition, on the other hand, exhibited a two-phase structure consisting of L12 and BCC/B2 phases. The HEA coatings produced by HVOF were tested for oxidation resistance and their morphology and oxide scales were examined with the aim of developing a high-quality bond coat for thermal barrier coating (TBC) systems.

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Vuoristo, P., J. Tuominen e J. Nurminen. "Laser Coating and Thermal Spraying - Process Basics and Coating Properties". In ITSC2005, a cura di E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p1270.

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Abstract The paper describes the some differences of laser coating (laser cladding or laser spraying) process in comparison to thermal spraying. Laser coating is a novel coating process, which produces coatings with high density, metallurgical bonding and low heat input to the substrate. Laser coating types and coating properties are reviewed and compared with thermally sprayed coatings. Typical application areas of laser coatings are presented.

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Rogers, Robert H. "Tar-Polyurethane Joint Coating for the Three-Layer Polyethylene Pipeline Coating". In 1996 1st International Pipeline Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/ipc1996-1827.

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This article describes a new joint coating system implemented by Bechtel for a major international, 48 inch diameter gas pipeline. Despite the long history of use as a pipe and valve coating, the new implementation is the industry’s first significant use of a thermoset hot spray coating applied to field weld areas of pipe, mill coated with a three layer polyethylene system. In the laboratory and in field trials, the coating demonstrated integrity, was applied much quicker than the traditional heat shrink sleeve, and eliminated several application contingencies. Laboratory investigations undertaken in Houston, Texas and Lyon, France were key steps in selecting the 100% solids tar-polyurethane coating. Additionally, the testing assisted in developing the surface preparation technique, and demonstrating the coating’s ability to adhere to the polyethylene coating as well as the steel pipe. Serious localized corrosion, and cathodic protection shielding associated with other joint coatings are less probable with the new joint coating system. Actual field cathodic protection testing indicated very low current consumption for the completed pipeline. The efficient joint coating operation contributed to setting new construction records.

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Suzuki, M., S. Sodeoka e T. Inoue. "Zircon-Based Ceramics Composite Coating for Environmental Barrier Coating". In ITSC2007, a cura di B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima e G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0523.

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Abstract Studies on plasma spraying of zircon (ZrSiO4) have been carried out by the authors as one of the candidates for an environmental barrier coating (EBC) application, and had reported that substrate temperature is one of the most important factors to obtain crack-free and highly-adhesive coating. In this study, several amount of yttria were added to zircon powder, and the effect of the yttria addition on the structure and properties of the coatings were evaluated in order to improve the stability of the zircon coating structure at elevated temperature. The coatings obtained were composed of yttria stabilized zirconia (YSZ), glassy silica, while the one prepared from monolithic zircon powder composed of the metastable high temperature tetragonal phase of zirconia and glassy silica. After the heat treatment over 1473K, silica and zirconia formed zircon in all the coatings. However, the coatings with the higher amount of yttria had less amount of zircon formed. This resulted in the less open porosity of the coating at elevated temperature. These yttria added coatings also showed good adhesion even after the heat treatment, while monolithic zircon coating had pealed off.

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Zunino III, J. L. "Active coatings technologies for tailorable military coating systems". In The 14th International Symposium on: Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, a cura di Vijay K. Varadan. SPIE, 2007. http://dx.doi.org/10.1117/12.716060.

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Osawa, S., T. Itsukaichi e R. Ahmed. "Influence of Substrate Properties on the Impact Resistance of WC Cermet Coatings". In ITSC2004, a cura di Basil R. Marple e Christian Moreau. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.itsc2004p0492.

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Abstract This research delivers an integrated performance of generic coating-substrate systems under impact loading, and comprehends the understanding of underpinning failure mechanisms. This investigation thus benchmarks the coating design process for high impact stress applications. Repeated severe impacts to the coatings often result in poor performance by cracking and delamination from the coating-substrate interface. The durability and delamination resistance of coatings depend on the choice of coating and substrate materials, coating deposition process and service conditions. The design of overlay thermal spray coatings thus requires an optimization of these parameters. A thorough understanding of the underpinning failure mechanisms is thus critical for future coating developments. This investigation thus provides an insight to the role coating and substrate properties on the impact resistance of coated materials, and maps the relationship between the impact resistance of WC-Co and WC-CrC-Ni coatings on a variety of substrates. Results indicate that coating’s delamination resistance during impact loading not only depends upon the hardness and roughness of the substrate material, but more importantly, substrates with higher work-hardening coefficient indicate a higher delamination resistance during impact loading.

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Adachi, M., T. Takabatake, A. Ohmori e M. Kremer. "New Structure of APS Sprayed AI2O3 Coatings Investigated by Cu-Electroplating". In ITSC2008, a cura di B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima e G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p1009.

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Abstract A copper electroplating method revealed that recently developed commercial Al2O3 thermal spray coatings did not have the well-known lamellar structure but instead had a structure that was made up of tightly bonded particles, with many vertical microcracks in the coating. The coating in the study was prepared by the atmospheric plasma spray system. The copper electroplating method was applied to observation of the Al2O3 thermal spray coating structure. Spray coating specimens were electroplated in an aqueous solution containing CuSO4, H2SO4, CuCl2, and additives so that copper was deposited in small pores and narrow cracks in the coatings. Copper in the Al2O3 coatings was observed clearly by scanning electron microscopy, which also revealed the coating’s structure (boundaries of flattened particles and vertical cracks). The coating did not have a lamellar structure (horizontal apertures between flattened particles) and it was dense in spite of the many microcracks.

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Chen, Jiaxi, Changzi Chen, Xiao Fang, Haixiang Jiang e Quan Xin Jiang. "Design of a device for automatically coating lubricating coatings". In 2022 8th International Conference on Mechanical Engineering and Automation Science (ICMEAS). IEEE, 2022. http://dx.doi.org/10.1109/icmeas57305.2022.00017.

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Rapporti di organizzazioni sul tema "Coating"

Payer. L51962 Coating Failure Consequences to CP Shielding. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), settembre 2002. http://dx.doi.org/10.55274/r0011268.

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The objective of this project was to better understand the failure mechanisms of pipeline coatings, and to determine if the coating damage is conducive to external corrosion or SCC. The focus was on coatings where the failure mechanism and consequence of coating damage are not fully understood. The selected coating system for study was a 3-layer coating comprised of an inner layer of FBE; an intermediate adhesive layer of copolymer polypropylene; and an outer layer of extruded polypropylene.

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Miller, Mr Michael J. DTPH56-06-T-000017 In-Field Welding and Coating Protocols. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), maggio 2009. http://dx.doi.org/10.55274/r0012117.

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Gas Technology Institute (GTI) and Edison Welding Institute (EWI) created both laboratory and infield girth weld samples to evaluate the effects of weld geometry and hydrogen off-gassing on the performance of protective coatings. Laboratory-made plate welds were used to tightly control geometric differences and in-field welds were created to mimic real-world welding conditions and hydrogen off-gassing rates. These welds were then coated and tested with accelerated corrosion techniques to evaluate the coatings' effectiveness. Simulated girth welds investigated geometric effects on the performance of a liquid-applied coating. Welds were created, coated, and testing in a salt-fog environment to accelerate corrosion. Undercuts up to 0.03 inches were found to have no significant effect on coatings' resistance to corrosion. On the contrary, the undercut tended to add to the coating thickness and therefore increased corrosion resistance. Increasing cap height of a weld was found to thin the coating making it more susceptible to chipping but no more susceptible to corrosion. If applying proper coating procedures, especially surface profiling, the weld geometries investigated here had no strong negative effects on a liquid applied two-part epoxy coating's performance. Since fusion-bonded epoxy (FBE) coatings are applied in a different manner, these results cannot be extended from liquid to FBE coatings. If the FBE provides the same wetting of the undercut and similar coating thickness on the cap height one would expect similar results. In-field welds were created to test the effects of hydrogen off-gassing on coating performance. Two different welding mediums were used, one with a high hydrogen content and one with low hydrogen content. These different welds were then held for 2 or 5 hours to vary the amount of time allowed for hydrogen off-gassing and then coated in either FBE or a liquid 2 part epoxy. All other variables were held constant. Cross-sectional analysis of coated 24-inch diameter pipes showed no increase of voids above the welded area, indicating there was little off-gassing in these samples. Cathodic Disbondment Testing, per ASTM G-95, was performed to evaluate the coating's adhesion properties. No detectable adhesion differences were found that could be attributed to the hydrogen off-gassing from the weld, instead, the results were more dependent on the coating thickness. Within the scope/boundary of the completed research, a hold time of two hours is sufficient to minimize any hydrogen off-gassing effects. Within the parameters of the in-field welds and simulated welds, no major detrimental effects were found from hydrogen off-gassing and weld geometries. However, the higher cap-height did make coatings more susceptible to damage when handling. This confirms previous GTI research which indicated that coatings often accrue damage during handling. GTI and EWI, taking into consideration the survey and testing results produced a recommendation to be distributed to various stakeholders in the pipeline industry. The summary document to be disturbed is located in the Recommendation section of this report.

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Ruschau. L51887 Compatibility of Repair Coatings Applied to Existing Below Grade Coatings. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), aprile 2002. http://dx.doi.org/10.55274/r0010209.

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Defects and holidays in mainline coatings necessitate the use of repair coatings for all coated pipelines. This includes both newly coated pipelines just out of the plant as well as existing buried lines in need of small repairs. The repair coating must provide corrosion protection for the steel, lessen the demand on the cathodic protection system, and provide good long-term service. In short, the repair coating must protect the pipe to the same extent as the mainline coating. Two additional requirements for repair coatings are that they adhere not only to the steel but also to the existing mainline coating, and that they be field-applicable under varying ambient conditions. Repair coatings sometimes also have to adhere to non-ideal surfaces, including poorly prepared welds, thermite welds, and flash rusted steel. The compatibility of commercially available repair coatings applied to common mainline pipe coatings was investigated by a laboratory investigation. The mainline coatings investigated were fusion bond epoxy (FBE), coal tar enamel, asphalt enamel, cold-applied polyethylene tape wrap, and extruded polyethylene. Specific combinations ofmainline coatings with different types repair coatings were evaluated for chemical compatibility and adhesion strength in three different scenarios:· As applied to a new pipeline coating, simulating initial repairs made at a coating plant or on a job site prior to installation· As applied to an artificially aged pipeline coating, simulating repairs made to a mainline coating which has been in buried service· After artificially aging a repaired mainline coating, simulating the longer term service of an initial repair made at a coating plant or job site prior to installation.

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Bowman, Mark D., Bryan D. Hagan e William D. Hurdle. Steel Bridge Coating Evaluation and Rating Criteria. Purdue University, 2023. http://dx.doi.org/10.5703/1288284317386.

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The aim of the study is to gather information on three topics: (1) the evaluation and rating of steel bridge protective coatings, (2) coating systems used by various states throughout the United States, and (3) maintenance painting procedures employed by various state department of transportation agencies (DOTs). First, it was found that most state DOTs use either an Element Level type rating of the coating system or a 9–0 NBI type rating; many state DOTs use both methodologies, with one used for state bridges and the other for local bridges. Second, for coating systems, it was found that there is a great deal of uniformity of the steel bridge coating systems used in the United States, with three-coat paint systems being the most common. Third, it is believed that maintenance painting can extend the useful life of bridge coatings. However, many state DOTs report that the cost of maintenance painting has increased due to many factors that involve available personnel, proper training, and increased regulations on the removal and application of steel bridge coatings. Consequently, many DOTs no longer perform maintenance painting, other than emergency repairs, and simply wait until the entire bridge needs to be re-coated and contract the work out. Lastly, an NBI 9–0 type rating procedure for steel bridge coatings is proposed for possible consideration and implementation by INDOT.

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Vilda, William, e David Kroon. NRXE27X Testing and Evaluation of Coating Performance in Transition Zones. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), gennaio 2005. http://dx.doi.org/10.55274/r0012080.

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The scope of work includes a collection of field data on the existing transition zone coating systems to document performance. This information is supplemented with data from laboratory testing of fusion-bonded epoxy (FBE) pipeline coating and select supplemental, transition coatings. The overall objectives of the project are 1) identify situations where transition coating failure occurs based on field evidence and 2) develop a test protocol for evaluating supplemental coatings for use in the transition zone. The corresponding data is included in a spreadsheet.

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Ruschau. L52186 Effective Methods of Removing Existing Coating. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), settembre 2005. http://dx.doi.org/10.55274/r0011355.

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The effectiveness of different coating removal techniques during investigative excavations was studied by a combination of laboratory testing and field investigation. During repair and investigative pipeline digs, a disproportional amount of time and effort is often spent removing old existing coating so as not to damage the pipe underneath. The necessity for examining the steel surface under the coating requires careful but thorough coating removal or else the important features on that surface will be lost. The objectives of this work were the following: Determine the relative effectiveness of existing techniques used to remove coating at bellhole digs Utilize advanced or novel techniques to realize an improvement in efficiency Catalog efficient coating removal methods with different mainline coatings. Verify the best removal methods in a field test

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Author, Unknown. PR-138-162-R02 Degree of Reaction of Fusion-Bonded Epoxy Coatings. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), dicembre 1986. http://dx.doi.org/10.55274/r0012138.

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This document describes a test method for the degree of reaction of fusion-bonded epoxy coatings by direct-current resistivity. This method covers the determination of a transition temperature of cured fusion-bonded epoxy coatings by measurement of the changes in direct-current resistivity of the coating with temperature. Comparison of this temperature with the degree of reaction for that coating material as determined by differential scanning calorimetry will allow the estimation of the degree of reaction of the coating sample being tested.

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Wang, Hao, Milad Salemi, Jiaqi Chen, P. N. Balaguru, Jinhao Liang e Ning Xie. DTPH56-15H-CAP04L An Inorganic Composite Coating for Pipeline Rehabilitation and Corrosion Protection. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), dicembre 2018. http://dx.doi.org/10.55274/r0011991.

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The project aims to address the need for an inorganic coating composite for corrosion protection of pipelines in an aggressive environment. The inorganic coating does not generate CO2 emission or volatile organic content (VOC). Inorganic coatings are frequently used in the construction industry as anti-corrosion coatings, which are effective, chemically inert, hard, and thermally stable. In this study, microfiber reinforcement and Nano-modification were used to improve the performance of the inorganic coating system. The research work integrates both laboratory testing and numerical simulations. The major tasks conducted are 1) development of an inorganic coating with Nano modification; 2) accelerated corrosion testing; 3) durability and adhesion strength testing; 4) shear testing of coating with carbon fiber reinforced polymer (CFRP), and 5) analytical study of composite repair system of the pipeline.

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Sansum, Andrew J. PR-248-9513-R01 Evaluation of Different Field Joint Coating Materials for Existing FBE Coated Pipe. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), novembre 1998. http://dx.doi.org/10.55274/r0012045.

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The selection of girth weld coatings for pipe coated with fusion bonded epoxy is usually determined by specific criteria related to the particular project. Other than the actual long-term performance of the coating there are other factors that are generally considered such as field application criteria, production rates, and other economic considerations. It has been found that coatings applied to the girth weld areas of pipe are not performing to anticipated life expectancy. Some are failing in as little as five years resulting in corrosion of the steel under the joint coating material. The purpose of this project was to evaluate the selected coatings from a performance standpoint only to be compared with fusion-bonded epoxies in order to predict the life expectancy relative to the parent pipe coating. Laboratory testing using accelerated test conditions can give a good indication of the expected life of coating material.

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Bruce e Li. L51666 Surface Preparation and Coatings on the Susceptibility of Line Pipe to Stress-Corrosion Cracking. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), febbraio 1992. http://dx.doi.org/10.55274/r0010315.

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Within the last decade, a number of gas pipeline companies throughout the world have identified the presence of Stress-Corrosion Cracking (SCC) on their pipelines. While the cause of the SCC resulted from a multitude of factors, there appeared to be a commonality relating to pipeline coatings. Although SCC has occurred under polyethylene/PVC tapes and enamel coatings, not a single incident has been recorded where SCC has occurred on a fusion-bonded-epoxy coated line. The three major factors that were thought to account for the difference in the SCC performance of the various coatings were; (1) resistance of a coating to disbonding, (2) the ability to pass current through the coating and thereby protect the disbonded regions and (3) the surface preparation of the line pipe prior to coating application. These factors were addressed in this three-year program for PRCI. This report examines the relationship between coatings and surface preparation and the likelihood of subsequent stress corrosion cracking. Standard Cathodic disbondment tests, measurements of potential gradients beneath disbonded coating, electrochemical measurements of current passages through coatings and actual SCC tests are described and results reported.

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