Bibliografie tematiche / Protective coatings

Letteratura scientifica selezionata sul tema "Protective coatings"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 30 luglio 2024

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Articoli di riviste sul tema "Protective coatings"

1

Mabrouk, Ahmed, e Zoheir Farhat. "Novel Ni-P-Tribaloy Composite Protective Coating". Materials 16, n. 11 (25 maggio 2023): 3949. http://dx.doi.org/10.3390/ma16113949.

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Oil and gas pipelines are subject to various forms of damage and degradation during their operation. Electroless Nickel (Ni-P) coatings are widely employed as protective coatings due to their ease of application and unique properties, including high wear and corrosion resistance. However, they are not ideal for protecting pipelines due to their brittleness and low toughness. Composite coatings of higher toughness can be developed through the co-deposition of second-phase particles into the Ni-P matrix. Tribaloy (CoMoCrSi) alloy possesses excellent mechanical and tribological properties making it a potential candidate for a high-toughness composite coating. In this study, Ni-P-Tribaloy composite coating consisting of 15.7 vol.% Tribaloy was successfully deposited on low-carbon steel substrates. Both the monolithic and the composite coatings were studied to evaluate the effect of the addition of Tribaloy particles. The micro-hardness of the composite coating was measured to be 6.00 GPa, 12% greater than that of the monolithic coating. Hertzian-type indentation testing was carried out to investigate the coating’s fracture toughness and toughening mechanisms. The 15.7 vol.% Tribaloy coating exhibited remarkably less severe cracking and higher toughness. The following toughening mechanisms were observed: micro-cracking, crack bridging, crack arrest, and crack deflection. The addition of the Tribaloy particles was also estimated to quadruple the fracture toughness. Scratch testing was performed to evaluate the sliding wear resistance under a constant load and a varying number of passes. The Ni-P-Tribaloy coating exhibited more ductile behavior and higher toughness, as the dominant wear mechanism was identified as material removal, as opposed to brittle fracture in the Ni-P coating.
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Вachinskyi, V., S. Abramov, O. Кondratenko, A. Buz, A. Shevchenko e O. Sokolovsky. "OPPORTUNITIES OF MULTILAYER PROTECTIVE COATINGS". Collection of scientific works of Odesa Military Academy 1, n. 13 (30 dicembre 2020): 237–43. http://dx.doi.org/10.37129/2313-7509.2020.13.1.237-243.

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The article discusses the problem of using multilayer protective coatings for weapons and military equipment in order to provide protection from atmospheric and aggressive environments and mask objects simultaneously. The difference between these coatings from the known paint coatings is that they are capable of performing several functions simultaneously. The practical use of multilayer protective coatings allows you to increase the combat effectiveness of weapons of the Land Forces. Multilayer protective coatings are the most affordable and effective means of protecting weapons and military equipment products formed on the surface of products as a result of the application of liquid paints and their drying. The urgency of work in this area is due to the fact that at present there are no means of enhancing the protection of the application of liquid paints due to the use of protective coatings. Thus, the urgency of solving the problems associated with improving the protection of the application of liquid paints by the use of multi-layer protective coatings is unconditional at this time. Camouflage coloring reduces the visibility of military equipment and weapons due to the merging of individual color spots with the surrounding background and reduces the range of detection and identification of equipment and weapons when reconnoitered by photographing and observing with the naked eye or in electron-optical and optical devices. In addition, camouflage coloring increases the effectiveness of masking equipment with service tools and local materials at hand. The article shows that due to the preventive application of multilayer protective coatings, it is possible to successfully increase protection and camouflage and, consequently, the combat effectiveness of weapons and military equipment. The purpose of this article is to address the issue of the protection of the application of liquid paints through the use of multi-layer protective coatings. Keywords: protective coatings, paint, weapons and military equipment, multilayer protective coatings, liquid paints, camouflage coloring, combat effectiveness of weapons and military equipment.
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Zhang, Zhong Li, Qi Shen Wang, Peng Rao Wei e Xue Gong. "Arc-Spraying Composite Coatings on Mild Steel for Long-Term High-Temperature Oxidation Protection". Advanced Materials Research 690-693 (maggio 2013): 2039–45. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.2039.

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An arc-spraying composite coating system for high-temperature oxidation protection is composed of an inner Fe-Cr-Al alloy layer and an Al-Si alloy outer layer. The high-temperature oxidation behavior of the composite coatings on steel substrate was studied during isothermal exposures in air at 900°C. Experiments show that the coatings on steel substrate are not deteriorated and the substrate is protected well, being exposed to high temperatures up to 900°C. Inter diffusion of alloying elements within the protective coatings occur, while the elements, Cr and Al, are also diffusing to the core of the base metal. As test time proceeds, a large number of chromium oxides are generated in situ within the protective coatings, especially close to the coating/substrate interface. The oxides generated increase the bond strength of the coating to the steel substrate, and together with the surface alumina they provide a long-term effective anti-oxidant protection to steel substrate. The results on titanium sponge production site show that the protective coatings on the reactor have provided an effective protection and prolong the lifetime at least forty percent for the reactors.
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Matziaris, Katia, Evangelia Tsampali, Eirini‐Chrysanthi Tsardaka e Maria Stefanidou. "Hybrid protective coatings for construction steel bars". ce/papers 6, n. 5 (settembre 2023): 990–95. http://dx.doi.org/10.1002/cepa.2112.

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AbstractA hybrid‐based coating is proposed for its performance against accelerated corrosion of steel bars used for concrete reinforcement. The innovative, hybrid nano‐modified character of the coating is applied during steel's welding process (at around 400°C) ensuring durability and adhesion to the steel bars while energy saving is a necessary feature. With the intention of comparing product sustainability, both water‐based and organic solvent based polymeric matrix was used. Formulations were designed according to the final desired performance of the coating's behaviour and anti‐corrosion properties. For all the above complex formulations, an ultrasonic mixing method was applied, and all coatings have been sprayed. Final performance of coated steel was tested after exposing samples in salt mist, using sodium chloride solution (3.0% w/w) for 7 days. Detailed imaging modalities for metallic surfaces have been performed after testing samples under Scanning Electron Microscopy (SEM).
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Suleiman, Rami Mohammad. "Corrosion protective performance of epoxy-amino branched polydimethylsiloxane hybrid coatings on carbon steel". Anti-Corrosion Methods and Materials 62, n. 5 (7 settembre 2015): 334–40. http://dx.doi.org/10.1108/acmm-01-2014-1345.

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Purpose – The purpose of this paper was to prepare a hybrid organic/inorganic coating with interesting barrier properties against the corrosion of plain carbon steel sheets in 3.5 per cent NaCl solution. The search for replacing chromates in protective coatings has led to the development of hybrid sol-gel anticorrosive coatings. Appropriate functionalization can dramatically enhance the chemical durability and mechanical strength of these coatings. Design/methodology/approach – To prepare the targeted coating, 1,2-epoxybutane (EB) was mixed with 2 to 4 per cent aminoethylaminopropyl-methylsiloxane dimethylsiloxane (APDMS) copolymer and 1,6-diaminohexane. The above coating (EBAC) has been further mixed with three different corrosion inhibitors “Moly-white® 101-ED, Heucophos Zapp® and cerium ammonium nitrate”, yielding the coatings EBAC-M, EBAC-Z and EBAC-Ce, respectively. The corrosion characteristics of all coatings on the steel panels immersed in 3.5 per cent NaCl solution were obtained using different electrochemical methods such as electrochemical impedance spectroscopic and Tafel polarization measurements. Findings – The newly prepared coatings showed interesting protection properties for protecting the steel substrate against corrosion in chloride-containing media. Originality/value – The results provide a good approach for the modification of polydimethylsiloxane coatings using a simple organic modifier.
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Švadlena, J., e J. Stoulil. "Evaluation of protective properties of acrylate varnishes used for conservation of historical metal artefacts". Koroze a ochrana materialu 61, n. 1 (1 marzo 2017): 25–31. http://dx.doi.org/10.1515/kom-2017-0003.

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Abstract Acrylate varnishes are due to their suitable properties frequently used in restoration and preservation on variety of historical objects and materials. Common practice of their application involves using as an adhesive agents, consolidants and protective coatings. The purpose of protective coatings especially on metal artefacts is to reduce access of pollutants to the surface of the artefact. In this paper, coatings prepared from two acrylate polymers Paraloid B72 and Paraloid B48N are compared in terms of permeability for water and level of protective properties against air pollutants. For this purpose, electrochemical impedance spectroscopy and resistometric method were chosen for analysis of the coatings. Obtained results show lower permeability for water in case of Paraloid B72. However, same coating provided lower protection against air pollutants than Paraloid B48N coating.
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Merkulov, Vladimir, Gulnara Ulyeva, Gulzhainat Akhmetova e Andrey Volokitin. "SYNTHESIS OF COPOLYMERS FOR PROTECTIVE COATINGS". Journal of Chemical Technology and Metallurgy 59, n. 3 (7 maggio 2024): 639–46. http://dx.doi.org/10.59957/jctm.v59.i3.2024.18.

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Copolymers were obtained in this work and the methodology for their synthesis was worked out. Various fillers were selected for the polymer coating. Resulting copolymers have good adhesion required for composite protective coatings. An experiment was conducted to determine the corrosion resistance of metals coated with copolymers when exposed to aggressive environments, as well as to determine the hardness and thickness of the polymer coatings obtained. It was found that the polymer coating filled with bronze powder, despite the small thickness of 43.4 μm, hasthe best adhesion and corrosion properties, as well as having the highest hardness values of 80.5 HB. Such physical and mechanical properties of polymer coatings allow them to be used as protective coatings for metal products working under the influence of aggressive media.
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Latushkina, Svetlana D., Pavel V. Rudak, Dmitri V. Kuis, Oxana G. Rudak, Olga I. Posylkina, Olga Y. Piskunova, Ján Kováč, Jozef Krilek e Štefan Barcík. "Protective Woodcutting Tool Coatings". Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 64, n. 3 (2016): 835–39. http://dx.doi.org/10.11118/actaun201664030835.

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The modern woodworking industry applies resource-saving, environmentally appropriate technologies, providing both the metal removal performance enhancement and functioning with the optimal economic factors. Progressive cutting parameters require the application of the high-reliability cutting tools, eliminating machine-tool equipment standstill and increased cost of the expensive tool materials. In this paper it is suggested to increase the wood-cutting tool efficiency by means of the vacuum-arc separated coating deposition process optimization. The droplets are one of the main problems while generating vacuum-arc coatings, and they have a bad influence on the quality and operational coatings characteristics. The application of the separated system, allowing minimize the droplets content, is one of the most promising ways to solve this problem. Vacuum-arc deposition technique was used in this work to generate multicomponent coatings. The coatings deposition was directly carried out on the modernized vacuum-arc plant, equipped by Y-shaped macroparticles separator.
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Bonilla, Marjune Tamayo, Archie Gomera Ruda, Dave Joseph E. Estrada, Kurt Sterling M. Ubas, Aaron Andrew B. Mutia, Arnold A. Lubguban, Rey Y. Capangpangan et al. "Anti-Corrosion Properties of Polyaniline/Polyurethane Composite Coatings on Mild Steel Using Coconut-Based/PPG Blend Polyols". Solid State Phenomena 351 (27 ottobre 2023): 89–102. http://dx.doi.org/10.4028/p-l7lhcu.

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Polyurethane coating has been widely used as a protective coating due to its wide range of mechanical strength, excellent abrasion resistance, toughness, low-temperature flexibility, and chemical resistance, simplicity in production and application, and superior protection on corrosion to mild steel. No studies have been reported utilizing coconut-based/PPG blend polyols to produce polyurethane-based protective coatings on mild steel. Therefore, in this work, we fabricated polyurethane-based protective coating using coconut-based/PPG blend polyols for anti-corrosion application. Due to low adhesion strength of Polyurethane-based protective coating, the incorporation of nano-fillers into the polymer matrix improved the adhesion strength of the coating due to its functional benefits and its effects gave rise to increased intermolecular bonding, hydrogen bonding, van der waals, magnetism, and surface energy. Therefore, we fabricated PANI/PU composite coatings with varied amounts of polyaniline nanoparticles on mild steel using coconut-based/PPG blend polyols exposed in 3.5 wt% NaCl aqueous solution for anti-corrosion application. Characterizations like Fourier Transform Infrared Spectroscopy (FTIR), Potentiodynamic Polarization (Tafel plot), contact angle, adhesion test, FESEM, XRD, and UV-VIS were used in this study. Tafel plot revealed that PU-based and PANI/PU composite coatings exhibited a significant reduction in corrosion current density (Icorr), perhaps due to the adsorption of inhibitor in the surface of the mild steel which reduced corrosion rate of the metal by retarding the anodic process and impeding the corrosive species from the surroundings. Among all fabricated coatings, 0.5-PANI/PU composite coating was the best, having a less corrosion rate of 5.66x10-5 mmpy compared to others. In addition, its surface was more compact, smooth, rigid, and no voids present at the interface according to the result of FESEM, suggesting better corrosion protection to mild steel. Hence, PU-based protective coating and PANI/PU composite coatings using coconut-based/PPG blend polyols inhibited the penetration of the corrosive species and served as an adequate barrier protection against corrosion for mild steel.
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Elhamali, Suleiman Musa. "Synthesis of Plasma-Polymerized Toluene Coatings by Microwave Discharge". Al-Mukhtar Journal of Sciences 37, n. 4 (31 dicembre 2022): 365–71. http://dx.doi.org/10.54172/mjsc.v37i4.956.

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Plasma- polymerized coatings were successfully applied on aluminum alloy, AA2024, surface for corrosion protection. The plasma polymerization process was carried out by low pressure microwave plasma at room temperature. The effect of microwave plasma power on the corrosion resistance of polymer coatings was investigated using the potentiodynamic polarization technique. As the microwave plasma power increased, the relative protective efficiency increased. Polymer coatings on alloy surfaces suppressed both anodic and cathodic reactions. The increment in protective efficiency was due to a higher degree of cross-linking in the coating. These findings suggest that the toluene polymer coatings provide a considerable protection barrier for aluminum alloys.
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Tesi sul tema "Protective coatings"

1

Johnson, Brian W. "Ion transport through protective polymer coatings". Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293683.

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OZZELLO, ELENA DANIELA. "UV-cured fouling release acrylic coatings and protective coatings for clay bricks". Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2716632.

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The topic of this thesis is the protection of surface through UV cured polymeric coatings. In the first part coatings are designed to inhibit the adhesion of microorganisms on different substrate, while in the last chapter the coatings are developed to protect clay bricks from water. Degradation of surfaces caused by biofouling is a common issue in a variety of application, such as naval equipment, food industry and biomedical implants. In clay bricks, in addiction to biodegradation, the water causes other aesthetical and functional degradation phenomena, such as delamination, cracking, efflorescence, patina, black crusts. In this thesis was studied the growth of yeast in presence of different polymeric coatings prepared by UV curing. The approach followed was mainly based on the interfacial interactions between the surfaces and the microorganism. The experimental methods have been designed in order to control the physicochemical and mechanical properties of the surfaces. Interface interactions are governed by a variety of parameters, depending on the characteristic of both the substrate and the microorganism. Surface tension, hydration, wettability, roughness, topographies and elastic modulus and glass transition temperature are influent factors for polymeric materials. The microrganism selected for this works was a yeast isolated from garden soil and identified as Rhodotorula mucillaginosa. Rhodotorula species are ubiquitous, filmogenic, pigment yeasts. They are often called “pink yeast” because of the peculiar pink to orange coloration of the colonies. R. mucillaginosa and its adhesion properties are interesting in different application field. Selective and controlled proliferation of R. mucillaginosa could be useful in soil and wastewater bioremediation and industrial production of carotenoids. On the contrary, in biomedical application the biofilm formation in not desirable. Despite R. mucillaginosa generally is not harmful for human health, it is known as an emergent opportunistic pathogen able to infect immunosuppressed adults and newborns. Another important risk factor in infected patients is the presence of foreign bodies. Despite this, the Biosafety level of R. mucillaginosa is 1, this means that its manipulation in laboratory does not required special precautions. Coatings were prepared by UV-induced crosslinking processes. The UV curing or photopolymerization technique consists in the fast transformation of a liquid mixture of precursors into a solid crosslinked polymeric film. Low energy requirements, room temperature operation and solvent-free systems make UV curing an ecofriendly technology suitable for coatings industries. Monomers selected for the UV-curing process were characterized by acrylic end groups assuring fast and complete polymerization. For the protection of substrate against fouling, different monomers were selected in order to obtain coatings with different surface properties: 1. Hydrophobic monomers, i.e. perfluoropolyether diacrylates 2. Hydrophilic monomers, i.e. polyethilenglycol diacrylates. Hydrophobic coatings were based on perfuoropolyether (PFPE) diacrylic oligomer. It was studied the effect of surface tension, topography and elastic modulus on R. mucillagionosa adhesion and release. In Hydrophilic coatings were compared the effect of alkyl and poly(ethylene oxide) chain. The attention was focused on the effect of different chemical compositions, and thus different surface tension, on the induced morphology of R. mucillaginosa. Properties of acrylic coating have been checked by water absorption, contact angle measurement, profilometry and dynamic mechanical thermal analysis (DMTA). The interaction between the coatings and the yeast cells were examined through a simple in vitro test and correlated to the material properties of the polymers. The yeast test was designed to monitor the growth of R. mucillaginosa and the potential biofilm formation in presence of acrylic coatings. Biofilm release by a gentle washing was also evaluated. During the test, cell density was measure by UV visible spectroscopy. The growth morphology of the yeast on the coatings surface was observed by optical microscopy and FESEM. In addition, the effect of uncured monomers and the photoinitiator on the microorganism growth was studied. The coatings under investigation showed a different fouling behavior. The interaction between yeast cells and the coating surface appreciably change, mainly driven from the surface tension and the hydration of the materials. Different yeast morphologies were found. In the second part of the thesis are presented two hybrid coating as protective coating for clay bricks: a waterborne polyurethane coating and a perfluorinated (PFPE) coating. Masonry is susceptible from aesthetic and functional deterioration due to atmospheric agents, pollution and microorganism. The most diffuse degradations of facing bricks are lacunas, pulverization, delamination, cracking, presence of efflorescence, patina, black crusts and dissolution and leaching of mortar between brick courses. Water is known as an important factor of degradation; thus, hydrophobic coatings is an effective way to preserve bricks. The main characteristic required to this coating are hinder the liquid water absorption but maintain the water vapor transmission in the substrate. Protective coating for building porous materials are divided in two main categories: film formers and penetrants. The first coating presented in this thesis is a polyurethane based film formers coatings. It was prepared by combining two ecofriendly process: UV-curing of a waterborne diacrylic polyurethane and sol-gel reaction of a Tetraethoxysilane (TEOS). The perfluorinated coating is penetrants and was obtained by a sol-gel reaction of an α–ω-terminated triethoxysilane PFPE. Hybrid PFPE was obtaind using the sol-gel process in the presence of TEOS. Coated and uncoated facing bricks were compared by scanning electron microscopy, surface profilometry, water wettability and capillary rise tests. The hybrid coating acts as a moderate water repellent: interestingly no appreciable alteration of the aesthetical properties of the brick was observed, in particular no gloss and color change appeared after the treatment. Both the proposed coating could be applied on brick in the manufacturing process, or on existing brickwork.
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Wright, J. D. "Impedance studies of water based protective coatings". Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386702.

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Wakeham, Steve. "Protective, antireflection coatings for multispectral zinc sulphide". Thesis, University of Reading, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402630.

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D'ISANTO, FABIANA. "New oxidation protective coatings for thermoelectric materials". Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2839858.

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Mahfoudhi, Marouen. "Numerical optimisation of electron beam physical vapor deposition coatings for arbitrarily shaped surfaces". Thesis, Cape Peninsula University of Technology, 2015. http://hdl.handle.net/20.500.11838/2225.

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Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology.
For the last few decades, methods to improve the engine efficiency and reduce the fuel consumption of jet engines have received increased attention. One of the solutions is to increase the operating temperature in order to increase the exhaust gas temperature, resulting in an increased engine power. However, this approach can be degrading for some engine parts such as turbine blades, which are required to operate in a very hostile environment (at ≈ 90% of their melting point temperature). Thus, an additional treatment must be carried out to protect these parts from corrosion, oxidation and erosion, as well as to maintain the substrate’s mechanical properties which can be modified by the high temperatures to which these parts are exposed. Coating, as the most known protection method, has been used for the last few decades to protect aircraft engine parts. According to Wolfe and Co-workers [1], 75% of all engine components are now coated. The most promising studies show that the thermal barrier coating (TBC) is the best adapted coating system for these high temperature applications. TBC is defined as a fine layer of material (generally ceramic or metallic material or both) directly deposited on the surface of the part In order to create a separation between the substrate and the environment to reduce the effect of the temperature aggression. However, the application of TBCs on surfaces of components presents a challenge in terms of the consistency of the thickness of the layer. This is due to the nature of the processes used to apply these coatings. It has been found that variations in the coating thickness can affect the thermodynamic performance of turbine blades as well as lead to premature damage due to higher thermal gradients in certain sections of the blade. Thus, it is necessary to optimise the thickness distribution of the coating.
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Vyawahare, Siddharth M. Ahmed Ikram. "Protective thermal spray coatings for polymer matrix composites". Diss., A link to full text of this thesis in SOAR, 2006. http://soar.wichita.edu/dspace/handle/10057/684.

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Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering.
"December 2006." Title from PDF title page (viewed on Sept. 18, 2007). Thesis adviser: Ikram Ahmed. Includes bibliographic references (leaves 79-81).
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Shen, Hao. "A study of active fillers in protective coatings". Thesis, University of Essex, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304467.

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Close, Damien. "Alternative protective coatings for hot stamped automotive body parts". Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0083/document.

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De nombreux revêtements sont actuellement disponibles pour les aciers emboutis à chaud et trempés pour le domaine de la construction automobile. Afin d’augmenter les performances des produits actuels en termes d’aptitude à la mise en forme à chaud, de résistance contre la corrosion et de compatibilité avec les procédés de fabrication ultérieurs, les constructeurs automobiles et les sidérurgistes ont développé de nombreux types de matériaux alternatifs. Peu de produits ont trouvé une place importante dans l’utilisation industrielle. L’objectif de ce travail est de procéder à une vue d’ensemble des performances des produits actuels, d’identifier de nouveaux concepts de revêtements et d’étudier leur compatibilité pour l’application de la mise en forme à chaud. Cette étude porte sur les revêtements d’alliages de Zn-Mn. De nombreux bains électrolytiques et paramètres électriques ont été étudiés afin de déterminer des conditions de déposition optimales pour obtenir des alliages Zn-Mn avec une forte teneur en Mn. Les propriétés cristallographiques, microstructurales et anticorrosives de couches obtenues sur des plaques d’acier de grandes dimensions ont été caractérisées avec de nombreuses techniques. La compatibilité des couches protectrices pour le traitement d’austénitisation a été évaluée après des traitements thermiques à différentes températures et durées de chauffe. Une attention particulière a été portée sur l’évolution de la composition et des phases d’interdiffusion formées, ainsi que sur l’apparition de mécanismes d’oxydation et d’évaporation à haute température. Enfin, l’aptitude à la mise en forme à chaud et notamment la susceptibilité à la fissuration par métaux liquides de ces nouveaux revêtements ont été évaluées par des essais d’emboutissage
Various coatings are currently available for press-hardened steels used for the automotive construction, mainly with the aim of providing good anticorrosive properties to the body components. In order to improve performance of the coated products in terms of hot formability, corrosion protection and suitability for subsequent manufacturing processes, steelmakers and car manufacturers investigated various alternative coating materials. Only a few solutions resulted in a serial production. The aim of this study is to proceed to a screening of the performance of current coating variants, to identify new concepts for alternative coating materials and assess their suitability for the hot stamping application. The present work is focused on the study of Zn-Mn alloy coatings. Various electroplating baths and electric parameters were studied in order to determine optimal deposition conditions for obtaining Zn-Mn alloys with high Mn contents. The deposits obtained on large-scale steel plates were characterized with regards to their crystallographic, microstructural and anticorrosive properties. The behavior of the coating materials during austenitizing treatment was studied after heat treatment to different temperatures and heating durations. A particular attention was given to the evolution of the composition, the interdiffusion phases formed as well as to the presence of oxidation and evaporation mechanisms at high temperature. At last, the forming properties of the alternative coating materials and their susceptibility for liquid metal embrittlement were assessed on the basis of direct hot stamping experiments
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Geromel, Prette Andre Luiz. "Sintering of Co2MnO4 spinel for protective coatings in SOFC". Doctoral thesis, Università degli studi di Trento, 2011. https://hdl.handle.net/11572/367848.

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Protective coatings are often deposited on SOFC interconnectors to avoid poisoning of cathode from chromium species that evaporate from stainless steel interconnects or supports. Co2MnO4 spinel compounds are usually considered as the main constituent of protection barriers. Nevertheless, such ceramic sinters at high temperatures (>1200°C) and this can be problematic for the properties of the stainless steel components. One of the major issues is, in fact, the creation of a compact and impermeable coating at relatively low temperature in order to preserve the metal substrate. In the present research work, Co2MnO4 spinel was synthesized by various methods (solid-state, gel-combustion, co-precipitation and reverse micelle) and the obtained specific surface area, structure and particle size were correlated with thermal behaviour, sintering temperature and achieved density. It was found that regardless the synthesis process the only obtained phase is Co2MnO4. Specific surface area from 0,8 to 65 m2g-1 was obtained, depending on the synthesis method. Sintering aids such as Nb2O5 and LiF were used to obtain dense microstructure at relatively low temperature. Considerable changes in sintering temperature were observed this being even 100-200ºC lower than that necessary for the consolidation of pure spinel though microstructure with only close pores was achieved. A novel sintering method based on Field Assisted Techniques (FAST) that promoted flash-sintering phenomenon was finally applied to Co2MnO4. Small electric field (<7,5 V cm-1) applied to the spinel decreases the sintering temperature down to 600°C. The application of an electric field above 7,5 V cm-1 flash-sintering phenomenon takes place and sintering temperature drops to about 300°C, the sintering time being less than 1 second.
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Più fonti

Libri sul tema "Protective coatings"

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

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Wen, Mei, e Karel Dušek, a cura di. Protective Coatings. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51627-1.

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

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4

Munger, Charles G. Corrosion protection by protective coatings. 2a ed. Houston, TX: National Association of Corrosion Engineers, 1999.

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Hughes, Anthony E., Johannes M. C. Mol, Mikhail L. Zheludkevich e Rudolph G. Buchheit, a cura di. Active Protective Coatings. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-7540-3.

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Jane, Blunt, e Grainger Stan, a cura di. Engineering coatings: Design and application. 2a ed. Norwich, NY: William Andrew Publishing, 1998.

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Zhang, Sam, Jyh-Ming Ting e Wan-Yu Wu. Protective Thin Coatings Technology. New York: CRC Press, 2021. http://dx.doi.org/10.1201/9781003088349.

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1961-, Zarras Peter, American Chemical Society. Division of Polymer Chemistry e American Chemical Society. Division of Polymeric Materials: Science and Engineering, a cura di. New developments in coatings technology. Washington, DC: American Chemical Society, 2006.

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Bleile, Henry R. Marine coatings. Philadelphia, PA: Federation of Societies for Coatings Technology, 1989.

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Pauleau, Yves, e Péter B. Barna, a cura di. Protective Coatings and Thin Films. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5644-8.

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Capitoli di libri sul tema "Protective coatings"

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Bradford, Samuel A. "Protective Coatings". In Corrosion Control, 214–34. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4684-8845-6_10.

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Gooch, Jan W. "Protective Coatings". In Encyclopedic Dictionary of Polymers, 594. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9546.

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Dušek, Karel, Jos Huybrechts e Miroslava Dušková-Smrčková. "Role of Distributions in Binders and Curatives and Their Effect on Network Evolution and Structure". In Protective Coatings, 3–37. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51627-1_1.

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Price, Kyle, Wenjun Wu, Alon V. McCormick e Lorraine F. Francis. "Measurements of Stress Development in Latex Coatings". In Protective Coatings, 225–40. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51627-1_10.

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Zelenka, Jiří, Karel Dušek e Mei Wen. "Stress Development in Reactive Coatings". In Protective Coatings, 241–67. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51627-1_11.

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Dušek, Karel, Miroslava Dušková-Smrčková e C. Brent Douglas. "Swelling of Coating Films". In Protective Coatings, 271–91. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51627-1_12.

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Adamsons, Karlis, e Mei Wen. "Chemical Depth Profiling of a Multilayer Coating System Using Slab Microtomy and FTIR-ATR Analysis". In Protective Coatings, 293–312. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51627-1_13.

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Wu, Wenjun, Dana Garcia e Steve Severtson. "Characterization of Component Distributions in Acrylic Latex and Paint Films Containing an Alkali-Soluble Resin (ASR)". In Protective Coatings, 313–31. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51627-1_14.

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Blackman, Gregory S., Michael T. Pottiger, Benjamin W. Foltz, Jing Li, Ted Diehl e Mei Wen. "Advances in NanoScratch Testing of Automotive Clearcoats". In Protective Coatings, 333–59. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51627-1_15.

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Lin, Jun. "Scratch and Mar Resistance of Automotive Coatings". In Protective Coatings, 361–76. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51627-1_16.

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Atti di convegni sul tema "Protective coatings"

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Diccar, U. V., I. Ahmed, S. M. Vyawahare e G. Talia. "Protective Coatings for Polymer Composites". In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16193.

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Abstract (sommario):
Thermal spray coating is being studied as one of the techniques used for coating graphite reinforced polymer composites, which are extensively used in the aviation industry. These coatings are studied for improvement of surface properties such as erosion resistance, UV protection, property retention and electro magnetic shielding. NiAl (63:35) (65%Ni,35%Al) intermetallic, NiAl (95:5) (95%Ni,5%Al), Aluminum and Zinc coating were thermal-spray deposited using different procedures (plasma, flame, electric wire arc) onto composite specimens. Two categories of coating were evaluated: Coatings with bond coating and coatings without bond coating. These coatings were tested for protection against erosion encountered by aircraft components. The microstructures and micro-hardness of these coatings were determined. The bond strength between the substrate and the coating layer was evaluated by means of adhesion tests. The results obtained are discussed, with special attention being paid to the specific characteristics of the different spraying procedures.
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Askinazi, Joel, e Authi A. Narayanan. "Protective broadband window coatings". In AeroSense '97, a cura di Randal W. Tustison. SPIE, 1997. http://dx.doi.org/10.1117/12.277060.

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Bortsov, Sergey U., Irina B. Kirienko, Vecheslav I. Kirillov e Vladimir A. Nadolinnyj. "Micro-plasma Protective Coatings". In 2007 8th Siberian Russian Workshop and Tutorial on Electron Devices and Materials. IEEE, 2007. http://dx.doi.org/10.1109/sibedm.2007.4292916.

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Tustison, Randal W. "Protective, infrared transparent coatings". In Critical Review Collection, a cura di Ric P. Shimshock. SPIE, 1992. http://dx.doi.org/10.1117/12.58697.

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Yang, Quan, Kaustubh Chitre, Tolulope O. Salami, Scott R. Oliver e Junghyun Cho. "Development of Protective Coatings for Silicon Devices". In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41700.

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Ceramic coatings can be effectively used as a surface protective layer for silicon-based devices due to their inertness and good mechanical properties. One challenge is to avoid the weaknesses that ceramic coatings inherently possess, i.e., low strain tolerance, brittleness, high temperature required to process the film, and difficulty to produce a uniform, dense layer. Therefore, in an attempt to process strain-tolerant ceramic coatings at low temperatures, we develop an aqueous solution precursor processing route. Nanometer scale organic coatings, fabricated by self-assembly processes on the silicon, are used as a ‘template’ to aid the subsequent deposition of hard ceramic coatings (ZrO2). The ceramic coatings are deposited by spin coating. The organic self-assembled monolayer (SAM) coating provides temporary strain tolerance for the overlying hard coating upon mechanical and thermomechanical stresses before being decomposed at high temperatures. Molecular level understanding of the coating microstructure and micromechanics involved in the coating processes is systematically approached via experimental tools such as AFM and nanoindenter, as well as numerical simulation.
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Surdutovich, G. I., R. Z. Vitlina e V. Baranauskas. "Anisotropic Protective Coating for Brewster-Angle Windows". In Optical Interference Coatings. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/oic.1998.wf.2.

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Usually any anti-corrosion protective coating worsens to some extent the optical properties of the object. This is also related as well to Brewster-angle windows since the null reflectivity at the Brewster angle is a property of a flat interface between two lossless dielectrics, which can never be obtained with an isotropic film-covered substrate. It is possible, however, to design some specialized anisotropic coatings deposited onto the Brewster angle window which sustain exactly the position of the Brewster angle and a true zero of the reflection factor.
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Khobaib, Mohammad, Jochen Hoffmann, Shamachary Sathish e Michael S. Donley. "Study of Corrosion Damage Under Protective Coatings". In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/nde-25818.

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Abstract Polymer coatings provide an excellent corrosion barrier for Al-skinned military aircraft. However, the degradation and damage of the coatings in their service life over time leads to the initiation of corrosion damage at the substrate level. Early detection and negation of such activity can provide extensive cost savings. Several Electrochemical techniques and Non Destructive Evaluation (NDE) show promise in detecting the onset of corrosion under such coatings. Current accelerated testing of aircraft coating systems for corrosion protection relies heavily on salt spray methods. Electrochemical techniques such as Electrochemical Impedance Spectroscopy (EIS) and Electrochemical Noise Methods (ENM) provide insight into the global properties of a coating system, and both techniques are being used on a limited basis. However, there is a need to investigate corrosion events with greater spatial resolution under coatings at the metal/coating interface. Such corrosion activity may be related to coating defects and variations in the surface chemistry of the underlying metal. The Scanning Vibrating Electrode Technique (SVET) has been developed to allow the investigation of localized corrosion activity with high spatial resolution. Such activity may be associated with coating defects or galvanic coupled regions of the metal surface. Electrochemical and NDE techniques were used to investigate the early stage of corrosion activity under protective coatings. Coatings in this investigation ranged from a simple epoxy amine to commercially used military aircraft polyurethane coatings. SVET testing of panels with intact high-resistance barrier coatings could not reveal corrosion damage under normal testing conditions because of little or no corrosion activity within the limited exposure time. Chemical, mechanical, and electrochemical means of accelerating the corrosion damage were utilized to obtain results in a reasonable time frame. Corrosion initiation and its progress under the coating were studied in detail and the results are discussed here. Complimentary high-resolution NDE techniques, such as Scanning Acoustic Microscopy (SAM) and Fan Thermography measurements were used to identify the corrosion sites. The overall objective of this investigation is to establish a correlation between the electrochemical and NDE techniques.
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Zhou, Qixin, e Yechun Wang. "Flow Accelerated Degradation of Corrosion Protective Organic Coatings". In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63727.

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Water percolation into coating-metal interface is usually the main cause for the deterioration of corrosion protective property of organic coatings, which leads to coating delamination and under film corrosion. Recently, flowing fluid has received attention due to its capability to accelerate the degradation of materials. A plethora of works have focused on the corrosion of metallic materials accelerated by the flow of working fluids, while few studies have investigated the flow accelerated degrading behavior of organic coatings. For organic coatings, flowing fluid above the coating surface affects corrosion by enhancing the water percolation and by abrading the surface due to wall shear stress. Hence, it is of great importance to understand the influence of flowing fluids on the degradation of corrosion protective organic coatings. In this study, a commercially available epoxy based clear coating and pigmented marine coating were exposed to the laminar flow as well as stationary immersion. The laminar flow was pressure driven and confined in a newly designed flow channel. A 3.5 wt% sodium chloride solution was employed as the working fluid with a variety of flow rates. The corrosion protective properties of organic coatings were monitored inline by Electrochemical Impedance Spectroscopy (EIS) measurement. Equivalent circuit models were employed to interpret the EIS spectra. The time evolution of coating resistance and capacitance obtained from the model was studied to demonstrate the coating degradation. Thickness, gloss, and other topography characterizations were conducted to facilitate the assessment of the corrosion. The immersing solutions were measured by pH and conductivity meters as well as Fourier Transform Infrared Spectrometer (FTIR) to trace coating degradation products as they leached out from the coating. Initial attempts to acquire acceleration factors and predict service lifetime of organic coatings were also conducted.
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Pirich, Ronald. "Contamination protective coatings: an overview". In SPIE Optical Engineering + Applications, a cura di Edward W. Taylor e David A. Cardimona. SPIE, 2013. http://dx.doi.org/10.1117/12.2024306.

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Schulz, Ulrike, Kerstin Lau e Norbert Kaiser. "Antireflection Coating AR-Hard with UV-Protective Properties for Polycarbonate". In Optical Interference Coatings. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/oic.2007.thd4.

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Rapporti di organizzazioni sul tema "Protective coatings"

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Schulz, Douglas L., Gregory J. McCarthy, Mark Horn, Paul Sunal, Russel Messier, Robert W. Collins, Chi Chen, Gary McGuire e Mark Ray. Nanostructured Protective Coatings. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2006. http://dx.doi.org/10.21236/ada446194.

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NAGY, KATHRYN L., RANDALL T. CYGAN, C. JEFFREY BRINKER e ALAN SELLINGER. Protective coatings for concrete. Office of Scientific and Technical Information (OSTI), maggio 2000. http://dx.doi.org/10.2172/756038.

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Chesonis, Kestutis G., e Pauline M. Smith. Formulating Multifunctional Protective Ammunition Coatings. Fort Belvoir, VA: Defense Technical Information Center, agosto 2002. http://dx.doi.org/10.21236/ada407680.

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Vanier, P. E., R. Barletta, J. Adams e J. Svandrlik. Testing of protective coatings in hydrogen. Office of Scientific and Technical Information (OSTI), luglio 1993. http://dx.doi.org/10.2172/10181836.

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Nguyen, T., B. Collins, L. Kaetzel, J. Martin e M. McKnight. Relationship between appearance and protective durability and coatings:. Gaithersburg, MD: National Bureau of Standards, 1988. http://dx.doi.org/10.6028/nist.ir.88-4010.

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Hendrick, Michelle. Low-Cost Protective Layer Coatings on Thermal Barrier Coatings via CCVD. Final Report. Office of Scientific and Technical Information (OSTI), settembre 2003. http://dx.doi.org/10.2172/821712.

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Amarendra K. Rai. DEVELOPMENT OF PROTECTIVE COATINGS FOR SINGLE CRYSTAL TURBINE BLADES. Office of Scientific and Technical Information (OSTI), dicembre 2006. http://dx.doi.org/10.2172/895828.

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Bierwagen, Gordon, e Yaping Huang. Development of Protective Coatings for Co-Sequestration Processes and Pipelines. Office of Scientific and Technical Information (OSTI), novembre 2011. http://dx.doi.org/10.2172/1053783.

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Lin, Changjian. An electrochemical technique for rapidly evaluating protective coatings on metals. Gaithersburg, MD: National Bureau of Standards, 1988. http://dx.doi.org/10.6028/nist.tn.1253.

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Matson, Dean W., Edwin D. McClanahan, Sabrina L. Lee e Donald Windover. Properties of Thick Sputtered Tantalum Used for Protective Gun Tube Coatings. Fort Belvoir, VA: Defense Technical Information Center, ottobre 2001. http://dx.doi.org/10.21236/ada396298.

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