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Optimization and performance analysis of copper immersion coating on AZ91 magnesium alloy / Lianxi Yang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 6 (04/2005)
[article]
Titre : Optimization and performance analysis of copper immersion coating on AZ91 magnesium alloy Type de document : texte imprimé Auteurs : Lianxi Yang, Auteur ; Ben Luan, Auteur ; Woo-Jae Cheong, Auteur ; Jiaren Jiang, Auteur Année de publication : 2005 Article en page(s) : p. 493-498 Note générale : Bibliogr. Langues : Américain (ame) Tags : Métallisation Etude expérimentale Couche protectrice anticorrosion Matériau revêtement Plan expérience Condition mise en oeuvre Dépôt immersion Attaque chimique Traitement surface Magnésium alliage Cuivrage Optimisation Index. décimale : 667.9 Revêtements et enduits Résumé : An orthogonal experimental methodology was used to study a copper immersion coating on AZ91 magnesium alloy from a hydrofluoric acid-containing bath. Factors such as hydrofluoric acid concentration, sonication time, chemical etching, and activation process were considered in the design. The analysis of variance on the orthogonal experimental results was performed, resulting in an optimal condition for achieving a uniform copper coating with high coverage. Hydrofluoric acid was found to be an essential component in the copper immersion coating bath and a possible mechanism was suggested to explain its significance in terms of magnesium film destruction and magnesium dissolution. DOI : 10.1007/BF02733892 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02733892.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3844
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 6 (04/2005) . - p. 493-498[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001483 - Périodique Bibliothèque principale Documentaires Disponible Effects of reaction conditions on the formation of poly(2-vinylpyridine) coatings by electropolymerization / Xiaoping Ling in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 908 (09/2000)
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Titre : Effects of reaction conditions on the formation of poly(2-vinylpyridine) coatings by electropolymerization Type de document : texte imprimé Auteurs : Xiaoping Ling, Auteur ; Mark D. Pritzker, Auteur ; Charles M. Burns, Auteur ; John J. Byerley Année de publication : 2000 Article en page(s) : p. 71-80 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau revêtement Procédé Polymérisation électrolytique Pyridine(2-vinyl)polymère Pyridine(2-vinyl)copolymère Formation film Couche protectrice anticorrosion Acier doux Condition opératoire Etude expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : The effects of reaction conditions on the formation of poly(2-vinylpyridine) coatings on mild steel by electropolymerization have been investigated. Over the ranges studied, the relative effects of these reaction conditions on the weight of the coating produced is found to decrease as follows : monomer concentration > solution pH > methanol concentration > solution temperature. The optimum conditions for coating formation are to use a solution with a composition of 0.25 M 2-vinylpyridine, 15 vol% methanol, and pH 5.0 at a temperature of 20 °C. If the monomer concentration is too high, the coating formed is soft and tacky; if it is too low, a thin and non-uniform coating is produced. Methanol concentrations between 15 and 25 vol% are required to produce uniform and thick films. Coating weights decrease at electropolymerization temperatures above 40°C, presumably due to an increase in polymer solubility. The polymer films become thicker and more uniform as electrolysis continues up to two hours. Ammonium perchlorate is found to be the most suitable electrolyte for the process, although its actual concentration has little impact on film quality. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5789
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Code-barres Cote Support Localisation Section Disponibilité 001213 - Périodique Bibliothèque principale Documentaires Disponible Hydrothermal degradation study of phenolic polymer coatings by advanced analytical methods / T. Sugama in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 917 (06/2001)
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Titre : Hydrothermal degradation study of phenolic polymer coatings by advanced analytical methods Type de document : texte imprimé Auteurs : T. Sugama, Auteur ; S. S. Kelley, Auteur ; K. Gawlik, Auteur Année de publication : 2001 Article en page(s) : p. 65-71 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau revêtement Peinture anticorrosion Dégradation chimique Feuil Condition hydrothermale Phénoplaste Oxydation Acier Réaction interface Etude expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : Resole-type phenolic polymer coatings were deposited on carbon steel panels, and then were exposed for 15 days to a simulated geothermal brine with pH 1.6 at 150°, 175°, and 200°C. The phenolic polymers were hydrothermally oxidized. To comprehensively understand the mechanisms of this oxidative degradation of the coatings, the modern analytical techniques of XPS, contact angle, TGA, SEM-EDX, and EIS were used in combination. The oxidative degradation of polymer took place in the three-step oxidation routes: first, the bridging methylen linkages in the network polymer structure were replaced by the benzylhydrol-type linkages ; second,the benzylhydrol-type linkages were transformed into the benzophenone-type linkages ; and finally, the C-C-C linkage in the benzophenone derivative ruptured to form salicylic acid derivative as the ultimate degradation products. Hydrothermal temperatures of >175°C promoted the degree of such oxidation degradation, causing the coating surface to become susceptible to moisture, to absorb more brine, and also to allow corrosive electrolytes to permeate easily. Consequently, iron oxides as the corrosion products from the underlying steel were yielded at a critical interfacial zone between the coat. The excessive growth of iron oxides led to the generation of internal stress-induced cracks in the coating film, thereby resulting in the failure of these corrosion-preventing barriers. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5735
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Code-barres Cote Support Localisation Section Disponibilité 001225 - Périodique Bibliothèque principale Documentaires Disponible