Comparative study on the degradation of a zinc-rich epoxy primer/acrylic polyurethane coating in different simulated atmospheric solutions / Wei Sun in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 397–413 Titre : Comparative study on the degradation of a zinc-rich epoxy primer/acrylic polyurethane coating in different simulated atmospheric solutions Type de document : texte imprimé Auteurs : Wei Sun, Auteur ; Chao Xing, Auteur ; Xiaobo Tang, Auteur ; Yu Zuo, Auteur ; Yuming Tang, Auteur ; Xuhui Zhao, Auteur Année de publication : 2021 Article en page(s) : p. 397–413 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Atmosphère marine Copolymère uréthane acrylique Corrosion Epoxydes Primaire (revêtement) Revêtements -- Détérioration Revêtements organiques Spectroscopie d'impédance électrochimique Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : The degradation of a zinc-rich epoxy primer/acrylic polyurethane coating system on carbon steel was studied in the simulated marine atmospheric solution (0.05% NaCl), industrial atmospheric solution (0.35% (NH4)2SO4), and marine-industrial atmospheric solution (0.05% NaCl + 0.35% (NH4)2SO4), by electrochemical impedance spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy methods. The influences of the soluble contaminants in the atmospheres, including chloride ions, sulfate ions, and ammonium ions, on the coating failure mechanism were compared and analyzed. The results showed that the degradation speed of the coating system in three simulated atmospheric solutions is in the following order: simulated marine atmosphere > simulated marine-industrial atmosphere > simulated industrial atmosphere. The degradation is mainly related to the permeation rate of the water through the coating. The aggressive ions, basic cations, and the property of the corrosion products also have influences on the degradation process. The alternating temperature environment (45°C 12 h + 25°C 12 h) could increase the degradation speed of the coating and the difference of the speed in the three solutions. Note de contenu : - EXPERIMENTAL : Materials and samples preparation - Corrosion tests and measurements - - RESULTS AND DISCUSSION : EIS results and the morphology of the coatings - FTIR results and SEM morphology of the coatings - Table 1 : Coating specifications - Table 2 : The impedance parameters of the coating sample in 0.05% NaCl solution under alternating hot and cold temperature condition - Table 3 : The impedance parameters of the coating sample in 0.35% (NH4)2SO4 solution under alternating hot and cold temperature condition - Table 4: The impedance parameters of the coating sample in 0.05% NaCl + 0.35% (NH4)2SO4 solution under alternating hot and cold temperature condition DOI : https://doi.org/10.1007/s11998-020-00410-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00410-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35603 [article]

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