Photogenerated cathodic protection and invalidation of silane/TiO2 hybrid coatings / Weiwei Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 2 (03/2017) . - p. 417-424 Titre : Photogenerated cathodic protection and invalidation of silane/TiO2 hybrid coatings Type de document : texte imprimé Auteurs : Weiwei Zhang, Auteur ; Hanlin Guo, Auteur ; Haiqing Sun, Auteur ; Rong-Chang Zeng, Auteur Année de publication : 2017 Article en page(s) : p. 417-424 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable Analyse électrochimique Anticorrosifs Anticorrosion Corrosion Dioxyde de titane Essais accélérés (technologie) Matériaux hybrides Métaux -- Revêtements protecteurs Protection cathodique Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : Silane/TiO2 hybrid coatings were prepared on 304 stainless steel (304 SS) by a simple dipping method, where the silane is d-γ-methylacryloxy propyl trimethoxyl silane (CH2=C(CH3)COO(CH2)3Si(OCH3)3, MPMS). The photogenerated cathodic protection and invalidation of the hybrid coatings were evaluated by microstructure and electrochemical characterization. The coupling agent MPMS reduced the agglomeration of the nanosized TiO2 powders and promoted the adhesion of the coatings. Barrier protection of the coupled metal was promoted for the hybrid coatings in a short corrosion time. However, MPMS decreased the carrier concentration of the TiO2 electrode due to the large interface resistance. As a result, the corrosion potential shifted positively and the photogenerated cathodic protection decreased. In long-time corrosion, the hybrid coatings became invalid because of the accumulation of electropositive holes that may weaken the Ti–O bond and destroy the barrier effect. Note de contenu : - EXPERIMENTAL MATERIALS AND METHODS : Preparation of TiO2 powders - Preparation of silane/TiO2 hybrid coatings - Characterization - Measurements of photoelectrochemical performance - RESULTS AND DISCUSSION : Composition and microstructure of coatings - Analysis of electrochemical measurement - Corrosion test results DOI : 10.1007/s11998-016-9859-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9859-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28156 [article]

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