The particle size effect of MALPB-DEA dispersions on their anticorrosion performances as waterborne coatings on galvanized sheet / Jinwei Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 1 (01/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 1 (01/2011) . - p. 11-17 Titre : The particle size effect of MALPB-DEA dispersions on their anticorrosion performances as waterborne coatings on galvanized sheet Type de document : texte imprimé Auteurs : Jinwei Wang, Auteur ; Jinwei Tang, Auteur ; Yedong He, Auteur Année de publication : 2011 Article en page(s) : p. 11-17 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anhydride maléique Anticorrosifs Anticorrosion Diéthanolamine Dispersions et suspensions Galvanisation Polybutadiène Polymères en émulsion Revêtements en phase aqueuse:Peinture en phase aqueuse Taille des particules Index. décimale : 667.9 Revêtements et enduits Résumé : Maleic anhydride-g-liquid polybutadiene (MALPB) dispersions were prepared by chemical modification with diethanolamine (DEA) during direct polymer emulsification, and their anticorrosion performances on galvanized sheet were found to be strongly dependent on their particle size and distribution with the variation of DEA. The dispersion containing DEA to maleic anhydride at molar ratio of 2:1 exhibited much smaller particle size and narrower size distribution than that containing DEA to maleic anhydride at molar ratio of 1:1, as measured by a laser diffraction particle size analyzer. A more compact organic layer was supposed to be formed by the dispersion composed of smaller size and narrower size distribution particles on the galvanized sheet, which exhibited better anticorrosive properties. This compact layer slowed down the electrolyte penetration onto the metal surface such that the life span of the metal could be prolonged, which was reflected in the increase in corrosion potential as measured by DC polarization, higher impedance during immersion in 3.5 wt% NaCl solution as measured by electrochemical impedance spectroscopy (EIS), and improved durability in harsh environment as observed by images after salt spray tests. Note de contenu : EXPERIMENTAL : Materials - Preparation of the coatings - Film formation and the curing process - Characterizations. RESULTS AND DISCUSSION : Particle size and distributions of the dispersions - Electrochemical impedance spectroscopy (EIS) - Salt spray test. DOI : 10.1007/s11998-010-9268-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9268-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10918 [article]

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Top coating of low-molecular weight polymer MALPB used for enhanced protection on anodized AZ31B Mg alloys / Jinwei Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 6 (11/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 6 (11/2010) . - p. 737-746 Titre : Top coating of low-molecular weight polymer MALPB used for enhanced protection on anodized AZ31B Mg alloys Type de document : texte imprimé Auteurs : Jinwei Wang, Auteur ; Jinwei Tang, Auteur ; Yedong He, Auteur Année de publication : 2010 Article en page(s) : p. 737-746 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anhydride maléique Anticorrosifs Anticorrosion Magnésium -- Alliages Métaux -- Oxydation anodique Microscopie électronique à balayage Polybutadiène Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : A protective composite coating on an AZ31B magnesium alloy was prepared by anodic oxidation to form an oxide layer, followed by single immersion in maleic anhydride-g-liquid polybutadiene (MALPB) solution to cover a polymer coating on top. As a low-molecular weight polymer with low viscosity, MALPB had a tendency to infiltrate into the pores and cracks in the anodic layer to fill the defects among oxides so that a compact layer could be formed after it was cured by its hardeners, as observed by scanning electron microscopy (SEM). This compact layer, which was composed of anodic oxides integrated with solidified MALPB, possessed thickness around 0.7 μm as detected by energy dispersive X-ray (EDX). The anodized, MALPB-coated AZ31B alloy exhibited enhancement in corrosion resistance superior to that separately coated by anodizing oxides or MALPB, as reflected by its much higher corrosion potentials (E ccor) and lower corrosion current density (i corr) in DC polarization tests. Based on electrochemical impedance spectroscopy (EIS) data, we conclude that the anticorrosive performance of the composite coating can be attributed to the barrier effects provided by different layers when the electrolyte passed through the MALPB layer, compact layer, and then the inner anodic layer before it reached the surface of Mg alloy, and that among them, the compact layer acted as a much more effective barrier to the electrolyte. The appearance of damaged areas on the composite coating surface after a much longer duration in a salt spray environment revealed that the life-span of the AZ31B Mg alloy could be greatly prolonged if the pores and cracks on the anodizing films were properly sealed by suitable polymers. DOI : 10.1007/s11998-010-9258-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9258-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10401 [article]

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