Performance of composite coating on AZ31B magnesium alloy prepared by anodic polarization and electroless electrophoresis coating

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• 作者：Zhengwei Song^a ; Gang Yu^a ; ^{yuganghnu@163.com" class="auth_mail} ; Zhihui Xie^a ; Bonian Hu^b ; ^{hbonian@yahoo.com.cn" class="auth_mail} ; Xiaomei He^b ; Xueyuan Zhang^a ; ^{uwoxyzhang@gmail.com" class="auth_mail}
• 关键词：Magnesium alloy ; AZ31B ; Composite coating ; EIS ; Corrosion resistance
• 刊名：Surface and Coatings Technology
• 出版年：15 March, 2014
• 年：2014
• 卷：242
• 期：Complete
• 页码：83-91
• 全文大小：2205 K

文摘

A simple and practical anodic polarization method was employed to increase the reaction activity of AZ31B magnesium alloy with a cathode electrophoresis coating solution. A thick and compact composite coating on Mg alloy substrate was formed via anodic polarization for 5 min and electroless electrophoresis coating for 7 min. The results of immersion test and electrochemical measurements in 3.5 wt.% NaCl solution showed that the composite coating exhibited a much better corrosion resistance than that of the bare Mg alloy and the single electroless electrophoresis coating film.