标题：Electrochemical polymerization of dopamine with/without subsequent PLLA coating on Mg-Zn-Y-Nd alloy
作者：Song, Ci; Yang, Yongxin; Zhou, Yifan; Wang, Liguo; Zhu, Shijie; Wang, Jianfeng; Zeng, Rongchang; Zheng, Yufeng; Guan, Shaokang
作者机构：[Song, Ci; Yang, Yongxin; Zhou, Yifan; Wang, Liguo; Zhu, Shijie; Wang, Jianfeng; Guan, Shaokang] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, 更多
通讯作者：Wang, Liguo;Wang, LG;Guan, SK
通讯作者地址：[Wang, LG; Guan, SK]Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Henan, Peoples R China.
关键词：Electrodeposition; Surface; Mg-Zn-Y-Nd alloy; Polydopamine; Galvanostat;; Sodium salicylate
摘要：The high surface roughness of dip polydopamine (dPDA) coating on magnesium alloy could decrease the quality of secondary modification. In the present study, we report an electropolymerized dopamine (ePDA) coating on Mg-Zn-Y-Nd alloy from sodium salicylate aqueous solutions by galvanostat method to address this problem. The coating formation process and coating structure were investigated. Then, a Poly (L-lactic acid) (PLLA) coating was prepared on ePDA and dPDA treated samples. The SEM results reveal that the ePDA film appeared to be more uniform than dPDA coating and was doped with salicylate and magnesium ions. ASTM D3359-09 "Tape test" shows excellent adhesion of the ePDA/PLLA layer. The electrochemical impedance spectroscopy and polarization curves demonstrate ePDA/PLLA film has a better corrosion resistance than dPDA/PLLA film, owing to the structural difference of polydopamine anchoring layer. (C) 2019 Published by Elsevier B.V.