AZ91镁合金表面合成聚苯胺涂层及其腐蚀性能研究.pdf

第34 卷 第6 期 中国腐蚀与防护学报 Vol.34 No.6 2014 年12 月 Journal of Chinese Society for Corrosion and Protection Dec. 2014 AZ91 镁合金表面合成聚苯胺涂层及其 腐蚀性能研究 1,2 1 潘太军 汪涛 1. 常州大学 材料科学与工程学院常州 213164; 2. 常州大学 江苏省材料表面技术重点实验室常州 213164 摘要：采用循环伏安法(CV) 在含草酸、苯胺单体的溶液中以AZ91 镁合金为基底沉积聚苯胺(Pani) 涂层，并通 过IR 和SEM 等手段对涂层的结构和形貌特征进行表征；同时通过极化曲线、开路电位-时间曲线及电化学阻 抗谱(EIS) 等评价涂层在3.5%NaCl 溶液中的耐蚀性。结果表明，聚苯胺涂层有效提高了镁合金基体的自腐蚀 电位，并导致镁合金腐蚀电流密度下降近两个数量级；长期浸泡过程中发现涂层能够有效抑制腐蚀溶液的渗 透，阻止基体合金的腐蚀。 关键字：聚苯胺 循环伏安法 腐蚀 AZ91 镁合金 中图分类号：O646, TG174.4 文献标识码：A 文章编号：1005-4537(2014)06-0489-06 Corrosion Performance and Preparation of Polyaniline Film on the Surface of AZ91 Magnesium Alloy PAN Taijun1,2, WANG Tao1 1. School of Material Science and Engineering, Changzhou University, Changzhou 213164, China; 2. Jiangsu Key Laboratory of Material Surface Technology, Changzhou University, Changzhou 213164, China Abstract: Polyaniline (Pani) film was applied onto AZ91 magnesium alloy in aqueous solutions containing oxalic acid and aniline monomer by cyclic voltammetry (CV) technique, which then was characterized by means of IR and SEM technique. Furthermore, the corrosion performance of the coating was evaluated in 3.5%NaCl solution through examining the polarization curves, open circuit potential versus time and the electrochemical impedance spectroscopy (EIS). The results in- dicated that the Pani coating could effectively shift the free corrosion potential much positively for the coated AZ91 magnesium and led to sig