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%Na Cl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。
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% Na Cl solution through examining the polarization curves, open circuit potential versus time and the electrochemical impedance spectroscopy(EIS). The results indicated that the Pani coating could effectively shift the free corrosion potential much positively for the coated AZ91 magnesium and led to significantly diminish its corrosion current density by two orders of magnitude. Long- term immersion experiments indicated that the Pani coating can effectively hinder the permeation of corrosive species toward matrix, thereby prevent AZ91 magnesium alloy from corrosion.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2014年第6期489-494,共6页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金项目(51101023)
常州市科技项目(CE20110005)
江苏省海外研修项目资助
关键词
聚苯胺
循环伏安法
腐蚀
AZ91镁合金
polyaniline,cyclic voltammerty,corrosion,AZ91 magnesium alloy
