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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。
Cyclic voltammetry (CV) was used to deposit polyaniline (PAIi) coating on AZ91 magnesium alloy in solution containing oxalic acid and aniline monomer. The structure and morphology of the coating were characterized by IR and SEM The corrosion resistance of the coating in 3.5% NaCl solution was also evaluated by polarization curve, open circuit potential-time curve and electrochemical impedance spectroscopy (EIS). The results show that the polyaniline coating can effectively increase the corrosion potential of the magnesium alloy substrate and lead to the decrease of the corrosion current density of the magnesium alloy by nearly two orders of magnitude. During long-term immersion, the coating can effectively inhibit the penetration of the etching solution and prevent the corrosion of the matrix alloy corrosion.