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利用电化学极化技术和交流阻抗技术对高纯Mg、Mg合金AZ91D及AM6 0B在 5种稀土盐溶液中的成膜情况及被膜金属在 3.5 %NaCl溶液中的腐蚀行为进行了研究 .极化测试结果表明 ,稀土转化处理能使高纯Mg及Mg合金AM 6 0B的耐蚀性能得到一定程度的提高 ,但对AZ91D的耐蚀性能却几乎没有任何改善 .EIS测试结果显示 ,稀土转化膜在 3.5 %NaCl溶液中的耐蚀性能随浸泡时间延长呈先增强后减弱的趋势
Electrochemical polarization and AC impedance techniques were used to investigate the film formation of high purity Mg and Mg alloys AZ91D and AM6 0B in five rare earth salt solutions and the corrosion behavior of the coated metal in 3.5% NaCl solution.Polarization The results show that the corrosion resistance of high purity Mg and Mg alloy AM60B can be improved to a certain degree by rare earth conversion treatment, but the corrosion resistance of AZ91D steel has almost no improvement.EIS test results show that the RE conversion film The corrosion resistance of 3.5% NaCl solution first increased and then decreased with the soaking time