采用金相显微镜和交流阻抗谱研究了涂层缺陷以及不同前处理工艺对建筑铝合金6063在0.04 mol/LNa2 SO4溶液(pH=3.0)中的腐蚀行为.研究结果表明:未经铬酸钝化处理的铝合金缺陷粉末涂层在0.04 mol/L Na2SO4(pH=3.0)溶液中浸泡50 d后,其划痕处堆积满腐蚀产物,划痕两侧局部出现明显翘起和气泡；浸泡相同时间的经铬酸钝化处理的铝合金粉末涂层其腐蚀速率低约1个数量级,铝合金钝化膜能延缓腐蚀,提高缺陷涂层和完整涂层的阻抗.
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