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采用正交实验方法得出了最佳成膜工艺T3/T7,利用线性极化、极化曲线测试、中性盐雾实验等对该工艺形成的膜层耐蚀性进行了研究,并对表面膜层的性能进行了一系列测试.结果表明:在NaCl水溶液中的全面腐蚀速度可降低10~20倍,可通过504h的中性盐雾试验;经该工艺处理后铝合金腐蚀的阴阳极过程都受到明显阻滞,且自然腐蚀电位负移,点蚀电位相对于自然腐蚀电位明显正移,T3/T7处理明显的改善了铝合金在氯化物介质中的耐点蚀性能
The optimum film forming process T3 / T7 was obtained by orthogonal experiment. The corrosion resistance of the film formed by this process was studied by linear polarization test, polarization curve test and neutral salt spray test, Film performance A series of tests were conducted. The results show that the total corrosion rate in NaCl aqueous solution can be reduced by 10 ~ 20 times and can pass the neutral salt spray test for 504 hours. After the process, the anodic and cathodic processes of aluminum alloy corrosion are obviously retarded, and the natural corrosion potential Negative displacement and pitting potential were significantly positive relative to natural corrosion potential. T3 / T7 treatment significantly improved the pitting corrosion resistance of aluminum alloy in chloride media