采用自制三价铬钝化液对镀锌的马口铁片进行钝化及硅烷封闭处理.钝化液组成为:Cr2(SO4)3 270 g/L,C6H8O7·H2O10 g/L,CoSO4·7H2O 100 g/L,NH4HF2 77 g/L,NaH2PO2·H2O48.8 g/L,NaNO3 32 g/L,D-葡萄糖酸钠15 g/L.讨论了钝化时间、温度、pH等工艺条件对钝化膜耐蚀性的影响,并研究了乙烯基三甲基硅烷封闭处理对钝化膜表面形貌和耐蚀性的影响.结果表明,在pH=1.8下对镀锌层室温钝化60 s所得钝化膜的耐蚀性最好,其在3.5% NaCl溶液中浸泡240 h仍未出现白锈.采用乙烯基三甲基硅烷封闭处理后,钝化膜表面生成均匀的胶态膜,在中性盐雾试验中出现白锈的时间由未封闭时的95 h延长至115h,远远高于72 h的行业要求.
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