为了进一步探明镁合金Ce－Mn化学转化液添加四硼酸钠后各组分的最佳含量，采用正交试验从膜自腐蚀电流和钝化区间角度优化了以Ce（NO3），为主盐、KMnO4为氧化剂、四硼酸钠为添加剂的镁合金Ce－Mn转化膜的成膜液组分。用极化曲线研究转化膜的耐腐蚀性能，并用扫描电镜（SEM）及能谱仪（EDS）对转化膜的微观形貌和成分进行分析。结果表明：最佳成膜液配方为5～8g/L Ce（NO3）3，1．6—2．0g／LKMnO4，0．2～0．5g/L四硼酸钠；镁合金经该成膜液处理后表面形成均匀的转化膜，自腐蚀电位正移、自腐蚀电流密度降低，对镁合金起到了良好的防护作用。
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