在AZ91镁合金表面采用化学方法制备转化膜层.对植酸化学转化溶液中植酸质量分数,pH,反应温度,反应时间等进行单因素实验和正交试验,确定最佳工艺参数:3mL/L植酸,3g/LNaF,40 g/L H3 BO3,15 mL/L H2O2,pH为4.5.在镁合金表面获得淡灰致密,具有微细裂纹的膜层.在植酸化学转化溶液中添加5 g/L Ce(NO3)3·6H2O获得更为优异的耐蚀膜层.通过X-射线衍射测试表明,添加Ce(NO3)3·6H2O的镁合金化学转化膜的主要成分为MgH10 O24 P6和CeO2.耐蚀性测试表明,两种溶液获得的镁合金化学转化膜的耐蚀性能均有提高,其中添加硝酸铈的膜层微观形貌及性能较佳.
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