采用钢铁、铝改进型磷化技术对AZ91D镁合金进行磷化，膜薄，不耐蚀。利用扫描电镜（SEM）、X射线衍射（XRD）技术，研究了镁合金预处理后的表面形貌、组构及钡基磷酸盐转化膜的表面形貌及相组成。采用电化学、盐雾和湿热技术测试了磷酸盐转化膜的抗腐蚀性能。结果表明：AZ91D镁合金预处理前后表面的相组成基本不变，酸洗后表面在相界处出现了较深的狭缝；磷酸盐转化膜主要由Mg，MgO和一些无定形的相组成；钡基磷酸盐转化膜可以明显提高AZ91D镁合金的抗腐蚀性能。
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