分别采用扫描电子显微镜(SEM)和能谱(EDS)分析了AZ91D压铸镁合金酸洗、氟氢化钠溶液浸渍及无铬化学转化处理后的表面形貌及元素组成,并测量了各种前处理后所得转化膜在w=5%NaCl溶液中的极化曲线.结果表明:酸洗工序是镁合金在氟氢化钠溶液中浸渍后表面生成氟化物的必要工序;采用硫酸酸洗后不能得到完整的转化膜,磷酸酸洗后能得到由O、Mn、P、Ca和Mg组成的均匀转化膜;磷酸酸洗及氟氢化钠溶液浸渍后所得转化膜的耐腐蚀性能最佳.
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