通过环保型阳极氧化工艺在MB2镁合金表面获得了表面质量良好的银灰色氧化膜层,用金相显微硬度计、扫描电镜和X射线衍射等表面分析手段,研究了氧化膜层的显微硬度、截面形貌和相结构,并采用动电位扫描的电化学方法考察了氧化膜的耐腐蚀性能.结果表明:氧化膜层的主要成分为MgO、MgAl2O4、Al2O3;膜层具有多孔结构,孔径较为均匀,分为内外两层,外层为疏松层,内层为与基体结合牢固的致密层;阳极氧化电流密度和电解液中铝盐浓度是影响阳极氧化膜层性能的主要因素;所得膜层的显微硬度值高达558.4 HV,同时其耐蚀性能也远优于传统含铬DOW17工艺所成的防护膜,且所用电解液无铬无磷更为环保经济.
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