利用正交试验法进行试验 ,通过计算分析 ,得到了压铸镁合金AZ91D环保型阳极氧化电解液最佳配方。同时发现 ,当电解液浓度发生变化时 ,即使电解液组分及其它成膜条件相同 ,所得膜层厚度与其耐蚀性之间也不存在直接的相关性。这可能是阳极氧化膜的防护性能受包括膜层厚度、孔隙率、元素组成及相组成等在内的多种因素的影响 ,而这些因素又与电解液浓度密切相关的结果 Using orthogonal test method for the test, through calculation and analysis, obtained the best formula die-casting magnesium alloy AZ91D environmentally friendly anodizing electrolyte. It is also found that there is no direct correlation between the resulting film thickness and its corrosion resistance even when the electrolyte concentration is changed, even if the electrolyte composition and other film forming conditions are the same. This may be the protective performance of the anodized film by a variety of factors including film thickness, porosity, elemental composition and phase composition, and these factors are closely related to the electrolyte concentration results