在添加不同含量Na₂CO₃和C₆H₁₂O₆的NaOH-Na₂SiO₃-Na₂B₄O₇基础电解液中，对AZ31镁合金进行直流阳极氧化处理，研究了镁合金阳极氧化膜的微观结构以及在中性盐雾中的耐腐蚀性能。结果表明：镁合金阳极氧化膜主要由MgO相和Mg₂SiO₄相组成；电解液中添加Na₂CO₃和C₆H₁₂O₆后，阳极氧化膜表面微孔分布均匀且尺寸减小，阳极氧化膜厚度增加；当Na₂CO₃质量浓度由10 g·L^-1增加到30 g·L^-1时，微孔尺寸增大，氧化膜厚度减小；当C₆H₁₂O₆质量浓度由5 g·L^-1增加到15 g·L^-1时，微孔尺寸减小，阳极氧化膜厚度增加；镁合金阳极氧化膜的主要腐蚀形式为点蚀，呈河流状花样分布；电解液中添加10 g·L^-1 Na₂CO₃时，阳极氧化膜表面微孔最细小，孔径为1～3 μm，阳极氧化膜厚度达16 μm，阳极氧化膜具有较好的耐腐蚀性能。

After adding different content of Na₂CO₃ and C₆H₁₂O₆ into NaOH-Na₂SiO₃-Na₂B₄O₇ basic electrolyte, AZ31 magnesium alloy was treated by direct current anodizing and then the microstructure and corrosion resistance in neutral salt spray of the magnesium alloy anodized film were studied. The results show that all magnesium alloy anodized film consisted of MgO and Mg₂SiO₄ phase. After adding Na₂CO₃ and C₆H₁₂O₆ into electrolyte, the micropores evenly distributed on the surface of the anodized film, and the size decreased; the thickness of the anodized film increased. When the mass concentration of Na₂CO₃ increased from 10 g·L^-1 to 30 g·L^-1, the size of micropores increased, and the thickness of anodized film decreased. When the mass concentration of C₆H₁₂O₆ increased from 5 g·L^-1 to 15 g·L^-1, the size of micropores decreased, and the thickness of anodized film increased. The main corrosion form of magnesium alloy anodized film was pitting, which presented a distribution of fluvial pattern. After adding 10 g·L^-1 Na₂CO₃ into the electrolyte, the micropores had the smallest size with the diameter of 1-3 μm, and the thickness of the anodized film reached 16 μm; the anodized film had relatively good corrosion resistance.