采用光学显微镜（OM）、扫描电子显微镜（SEM）、X射线衍射（XRD）、极化曲线测试、扫描开尔文探针力显微镜（SKPFM）等方法，研究了0.6%（质量分数，下同）Ce与0.3%Ca、0.8%Ca复合添加对Mg-9Al-Zn合金微观组织与耐蚀性的影响。结果表明：Mg-9Al-Zn合金中加入0.6%Ce后，合金组织由连续网状变为断续、弥散分布，Ce与Al结合生成Al₂Ce相，降低了阴极相β-Mg₁₇Al₁₂的体积分数，腐蚀速率明显降低，合金的耐蚀性显著提高；在Mg-9Al-Zn-0.6Ce合金的基础上加入0.3%Ca，Ca固溶于β-Mg₁₇Al₁₂相中，降低了β-Mg₁₇Al₁₂相与α-Mg相之间的电位差，其腐蚀速率相比于Mg-9Al-Zn合金的降低了54.14%，腐蚀电流密度显著降低，耐蚀性得到进一步提高，但当Ca的添加量为0.8%时，生成了Al₄Ca相，阴极相数量明显增多，耐蚀性相比于加入0.3%Ca时的有所降低。

The effects of the combined addition of minor Ce and Ca on the microstructure and corrosion resistance of Mg-9Al-Zn alloy were studied by OM, SEM, XRD, scanning Kelvin probe force microscopy (SKPFM) and polarization curve test. The results showed that after adding 0.6%Ce to Mg-9Al-Zn alloy, the morphology of precipitate phases changed from continuous network to discontinuous and dispersive one. Ce reacted with Al to form Al₂Ce phase, which caused the reduction in content of cathodic phase β-Mg₁₇Al₁₂, and the corrosion resistance of the alloy was improved obviously. After further adding 0.3%Ca to Mg-9Al-Zn-0.6Ce, Ca was dissolved in the β-Mg17Al12 phase, reducing the potential difference between the β-Mg₁₇Al₁₂ phase and α-Mg phase. The corrosion rate of Mg-9Al-Zn-0.6Ce-0.3Ca alloy was reduced by 54.14% compared with Mg-9Al-Zn alloy, and the corrosion current density was also significantly reduced, hence the corrosion resistance was further improved. However, when the Ca addition raised to 0.8%, Al₄Ca phase was formed, and the amount of the cathodic phases significantly increased, leading to the reduction of corrosion resistance compared with the Mg-9Al-Zn-0.6Ce-0.3Ca alloy.