采用微弧氧化(MAO)技术在7050铝合金表面制备了陶瓷膜层,运用扫描电子显微镜(SEM)和能谱分析仪(EDS)表征陶瓷膜微观结构,采用动电位极化曲线、电化学阻抗谱(EIS)和慢应变速率拉伸试验(SSRT)研究了微弧氧化膜对7050铝合金在3.5%(质量分数)Na Cl水溶液中腐蚀和应力腐蚀开裂(SCC)行为的影响.结果表明:微弧氧化膜层由表面疏松层与内部致密层组成,表面疏松层主要由Al2O3组成,内部致密层由氧化铝与铝烧结而成.微弧氧化膜层可以有效抑制7050铝合金表面的腐蚀萌生及明显降低腐蚀速率,且使7050铝合金的应力腐蚀敏感性出现显著下降. The ceramic coating was prepared on the surface of 7050 aluminum alloy by micro-arc oxidation (MAO) technology. The microstructure of the ceramic coating was characterized by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) (EIS) and Slow Strain Rate Tensile Test (SSRT) were used to investigate the effect of micro-arc oxidation on the corrosion and SCC behavior of 7050 aluminum alloy in 3.5% NaCl aqueous solution. The results show that: The micro-arc oxidation film is composed of surface loose layer and internal dense layer, the surface loose layer is mainly composed of Al2O3, the inner dense layer is formed by sintering alumina and aluminum.Micro-arc oxidation film can effectively inhibit the corrosion initiation of 7050 aluminum alloy surface And significantly reduce the corrosion rate, and the 7050 aluminum alloy stress corrosion susceptibility decreased significantly.