Abstract The effects of trace Ce on the microstructure, mechanical properties and corrosion resistance of Al-Zn-Mg alloy were studied by means of metallographic, scanning electron microscopy (SEM), mechanical tensile test, slow strain rate tensile test, cyclic polarization curve test, electrochemical impedance spectroscopy test and anodic oxidation test. The results show that the addition of trace Ce has little effect on the strength of Al-Zn-Mg alloy, but can significantly improve the corrosion resistance of the alloy; The mechanical properties and corrosion resistance of the alloys decreased significantly with the addition of excessive Ce; The addition of 0.04 wt% Ce can reduce significantly the self-corrosive current density of Al-Zn-Mg alloy and increase obviously passivation film resistance of the alloy. The stress corrosion sensitivity index decreased from 0.612 to 0.219, which improved the corrosion resistance properties significantly.

中文翻译：

---

铈对Al-Zn-Mg合金显微组织、力学性能和腐蚀性能的影响

摘要 采用金相、扫描电镜(SEM)、机械拉伸试验、慢应变速率拉伸试验、循环极化曲线试验等手段研究微量Ce对Al-Zn-Mg合金组织、力学性能和耐蚀性的影响。 、电化学阻抗谱测试和阳极氧化测试。结果表明，微量Ce的加入对Al-Zn-Mg合金的强度影响不大，但能显着提高合金的耐蚀性；加入过量的Ce，合金的力学性能和耐腐蚀性能显着下降；添加0.04wt%的Ce可以显着降低Al-Zn-Mg合金的自腐蚀电流密度，显着提高合金的钝化膜电阻。