在暖通空调管道表面Zn-3Al镀锌层中添加Er元素，通过显微形貌观察、显微硬度测试、全浸腐蚀和盐雾腐蚀试验考察了Er含量对镀锌层的显微组织、显微硬度和耐蚀性的影响。结果表明：当镀锌层中Er添加量为0.06%（质量分数）时，镀锌层中不会出现麻点等缺陷，且晶粒尺寸最为细小，镀锌层表面质量较高；添加Er镀锌层的显微硬度都高于未添加Er的，且随着Er含量的增加，镀锌层显微硬度呈现先升高而后降低的趋势，当Er添加量为0.06%时，显微硬度达到最大；添加Er后，镀锌层的耐全浸腐蚀和盐雾腐蚀性能都优于未添加Er的，当Er添加量为0.06%时，暖通空调管道表面镀锌层具有最佳的耐蚀性。

Er element was added into the Zn-3Al zinc coating on the surface of heat ventilation air conditioner (HVAC) pipes. The effects of Er content on the microstructure, micro-hardness and corrosion resistance of the zinc coating were investigated by microstructure observation, full immersion corrosion test and salt spray corrosion test. The results show that when the amount of Er added into zinc coating was 0.06% (mass), there were no defects such as pitting in the zinc coating, and the grain size was the smallest, showing high quality of the zinc coating. The micro-hardness of the zinc coating with Er was higher in comparison with that without Er, and with the increase of Er content, the micro-hardness of the zinc coating increased first and then decreased, the maximum micro-hardness was obtained when the amount of added Er was 0.06%. The zinc coating with Er had better corrosion resistance to full immersion corrosion and salt spray corrosion compared to the zinc coating without Er. When the amount of added Er was 0.06%, the zinc coating on the HVAC pipe had the best corrosion resistance.