采用大气暴露试验、扫描电镜、能谱及失重法对AZ31，AZ61和AZ80三种镁合金在万宁标准试验场的大气腐蚀行为进行了研究。结果表明，镁合金耐大气腐蚀的性能随铝含量的增加而提高，且发生的腐蚀以点蚀为主，局部形成爪形腐蚀坑。在这三种材料中,AZ31镁合金表面出现的爪形腐蚀坑最多，腐蚀坑面积最大。三种镁合金经2个月环境试验后背光面的腐蚀程度较正面的严重，形成的腐蚀产物主要以碳酸盐为主，并含有少量的氯化物。

The atmospheric corrosion behaviors of AZ31,AZ61 and AZ80 magnesium alloys were investigated by exposure test in Wanning standard test site. After two months exposure test, the corrosion morphologies and the components of the corrosion products were observed and analyzed by scanning electron microscopy(SEM) equipped with energy-dispersive X-ray spectrometer (EDS). The corrosion rates of magnesium alloys were calculated by mass-loss method. The results indicated that the atmospheric corrosion resistance of magnesium alloys in Wanning standard test site was improved with the content of aluminum added. The main corrosion behavior was pitting corrosion，and some claw holes appeared on part of the surface. Among the three magnesium alloys, the amount of claw holes on AZ31 was the most, and the area of each claw hole on AZ31 was the largest. There were more corrosion products on the back surfaces than on the front. The main constitute of the corrosion products was carbonate with few chloride.