(中国科学院 金属研究所 金属腐蚀与防护国家重点实验室，
沈阳 110016)
摘 要: 利用气体腐蚀试验箱、红外光谱和扫描电镜研究了铝在含SO2的湿润气氛—不含SO2的干燥气氛循环的加速试验条件下的腐蚀规律。并进行了未加SO2而其它试验条件相同的对比试验。试验共分别进行5个周期（120h）。 随着时间延长， SO2的腐蚀性作用明显加强，铝的腐蚀表现出正指数变化规律， 即铝的腐蚀速率随时间延长不断增加。 结果还显示出铝在含SO2的潮湿环境中很难形成保护性好的Al2O3膜， 铝在此试验环境中的腐蚀产物为Al2(SO4)3·18H2O。 在未加SO2的对比试验环境中铝的腐蚀轻微， 5个周期累计质量增加仅为0.043g/m2， 腐蚀质量损失明显小于加SO2时的腐蚀质量损失; 试样表面仍很光亮。
关键字: 铝；大气腐蚀； SO2
（The State Key Laboratory of Corrosion and Protection of Metals,
Institute of Metal Research, the Chinese Academy of Sciences,
Shenyang 110016, China）
Abstract:The corrosion of aluminum in wet/dry enviroment containing SO2 was studied by using IR and SEM. The compared test without SO2 was also carried out. The test went on for 5 cycles (120h).The corrosive effect of SO2 became strong during the test.The corrosion of aluminum followed a function of positive exponent. It shows that the corrosion rate of aluminum increases with time. The results also indicate that, a protect film of Al2O3 can not form on aluminum in wet environment containing SO2. The main corrosion product in the test environment is Al2(SO4)3·18H2O. The aluminum was corroded lightly in the compared test environment, and the mass increase was only 0.043g/m2. The corrosion mass loss was smaller obviously than that in accelerate corrosive environment containing SO2. The surface of specimens was still shiny compared with that with SO2.
Key words: aluminum; atmospheric corrosion; SO2
