Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第13卷    第3期    总第54期    2003年6月

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文章编号:1004-0609(2003)03-0631-04
铝在含SO2湿润/干燥环境中的腐蚀规律
韩 薇, 王振尧, 于国才, 汪 俊 

(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。 

 

关键词: 铝;大气腐蚀; SO2

Corrosion of aluminum in wet/dry environment containing SO2
HAN Wei, WANG Zhen-yao, YU Guo-cai, WANG Jun

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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