高强铝合金在不同SO_2模拟环境中的腐蚀行为及相关性研究  

CORROSION BEHAVIORS AND RELATIVITY OF HIGH STRENGTH ALUMINUM ALLOY IN DIFFERENT SIMULATED SO_2 ENVIRONMENT

作　　者：周和荣 马坚 李晓刚[2] 揭敢新 冯皓 王俊 赵钺 

机构地区：[1]中国电器科学研究院,广州510300 [2]北京科技大学腐蚀与防护中心,北京100083

出　　处：《中国腐蚀与防护学报》2011年第6期446-452,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(50971048);科技部科技基础条件平台建设项目(2005DTA10400)资助

摘　　要：采用扫描电镜(SEM/EDX)、失重法等研究了7A04铝合金在两种模拟SO2气氛条件下的腐蚀行为和规律,以及与江津大气暴晒试验结果的相关性。结果表明,随试验时间的延长,铝合金腐蚀产物不断增多,腐蚀失重与时间的关系符合指数规律C=A·t^n;表面腐蚀产物形貌呈团状或圆团状,并不断向外扩展延伸,呈现不均匀的凹凸形貌;腐蚀产物为氢氧化铝和硫酸铝水合物;从腐蚀动力学角度分析,7A04铝合金在0.067%SO_2气氛环境中间隙腐蚀的试验结果与江津户外暴露试验的相关度最高。The corrosion behaviors of high strength aluminum alloy 7A04 in three different experimental conditions have been investigated by scanning electron microscope （SEM）, energy dispersive X-ray detection （EDX）, Fourier transform infrared（FTIR） and mass loss method, and the relativity has been analyged with the result of Jiangjin atmospheric environment. The results show that the corrosion product increases with testing hours prolonging, and the mass loss of corrosion product obeys the exponential rule as C = A ~ tn. Surface observation shows that corrosion product is agglomerated and extended forth. The corrosion products are made up of alumina, aluminum sulfate hydrate and aluminum chloride. The simulation results for the aluminum alloy 7A04 at cyclic wet-heat conditions （40 ℃,8 h; 25℃, 16 h; 95% RH） in the 0.067% SO2 polluted environment had better correlation with Jiangjin exposure result according to the mass loss data in all simulation methods in the paper.

关 键 词：铝合金 SO2污染 增重法 相关性 

分 类 号：TG172.3[金属学及工艺—金属表面处理]