表面沉积氯化钠的7A04铝合金在模拟环境中的腐蚀行为  

Corrosion behavior of 7A04 aluminum alloy deposited with sodium chloride in simulated environment

作　　者：周和荣[1,2] 马坚 李晓刚[2] 陆启凯 冯皓 揭敢新 

机构地区：[1]中国电器科学研究院工业产品环境适应性国家重点实验室,广州510663 [2]北京科技大学腐蚀与防护中心,北京100083

出　　处：《中国有色金属学报》2009年第5期974-980,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50499331);科技部科技基础条件平台建设资助项目(2005DTA10400)

摘　　要：在实验室模拟条件下((25±2)℃,相对湿度(95±5)%),采用增重法、扫描电子显微镜、傅立叶红外光谱和X射线衍射等方法研究氯化钠和几种模拟环境气氛对7A04铝合金大气腐蚀行为的影响,并对其腐蚀机理进行讨论。结果表明:表面沉积氯化钠的7A04铝合金在几种模拟气氛环境中均明显地加速了材料的腐蚀;随腐蚀时间的延长,腐蚀产物不断增多;腐蚀产物微观形貌呈团块状且凹凸不平;腐蚀增重△m/A与暴露时间t之间符合指数衰减规律;气氛腐蚀性由强到弱的顺序为50×10-6SO2>1%CO2>空气。The corrosion behavior of 7A04 aluminum alloy deposited with NaC1 in several simulated environments （（25±2） ℃ and relative humidity （RH） （95±5）%） was investigated by mass gain method, Fourier transform infrared spectroscope, scanning electron microscopy and X-ray diffractometry. The corrosion mechanism for aluminum alloy was discussed. The results show that NaCl can evidently accelerate the atmospheric corrosion of 7A04 aluminum alloy in several simulated environments. The corrosion products increase with prolonging corrosion time. The surface observation reveals that the corrosion products are agglomerate and accidented. The relationship between mass gain of corrosion product and time accords with the exponential attenuation rule. The corrosion sequence of corrosion mediums from strong to ebb is 50 × 10^-6 SO2〉1%CO2〉air.

关 键 词：7A04铝合金 大气腐蚀 模拟环境 

分 类 号：TG172.3[金属学及工艺—金属表面处理]