表面沉积有SO2污染物的黄铜在大气中的腐蚀行为  

Corrosion Behavior of Brass with SO_2 Pollutants Deposited on Surface in Atmosphere

作　　者：蒋以奎 葛红花[1] 薛慧[1] 袁群[1] 孟新静[1] 赵玉增[1] 廖强强[1] 

机构地区：[1]上海电力学院上海热交换系统节能工程技术研究中心,上海市电力材料防护与新材料重点实验室,上海200090

出　　处：《腐蚀与防护》2017年第1期1-5,61,共6页Corrosion & Protection

基　　金：国家自然科学基金项目(51471104);上海市科委项目(14DZ2261000,11DZ2210500);上海市教委科创重点项目(12ZZ173)

摘　　要：采用电化学阻抗谱(EIS)、扫描Kelvin探针(SKP)等方法研究了沉积有SO_2污染物的黄铜电极在大气中的腐蚀行为,采用X射线衍射(XRD)分析了黄铜表面的腐蚀产物。结果表明:表面沉积有SO_2污染物的黄铜电极的腐蚀反应阻力明显小于表面无污染物的黄铜电极的,且表面沉积SO_2污染物的量越大,腐蚀反应阻力越小;随着腐蚀时间的延长,黄铜电极表面腐蚀产物增加,表面伏打电位升高,表面反应活性降低;表面沉积有SO_2的黄铜在大气环境中的腐蚀产物主要为ZnSO_4·7H_2O、CuSO_4·3H_2O及ZnO,另外还有少量的Zn(OH)_2、Cu(OH)_2和CuO。The corrosion behavior of brass with SO2 pollutants deposited on surface in atmospheric environment was investigated by electrochemical impedance spectroscopy （EIS） and scanning Kelvin probe （SKP） techniques. The corrosion products were characterized by XRD. The results showed that the corrosion resistance of brass with SO2 pollutants deposited on surface was much smaller than that without surface deposition of SO2 pollutants. The more the surface deposition of pollutants SO2, the smaller the corrosion resistance. With the extension of corrosion time, more and more corrosion products were produced on the surface of brass. The surface Volta potential shifted positively and the activity of corrosion reaction reduced. The main components of corrosion products of brass were ZnSO4 . 7H2O, CuSO4 . 3H2O, ZnO, and a small amount of Zn（OH）2, Cu（OH）2 and CuO.

关 键 词：电化学阻抗谱 扫描Kelvin探针(SKP) 黄铜 大气腐蚀 SO2 

分 类 号：TG172[金属学及工艺—金属表面处理]