表面沉积有SO2污染物的黄铜在大气中的腐蚀行为

摘要

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.%采用电化学阻抗谱(EIS)、扫描Kelvin探针(SKP)等方法研究了沉积有SO2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SO2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SO2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SO2的黄铜在大气环境中的腐蚀产物主要为ZnSO4·7H2O、CuSO4·3H2O及ZnO,另外还有少量的Zn(OH)2、Cu(OH)2和CuO.