红壤土浸出液中SO42-对铜包钢耐蚀性能的影响研究

摘要

The investigation is about the corrosion behavior of copper-clad steel suffered from different concentrations of SO42-using SEM-EDS, polarization curves, and electrochemical impedance spectroscopy technique. The results shows that the materials of copper-clad steel immersed in the red soil solutions containing different concentrations of SO42-in 20 days were destroyed from pitting corrosion. With the increase of SO42-concentration from 0. 05 to 0. 2 mol/L, the corrosion degree showeda tendency of increasing gradually at low concentration and decreasing at high concentration of SO42-. The copper-clad steel corrosion was the severest. When immersed in the red soil solution of with SO2-4concentration of 0. 05 mol/L for 20 days. The destruction was into inner steel. As the copper-clad steel immersed in the red soil solution of with SO2-4concentration of 0. 05 mol/L for 20 days was covered by more insulated corrosion products than others, its impedance of copper-clad steel was the most eminent, and its corrosion rate was also the lowest.%本文采用扫描电镜/能谱分析 (SEM-EDS)、动电位极化、电化学阻抗谱技术研究了铜包钢接地材料受SO42-浓度影响的腐蚀行为.研究结果表明在含有不同浓度的SO42-的红壤土浸出液浸泡20 d, 铜包钢都已出现点蚀现象.随着SO42-浓度从0. 05～0. 2 mol/L逐渐增加, 铜包钢腐蚀程度呈现先增后减弱的趋势, 在0. 05 mol/L的SO42-浸出液中浸泡20天腐蚀最为严重, 已腐蚀至内层钢.由于0. 05 mol/L的SO42-浸出液中腐蚀后的铜包钢表面已被较多的不导电的腐蚀产物覆盖, 因此实验结果显示其阻抗值最大和腐蚀速率最慢.