Electrochemical Corrosion Characteristics of Q235 Steel and Copper in Simulated Red Soil Solutions with Different pH Values
摘 要
采用极化曲线和电化学阻抗谱(EIS)技术,对比研究了Q235钢和纯铜在不同pH红壤模拟溶液中的腐蚀电化学特征。结果表明:Q235钢和纯铜的腐蚀速率均随着溶液pH的升高而降低。在红壤模拟溶液中,Q235钢的阳极主要发生Fe的活性溶解,腐蚀过程受阴极还原反应控制;纯铜阴极主要发生氧的去极化反应,腐蚀过程受阳极溶解反应控制,且溶液中的H+含量会影响腐蚀产物膜的形成过程。在pH为4和5的模拟溶液中,纯铜的耐蚀性较碳钢的提高不大;在pH为6的模拟溶液中,致密腐蚀产物膜的形成使纯铜的腐蚀速率显著降低。
Abstract
Corrosion and electrochemical characteristics of Q235 steel and copper in red soil simulated solutions with different pH were compared and studied by polarization curve and electrochemical impedance spectroscopy (EIS) techniques. The results show that the corrosion rate of Q235 steel and copper decreased with increasing pH of solution. In red soil simulation solution, the active dissolution of Fe mainly occurred in the anode of Q235 steel, and the corrosion process was controlled by cathodic reduction reaction. The cathode of copper mainly underwent a depolarization reaction of oxygen, and the corrosion process was controlled by anodic dissolution reaction, and the content of H+ in the solution would affect the formation process of corrosion product film. In the simulated soil solutions with pH 4 and 5, the corrosion resistance of copper was not much higher than that of carbon steel, and in the simulated solution with pH 6, the formation of dense corrosion product film on the sample surface significantly reduced the corrosion rate of copper.
中图分类号 TG174 DOI 10.11973/fsyfh-202003004
所属栏目 试验研究
基金项目 国家自然科学基金(51961028);国家电网公司科技项目(52182017000Y)
收稿日期 2018/6/14
修改稿日期
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联系人作者刘光明(gemliu@126.com)
引用该论文: LIU Xin,PEI Feng,ZHU Yichen,ZHANG Shiyu,LIU Guangming,LIU Zhilei. Electrochemical Corrosion Characteristics of Q235 Steel and Copper in Simulated Red Soil Solutions with Different pH Values[J]. Corrosion & Protection, 2020, 41(3): 22
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【5】聂向晖,李晓刚,李云龙,等. 碳钢的土壤腐蚀模拟加速实验[J]. 材料工程,2012,40(1):59-65.
【6】郭淑琴. Q235钢和镀锌钢在赣州地区酸性红壤环境下腐蚀行为的研究[D]. 南昌:南昌航空大学,2015.
【7】付晶,朱志平,裴锋,等. 砂质土壤中的Cl-含量对接地网材20钢腐蚀行为的影响[J]. 材料保护,2013,46(9):57-60.
【8】马光,韩钰,聂京凯,等. 电气工程接地用铜覆钢腐蚀性能研究[J]. 华东电力,2010,38(11):1736-1739.
【9】SRIVASTAVA A,BALASUBRAMANIAM R. Microstructural characterization of copper corrosion in aqueous and soil environments[J]. Materials Characterization,2005,55(2):127-135.
【10】伍远辉,刘天模,孙成,等. 酸雨作用下酸性土壤酸化过程中铜的腐蚀行为[J]. 四川大学学报(工程科学版),2010,42(1):119-125.
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【14】裴锋,刘欣,贾蕗路,等. 溶液酸碱度对锌包钢腐蚀行为的影响[J]. 热加工工艺,2017,46(12):71-74.
【15】王森,胡亚博,李志忠,等. 三种典型接地极材料在陕北土壤模拟溶液中的腐蚀行为[J]. 腐蚀与防护,2013,34(6):485-488.
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