红壤中直流杂散电流对铜腐蚀行为的影响  

Effect of DC stray current on corrosion behavior of copper in red soil

作　　者：刘欣 李冠华 裴锋 徐碧川 田旭 贾蕗路 LIU Xin;LI Guanhua;PEI Feng;XU Bichuan;TIAN Xu;JIA Lulu(State Grid Jiangxi Electric Power Company Limited Electric Power Research Institute,Nanchang 330096,China;State Grid Liaoning Electric Power Company Limited Electric Power Research Institute,Shenyang 110006,China)

机构地区：[1]国网江西省电力有限公司电力科学研究院,江西南昌330096 [2]国网辽宁省电力有限公司电力科学研究院,辽宁沈阳110006

出　　处：《电镀与涂饰》2025年第3期10-15,共6页Electroplating & Finishing

基　　金：国家电网有限公司总部管理科技项目——多源复杂路径杂散电流特征参量及危害评价与治理关键技术研究(5500-202325165A-1-1-ZN)。

摘　　要：[目的]研究直流杂散电流对红壤环境中纯铜腐蚀行为的影响,为电力系统接地网材料的腐蚀防护提供参考。[方法]通过实验室模拟红壤环境,在0.1~0.4 mA/cm^(2)的直流电流密度下进行24 h恒流腐蚀试验。采用电化学工作站监测纯铜的电位动态变化,结合失重法计算腐蚀速率,并运用金相显微镜、扫描电镜(SEM)和X射线衍射仪(XRD)分析腐蚀形貌及产物组成。[结果]纯铜的腐蚀速率与电流密度呈正相关,实际腐蚀速率与理论值的偏差在2.91%~10.21%之内。电位演变呈现先快速下降后缓慢上升,最后趋于动态平衡的特征,腐蚀产物以疏松多孔的Cu_(2)O为主,表面呈现典型的局部腐蚀形貌。[结论]直流杂散电流显著加剧红壤中纯铜的腐蚀进程,可通过电流密度有效预测腐蚀速率。本文的研究结果为接地网材料的腐蚀评估提供了依据。[Objective]The corrosion behavior of pure copper in red soil under DC stray current interference needs to be studied to provide reference for corrosion protection of grounding grid materials in power systems.[Method]Laboratory simulations were conducted in red soil with DC current densities ranging from 0.1 to 0.4 mA/cm^(2) for 24 hours.The dynamic changes in potential of copper were monitored using an electrochemical workstation,and the corrosion rate was calculated by mass loss method.The corrosion morphology and product composition were analyzed by metallographic microscopy,scanning electron microscopy(SEM),and X-ray diffraction(XRD).[Result]The corrosion rate of copper was positively correlated with current density,and the deviation of the actual corrosion rate from the theoretical value was in the range of 2.91%-10.21%.The potential evolution exhibited a characteristic of rapid decline followed by slow increase,eventually reaching a dynamic equilibrium.The corrosion products were primarily loose and porous Cu_(2)O,and the surface displayed typical localized corrosion morphology.[Conclusion]DC stray current significantly accelerates the corrosion process of copper in red soil.The corrosion rate can be effectively predicted based on the current density.The findings of this study provide valuable references for the corrosion assessment of grounding grid materials.

关 键 词：铜 接地网材料 红壤 直流杂散电流 腐蚀 微观形貌 相结构 

分 类 号：TG172[金属学及工艺—金属表面处理]