铜覆钢在酸性土壤中的交流电腐蚀行为研究  

Alternating current corrosion behavior of copper-clad steel in acidic soil

作　　者：田旭 裴锋 刘欣 曾祥 贾蕗路 TIAN Xu;PEI Feng;LIU Xin;ZENG Xiang;JIA Lulu(State Grid Jiangxi Electric Power Research Institute,Nanchang 330096,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

出　　处：《电镀与涂饰》2025年第3期1-9,共9页Electroplating & Finishing

基　　金：国家电网有限公司总部管理科技项目——多因素耦合下接地材料土壤腐蚀等级分布图绘制及应用研究(5500-202358119A-1-1-ZN)。

摘　　要：[目的]铜覆钢作为接地金属常年深埋于土壤中,同时叠加交流干扰电流的影响,其腐蚀行为比较复杂,值得深入研究。[方法]在实验室模拟酸性土壤环境,施加不同电流密度和时间的交流干扰电流,研究不同条件下土壤的性质,以及铜覆钢的耐蚀性和接地电阻的变化。[结果]土壤在铜的交流电腐蚀过程中发生酸化,其电阻率随交流电流密度的增大呈现先降低后略微上升的趋势。铜层表面的Cu_(2)O腐蚀产物膜随电流密度增大而逐渐变得完整,导致其导电性能下降。当电流密度增大到使局部区域开始形成二价铜腐蚀产物时,膜层的完整性和致密性下降,其导电性能不再有显著的变化。铜覆钢经过交流电腐蚀后,其耐蚀性总体呈下降趋势,尤其是当电流密度较小,膜层覆盖不完整时最为明显。[结论]总体而言,交流电土壤腐蚀会降低铜覆钢的耐蚀性和增大接地电阻,并促进土壤的酸化。[Objective]Copper-clad steel,as a grounding material buried in soil for long periods,is subjected to the interference of alternating current(AC),resulting in complex corrosion behavior that warrants further investigation.[Method]A laboratory simulation of acidic soil conditions was conducted,where AC interference of different densities and durations were applied.The properties of the soil under various conditions,as well as the corrosion resistance and grounding resistance variations of copper-clad steel were examined.[Result]During the AC corrosion of copper,the soil underwent acidification,and its resistivity was decreased initially and then gradually increased with the increasing of AC current density.The Cu_(2)O corrosion product film on the copper surface gradually became more complete as the current density increased,leading to a decrease in its electrical conductivity.However,when the current density was increased to the point where localized regions begin to form divalent copper corrosion products,the integrity and compactness of the corrosion product film were decreased,and its conductivity no longer showed significant changes.Overall,the corrosion resistance of copper-clad steel was decreased after AC corrosion,particularly when the current density was low and the coverage of corrosion product film was incomplete.[Conclusion]In summary,AC soil corrosion reduces the corrosion resistance of copper-clad steel,increases the grounding resistance,and accelerates the soil acidification.

关 键 词：接地金属 铜覆钢 酸性土壤 交流电 腐蚀 

分 类 号：TG172.4[金属学及工艺—金属表面处理]