铜接地对临近埋地钢质管道阴极保护的影响规律  

Effect of Copper Grounding on Cathodic Protection of Nearby Buried Steel Pipelines

作　　者：吴昉赟 赵永明 文杰 李志龙 金雪娜 林铭涵 刘德军 李邱达 胡明磊 葛炼伟 刘洪群[3] WU Fangyun;ZHAO Yongming;WEN Jie;LI Zhilong;JIN Xuena;LIN Minghan;LIU Dejun;LI Qiuda;HU Minglei;GE Lianwei;LIU Hongqun(CNNC Nuclear Power Operations Management Co.,Ltd.,Jiaxing 314000,China;CNNP Operation Maintenance technology Co.,Ltd.,Hangzhou 310000,China;Suzhou Nuclear Power Research Institute,Suzhou 215004,China)

机构地区：[1]中核核电运行管理有限公司,嘉兴314000 [2]中核运维技术有限公司,杭州310000 [3]苏州热工研究院有限公司,苏州215004

出　　处：《腐蚀与防护》2025年第1期111-119,共9页Corrosion & Protection

基　　金：秦山核电阴极保护系统智能化研究(Y2023-0241)。

摘　　要：为探寻铜接地(极)对埋地管道阴极保护电位及电流分布的影响,采用恒电位极化方法测试了铜接地及管材的阴极极化行为,将测试结果结合数值模拟计算了3种因素(极化电流密度、管径及接地长度)作用下埋地管道的电位及电流密度分布并分析了其影响规律,运用等效电路法对管道受铜接地影响规律进行理论分析。结果表明,当接地阴极极化电流密度增加,接地长度增加或接地邻近管道时,接地吸收的阴极保护电流增加,埋地管道所受阴极保护电流流失量增加,铜接地吸收了临近埋地钢质管道的阴极保护电流造成管道电位的正向偏移,接地电流在管道沿线形成的地电位是造成管道电位分布不均匀的主要原因之一。将大地、接地、管道及阳极构成一个等效回路,根据等效电路模型进行公式推导,计算得到的接地电流及其对管道电位分布的影响与模拟结果接近,该公式可用于预测接地对临近埋地钢质管道阴极保护的影响规律。To investigate the influence of copper grounding electrode on the cathodic protection potential and current distribution of buried pipelines,the constant potential polarization method was used to test the cathodic polarization behavior of copper grounding and pipe materials.The test results were combined with numerical simulation calculations to analyze the distribution of potential and current density in buried pipelines under the effects of three factors(polarization current density of copper grounding,pipe diameter,and grounding length)and their impact patterns.The equivalent circuit method was applied to theoretically analyze the influence pattern of pipelines affected by copper grounding.The results show that when the cathodic polarization current density for grounding increased,the grounding length increased,or when it was near other pipelines,the cathodic protection current absorbed by the grounding increased,leading to an increased loss of cathodic protection current for the buried pipelines.Copper grounding absorbed the cathodic protection current from adjacent buried steel pipelines,causing a positive shift in pipeline potential.The ground potential formed along the pipeline by the grounding current was one of the main reasons for the uneven distribution of pipeline potential.By forming an equivalent loop with the earth,grounding,pipeline,and anode,formulas derived from the equivalent circuit model were used to calculate the grounding current and its impact on pipeline potential distribution,which closely matched the simulation results.This could be used to predict the impact pattern of grounding on the cathodic protection of nearby buried steel pipelines.

关 键 词：阴极保护 极化行为 数值模拟 影响规律 

分 类 号：TG174.4[金属学及工艺—金属表面处理]