交流干扰下埋地管道外加电流阴极保护应用分析  

Analysis on Application of Impressed Current Cathodic Protection for Buried Pipelines under AC Interference

作　　者：郭勇 丁继峰[1,2] 高志贤 尹安[1] 张波 杨朝晖[1] 李向阳 GUO Yong;DING Ji-feng;GAO Zhi-xian;YIN An;ZHANG Bo;YANG Zhao-hui;LI Xiang-yang(Qingdao NCS Testing and Protection Technology Co.,Ltd.,Qingdao 266071,China;Central Iron and Steel Research Institute,Beijing 100081,China;Beijing Advanced Innovation Center for Materials Genome Engineering,China Iron&Steel Research Institute Group,Beijing 100081,China)

机构地区：[1]青岛钢研纳克检测防护技术有限公司,山东青岛266071 [2]钢铁研究总院,北京100081 [3]中国钢研科技集团有限公司北京材料基因组工程先进创新中心,北京100081

出　　处：《材料保护》2022年第12期208-212,共5页Materials Protection

摘　　要：为了解交流干扰下管道阴极保护系统防护交流杂散电流腐蚀的有效性,建立了埋地钢质管道杂散电流干扰的试验装置,研究了阴极保护电流对试片交流腐蚀行为的影响。随着外加直流电压的变化,利用数据记录仪监测了试片阴极保护断电电位、交流电流密度、直流电流密度等参数随时间变化情况。结果表明:在外加直流电流增大和减小的过程中,对试片造成的影响是不可逆的;增大外加直流电流,交流电流密度降低,扩散电阻增大;试验中,随着直流电流增大,阴极保护电位极化到-1.10 V(vs CSE)后,极化电位不再负向偏移,极化过程由电化学控制转为浓差极化控制。通过交直流电流密度比显示,不能仅通过增加阴极保护电流来降低交流干扰程度,需要采用交流排流方式来降低交流干扰的影响。In order to study the effectiveness of pipeline cathodic protection system in preventing AC interference corrosion under AC interference,the testing device for stray current interference of buried steel pipelines was established,and the influence of cathodic protection current on the AC corrosion behavior of test coupons was studied.With the change of the applied DC voltage,the changes of parameters such as the cathodic protection power-off potential,the AC current density and the DC current density of the coupons over time were monitored by data recorders.Results showed that the influence of the increase and decrease of the applied DC current on the test coupons was irreversible;With the increase of applied DC current,the AC current density decreased and the diffusion resistance increased;When the DC current increased,the cathodic protection potential would no longer shift negatively after polarization to-1.10 V(vs CSE),and the polarization process was changed from electrochemical control to concentration polarization control.The ratio of AC to DC current density revealed that,the AC interference could not be reduced simply by increasing the cathodic protection current,and it was necessary to adopt the AC drain method to reduce the impact of AC interference.

关 键 词：交流干扰 阴极保护 电流密度 外加电流 

分 类 号：TG172[金属学及工艺—金属表面处理]