埋地钢质管道交流杂散电流腐蚀规律研究  

AC Stray Current Corrosion Law of Buried Steel Pipeline

作　　者：王新华[1] 杨国勇[1] 黄海[1] 陈振华 王丽梅 

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100124 [2]中国石油管道公司管道科学研究中心,廊坊065000 [3]北京市市政管理学校,北京102627

出　　处：《中国腐蚀与防护学报》2013年第4期293-297,共5页Journal of Chinese Society For Corrosion and Protection

基　　金："十二五"国家科技支撑计划项目(2011BAK06B01)资助

摘　　要：通过室内模拟实验建立了交流电流密度与破损面积、土壤电阻率、交流干扰电压以及防腐层电阻率之间的数学模型，从而间接获取交流电流密度，并研究了交流电流密度对腐蚀速率的影响。通过CDEGS软件模拟仿真，得到了并行长度、电流等级、距离、土壤电阻率等参数对交流干扰沿管道分布的作用。结果表明，破损面积、交流干扰电压、土壤电阻率、防腐层电阻率对交流杂散电流密度具有显著的影响。电流密度小于3mA／cm^2时，交流电流腐蚀危害性很小；在3～10mA／cm^2时，腐蚀危害性较大；大于10mA／cm^2时，交流腐蚀危害性很大。A lab experimental platform was built to investigate the effect of the AC stray current on the corrosion of buried pipeline. The mathematical model which involved the AC current density, the damage area, soil resistivity, the interference voltage and the coating resistivity was established. The AC current density which would improve efficiency could be obtained indirectly from the model. By using CDEGS software, the distribution law of the parallel length, current rate, distance, soil resistivity and other aspects of AC interference along the pipeline was studied. The results showed that the damaged area, AC interference voltage, soil resistivity and coating resistivity had a significant impact on the AC stray current density. That is, the AC corrosion was small when the current density was lower than 3 mA/cm2; it showed a stronger effect when the current density was between 3 and 10 mA/cm2, and it corroded very heavily when the current density was higher than 10 mA/cm2.

关 键 词：交流杂散电流 埋地钢质管道 腐蚀规律 CDEGS软件 危害性评价 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]