埋地燃气管道直流杂散电流腐蚀与应力场耦合仿真  

Coupling Simulation of Direct Stray Current Corrosion and Stress Field of Buried Gas Pipeline

作　　者：伏喜斌 徐火力 杨阳 闫福磊 FU Xi-bin;XU Huo-li;YANG Yang;YAN Fu-lei(Xiamen Special Equipment Inspection Institute,Xiamen 361004,China;Xiamen Key Laboratory of Marine Corrosion and Intelligent Protection Materials,Marine Engineering College,Jimei University,Xiamen 361021,China)

机构地区：[1]厦门市特种设备检验检测院,福建厦门361004 [2]厦门市海洋腐蚀与智能防护材料重点实验室,集美大学轮机工程学院,福建厦门361021

出　　处：《管道技术与设备》2022年第6期49-52,共4页Pipeline Technique and Equipment

摘　　要：为了分析在不同腐蚀条件下管道涂层破损处的腐蚀电流分布规律,文中分别对应力腐蚀、直流杂散电流腐蚀以及二者耦合的情况进行了数值模拟研究。研究发现,应力腐蚀情况下,当应变水平引起缺陷中心塑性变形时,阳极电流集中在缺陷中心处,并且随着应变的增加,这种集中趋势越来越显著;直流杂散电流腐蚀情况下,杂散电流在缺陷处的局部电流密度分布呈现两头翘起中部略微凹陷的形状;当二者耦合时,涂层腐蚀缺陷处的局部电流密度分布是应力腐蚀电流密度分布规律和杂散电流腐蚀电流密度分布规律共同作用的结果。To analyze the rule of corrosion current distribution in the place of damaged pipe coating under different corrosion conditions,the stress corrosion,direct stray current corrosion and their coupling conditions were studied by numerical simulation.The results show that in terms of stress corrosion,anode current can concentrate at defect center because of plastic deformation caused by axial strain,and the degree of this kind of concentration increases with the growth of axial strain.In the case of direct stray current corrosion,the local current density distribution of the stray current at the defect shows the shape that the two ends are warped and the middle part is slightly depressed.When they are coupled,the local current density distribution of coating corrosion defects is the result of the joint action of stress corrosion current density distribution and stray current corrosion current density distribution.

关 键 词：腐蚀 杂散电流 应变 数值仿真 燃气管线 

分 类 号：TE98[石油与天然气工程—石油机械设备]