交流杂散电流与应力耦合对涂层破损管道腐蚀行为影响  

Effect of AC Stray Current and Stress Coupling on Corrosion Behavior of Coated Damaged Pipelines

作　　者：董欢 马贵阳[1] 孙东旭[1] DONG Huan;MA Gui-yang;SUN Dong-xu(School of Petroleum and Natural Gas Engineering,Liaoning Petrochemical University,Fushun 113005,China)

机构地区：[1]辽宁石油化工大学石油与天然气工程学院,抚顺113005

出　　处：《科学技术与工程》2025年第3期1039-1046,共8页Science Technology and Engineering

基　　金：国家自然科学基金(52274062);辽宁省博士科研启动基金(2023-BS-198);辽宁省教育厅基本科研项目(LJKMZ20220734)。

摘　　要：由于埋地管线与高压电线、城市轨道交通供电系统等电力设施选址类似,导致埋地管道越来越频繁地受到来自电力设施产生的杂散电流影响。通过模拟分析交流杂散电流对管道涂层破损处腐蚀量的影响,研究了交流电流大小、土壤电导率、管道内压、应力、接地极距离和管道半径等参数对腐蚀的影响。结果显示,当管道应力小于屈服强度时,应力对交流杂散电流的腐蚀影响较小,但管道形变增加后,应力将引起严重腐蚀。交流电流越大,管道涂层缺陷处腐蚀量越大。交流电频率越小,管道涂层缺陷处腐蚀量越大。接地极距离管道越近,管道涂层缺陷处腐蚀量越大。土壤的电导率越大,管道涂层缺陷处腐蚀量越大。管道半径越小,管道涂层缺陷处腐蚀量越大。研究成果对确保交流杂散电流影响下油气输送管道的安全运行具有重要意义。Due to the similarity in site selection between underground pipelines and power facilities such as high-voltage power lines and urban rail transit power supply systems,underground pipelines are increasingly affected by stray currents generated by power facili-ties.The impact of AC stray currents on the corrosion rate of pipeline coating defects were simulated and analyzed.The effects of pa-rameters such as AC current magnitude,soil conductivity,internal pressure of the pipeline,stress,distance to grounding electrode,and pipeline radius on corrosion were investigated in the study.The results indicate that when the stress on the pipeline is less than the yield strength,the effect of stress on the corrosion caused by AC stray currents is relatively small.However,after the deformation of the pipeline increases,serious corrosion will be induced by stress.The greater the AC current,the greater the corrosion at the defects of the pipeline coating.The lower the AC frequency,the greater the corrosion at the defects of the pipeline coating.The closer the dis-tance to the grounding electrode,the greater the corrosion at the defects of the pipeline coating.The higher the soil conductivity,the greater the corrosion at the defects of the pipeline coating.The smaller the pipeline radius,the greater the corrosion at the defects of the pipeline coating.These research findings are of significant importance for ensuring the safe operation of oil and gas transportation pipelines under the influence of AC stray currents.

关 键 词：交流杂散电流 应力 涂层破损 数值模拟 

分 类 号：TE88[石油与天然气工程—油气储运工程]