地铁沿线杂散电流对埋地金属管道的腐蚀研究
上海市自来水奉贤有限公司, 上海 201400
| 摘 要： | 今年来，随着我国地铁体系的不断完善，地铁沿线敷设的金属埋地管道出现的严重腐蚀问题受到社会关注。为了探讨其腐蚀机理，文章简述地铁杂散电流对埋地金属管道的腐蚀现状及特点，介绍了地铁杂散电流对埋地金属管的腐蚀速度快、强度大、影响范围广的特点。综述了相应的腐蚀机理，介绍了目前国内外对杂散电流的检测和防护方法。包括管地电位测试、土壤电位梯度测试、试片法或极化探头法测试、电流探针法测试、智能杂散电流检测仪（SCM）检测、腐蚀检查片测试等。提出了“以堵为主，以排为辅，堵排结合，加强监测”的防护方法。 |
| 关 键 词： | 地铁; 杂散电流; 埋地金属管道; 腐蚀防护 |
| DOI： | 10.57237/j.wjese.2023.02.001 |
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收稿日期: 2022-11-04
接受日期: 2022-12-27
在线出版日期: 2023-03-28
Study on Corrosion of Buried Metal Pipeline by Stray Current Along Metro Line
Shanghai Waterworks Fengxian Co., Ltd., Shanghai 201400, China
| Abstract: | This year, with the continuous improvement of China's subway system, serious corrosion problems of metal buried pipelines laid along the subway have attracted social attention. In order to discuss the corrosion mechanism, this paper briefly describes the corrosion status and characteristics of the subway stray current on the buried metal pipes, and introduces the characteristics of the subway stray current on the buried metal pipes, such as fast corrosion speed, large strength and wide influence range. The corresponding corrosion mechanism is summarized, and the detection and protection methods of stray current at home and abroad are introduced. Including pipe to ground potential test, soil potential gradient test, test piece method or polarization probe method test, current probe method test, intelligent stray current detector (SCM) test, corrosion inspection piece test, etc. The protection method of "giving priority to plugging, taking drainage as auxiliary, combining plugging with drainage, and strengthening monitoring" is proposed. |
| Keywords: | Metro; Stray Current; Buried Metal Pipes; Corrosion Protection |
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