Electrochemical corrosion to urban gas pipeline induced by metro stray current

Author of the article:MA Jiansheng, OUYANG Kai, ZHAO Yunyun, HE Zhixin

Author's Workplace：Guangzhou Metro Group Co., Ltd., Guangzhou, Guangdong, 510220, China

Key Words：Metro stray current; Urban gas pipeline; Stray current corrosion; Corrosion monitoring; Corrosion protection

Abstract：Stray currents cause severe electrochemical corrosion to various buried metal structures. Gas pipelines are densely distributed in urban areas, and the phenomenon of stray current corrosion cannot be ignored. In recent years, gas pipeline leakage accidents caused by stray current corrosion have occurred frequently, and managing urban gas pipeline stray current corrosion is a matter of great urgency. In order to clarify the future development direction, current research status of stray current corrosion of gas pipelines are summarized. Based on the research results of stray current corrosion on buried pipelines at home and abroad, the current status of stray current distribution and electrochemical corrosion research is analyzed, and the operating characteristics of urban gas pipelines and the inherent scientific issues of stray current corrosion are summarized. Meanwhile, the corrosion monitoring and detection methods of urban gas pipelines and protective technologies are introduced, and the outlook on future development of stray current corrosion research on gas pipelines is proposed. Conclusions points to the future directions that need to be further explored, namely accurate measurement and feature reconstruction methods of stray current signals in gas pipelines; electrochemical corrosion behavior under dynamic current excitation with time domain characteristics of stray currents; Corrosion feature quantification and prediction methods for stray currents in urban gas pipelines. The results provide reference for related research on stray current corrosion protection and monitoring of urban gas pipelines.