武汉地铁钢轨在典型隧道环境中的腐蚀现状分析

庞涛, 刘静, 黄峰, 李闯, 赵国知, 黄先球, 郑建国, 程鹏

Corrosion Survey of Subway Rails in Typical Tunnel Environments at Wuhan Region of Central China

PANG Tao, LIU Jing, HUANG Feng, LI Chuang, ZHAO Guozhi, HUANG Xianqiu, ZHENG Jianguo, CHENG Peng

表1 地铁服役环境因素特征汇总

Table 1 Summary of the characteristics of subway service environmental factors

Environment type Environmental corrosion factor Water quality Location Corrosion degree Humid atmosphere Atmospheric corrosion, temperature 10-30 ℃, humidity 70%-90%RH Neutral electrolyte In most operating sections, the rails do not directly contact water Light corrosion Sewage immersion Construction sewage, air Near neutral electrolyte containing Cl- and SO42- Low-lying prone to water section in the tunnel Light corrosion and local corrosion Cement mortar overlay Portland cement, water, air alkaline electrolyte containing Cl- The section where lay the rail before pouring the concrete Overall corrosion of the rail surface, destroyed oxide scale Stray current Current, deposited salts, cement or other electrolytes Neutral electrolyte Long operation years, water leakage in the tunnel, sand and stones at the bottom of the rail or electrolyte accumulation Rail bottom defect, damaged integrity, severe corrosion