武汉地铁钢轨在典型隧道环境中的腐蚀现状分析  

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

作　　者：庞涛 刘静[1] 黄峰[1] 李闯[3] 赵国知 黄先球 郑建国 程鹏 PANG Tao;LIU Jing;HUANG Feng;LI Chuang;ZHAO Guozhi;HUANG Xianqiu;ZHENG Jianguo;CHENG Peng(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Central Research Institute,BaoShan Iron&Steel Co.Ltd.,Wuhan 430081,China;Metal&Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081 [2]宝钢股份中央研究院,武汉430081 [3]中国铁道科学研究院金属及化学研究所,北京100081

出　　处：《中国腐蚀与防护学报》2022年第5期798-804,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：中国铁道科学研究院科研项目(2019YJ093)。

摘　　要：走访我国华中地区在役和在建的地铁站点隧道环境,调查钢轨腐蚀状况。对隧道内水质化学成分、钢轨腐蚀产物微观形貌及物相结构进行观察和分析。结果表明,按照钢轨腐蚀程度不同,结合隧道内水质化学成分,可以将钢轨的腐蚀环境分为潮湿大气、污水浸泡、水泥砂浆覆盖及杂散电流。在上述4类服役和存放环境下,钢轨的腐蚀程度均不相同:潮湿大气腐蚀条件下钢轨(在役)腐蚀产物致密、稳定,具有一定的保护性。污水浸泡与水泥覆盖条件下,钢轨(在建)发生了Cl-参与下的鼓泡状局部腐蚀和氧化层全面腐蚀,而杂散电流腐蚀(在用)则直接造成了轨底缺损,是目前所见腐蚀速率最快、程度最重的钢轨腐蚀情况。针对不同环境下的钢轨腐蚀,提出了相应防护措施建议。A corrosion survey was made for the subway rails at Wuhan city of Central China,focusing especially on the corrosion related environments in tunnels of subway stations in service or under construction.The chemical composition of the collected water samples,the microstructure and phase constituents of corrosion products on subway rails were examined.The results show that according to the difference in the corrosion degree of subway rails and the quality of relevant waters collected from various tunnels,the corrosion environments encountered for the subway rails can be divided into four categories:humid atmosphere,sewage immersion,cement mortar as cover,and stray current.As the subway rails in service or storage in the above four types of environments,the corrosion degree of the rails is different:in the humid atmosphere,the formed corrosion products on rails(in service)are compact and stable with protectiveness to certain extent;in the condition of sewage soaking and cement mortar as cover,the rails(under construction)experienced local bubbled corrosion and uniform corrosion with the participation of Cl-;while the stray current induced corrosion(in use)can directly cause the damage of the rail bottom,which is the fastest and the most severe corrosion of the subway rails,what we've seen up to now.In view of the corrosion of rails in different environments,the corresponding protection measures are also put forward.

关 键 词：钢轨 地铁隧道环境 局部腐蚀 杂散电流腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]