供水管道中球墨铸铁和304不锈钢的电偶腐蚀特性  

Galvanic Corrosion Behavior between Ductile Iron and 304 Stainless Steel in Water Distribution System

作　　者：张海亚 刘迪波 李舒阳 赵律童 张晓健 汪隽 陈超 ZHANG Hai-ya;LIU Di-bo;LI Shu-yang;ZHAO Lii-tong;ZHANG Xiao-jian;Wang Jun;CHEN Chao(State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China;Research Institute for Environmental Innovation Tsinghua,Suzhou 215163,China)

机构地区：[1]清华大学环境学院环境模拟与污染控制国家重点联合实验室,北京100084 [2]清华苏州环境创新研究院,江苏苏州215163

出　　处：《中国给水排水》2019年第17期37-42,共6页China Water & Wastewater

摘　　要：以常用的供水管材球墨铸铁和304不锈钢为试验材料,采用电化学自腐蚀试验和电偶腐蚀试验研究了这两种金属偶接的电偶腐蚀行为,并探讨了阴离子浓度、阴阳极面积比对电偶腐蚀效应的影响。结果表明,球墨铸铁和304不锈钢偶接过程中,球墨铸铁的自腐蚀电位比304不锈钢的要低,当两者偶合后,球墨铸铁作为阳极腐蚀被加剧,而304不锈钢作为阴极受到保护而腐蚀减缓。电偶电位随Cl^-浓度的增大而显著降低,但SO4^2-浓度的增大对其影响不大;电偶电流密度与Cl^-和SO4^2-浓度均呈线性正相关关系。随着阴阳极面积比的增大,电偶电位呈对数增长趋势,而电偶电流密度呈线性增长趋势。Ductile iron and 304 stainless steel were coupled and their galvanic corrosion behaviors were investigated by electrochemical self-corrosion test and galvanic corrosion test,and the effects of anion concentration and cathode/anode area ratio on the galvanic corrosion behaviors were explored.The results showed that ductile iron with relatively lower self-corrosion potential was used as anode and the corrosion was accelerated during the coupling process of ductile iron and 304 stainless steel,while 304 stainless steel was served as cathode and the corrosion process was alleviated.The galvanic corrosion potential decreased with the increase of Cl^-concentration,while it didn't change significantly with the increase of SO4^2-concentration.The galvanic corrosion density was positively correlated with Cl^-and SO4^2-concentration.As the increase of cathode/anode area ratio,the galvanic corrosion potential increased logarithmically,while the galvanic corrosion density increased linearly.

关 键 词：供水管道 电偶腐蚀 球墨铸铁 304不锈钢 

分 类 号：TU991[建筑科学—市政工程]