城市中水中TP304不锈钢点蚀行为研究  

Pitting corrosion behavior of TP304 stainless steel in urban reclaimed water

作　　者：张贵泉[1] 刘锋[1] 林河 张恒[1] 文慧峰[1] 姚建涛[1] 龙国军[1] ZHANG Guiquan;LIU Feng;LIN He;ZHANG Heng;WEN Huifeng;YAJiantao;LONG Guojun(Xi'an Thennal Power Research Institute Co.,Ltd.,Xi'an 710054,China;Huaneng Hainan Power Generation Co.,Ltd.Dongfeng Power Plant,Dongfeng 572600,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]华能海南发电股份有限公司东方电厂,海南东方572600

出　　处：《热力发电》2019年第12期19-24,共6页Thermal Power Generation

基　　金：中国华能集团有限公司总部科技项目(HNKJ17-H23);国家科技重大专项课题(2018ZX06906013)~~

摘　　要：通过动电位循环极化实验,对TP304不锈钢热网加热器在城市中水中的极化特征进行了研究,得到了95℃下TP304换热管和换热板在城市中水中的点蚀临界Cl^质量浓度,同时考察了金属表面粗糙度和城市中水pH值对TP304换热管点蚀敏感性的影响。结果表明:TP304不锈钢的点蚀敏感性随着Cl^–质量浓度的升高而增加;TP304材质表面状态和城市中水pH值对点蚀临界Cl^–质量浓度具有显著影响;随着金属表面粗糙度的增加和城市中水pH值的降低,临界点蚀Cl^–质量浓度急剧下降。The polarization characteristics of TP304 stainless steel heat exchanger in urban reclaimed water were studied by potentiodynamic cyclic polarization test The pitting critical Cl-mass concentration of TP304 heat pipe and heat plate in urban reclaimed water at 95℃ were obtained.Moreover,the efifects of metal surface roughness and urban reclaimed water pH value on pitting corrosion sensitivity of the TP304 heat exchanger tube were investigated.The results show that,the pitting corrosion sensitivity of the TP304 stainless steel increased with the Cl-mass concentration.The surface state of the TP304 steel and the pH value of the urban reclaimed water had a significant effect on the critical Cl-mass concentration of pitting corrosion.With the increase of metal surface roughness and the decrease of the pH value of urban reclaimed water,the critical Cl-mass concentration of pitting corrosion decreased sharply.

关 键 词：TP304不锈钢 城市中水 热网加热器 点蚀 动电位 循环极化 临界质量浓度 

分 类 号：TM621.8[电气工程—电力系统及自动化]