亚临界汽包炉全挥发处理环境中氯离子腐蚀行为试验分析  

Corrosion behavior of chlorine ions under all volatile treatment conditions of subcritical drum boilers

作　　者：宋飞[1] 孙浩[1] 田利[1] 邓宇强[1] 刘锋[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032

出　　处：《热力发电》2016年第3期82-86,共5页Thermal Power Generation

基　　金：中国华能集团公司总部科技项目(HNKJ13-H11)

摘　　要：模拟亚临界汽包炉全挥发处理(AVT)环境,在高温无氧碱性条件下,采用电化学和试片表面金相分析方法,对氯离子(Cl-)在水冷壁管内表面(向火侧)发生浓缩时的腐蚀情况,包括不同Cl-质量浓度对金属表面钝态膜的影响,进行了研究。结果表明:当Cl-质量浓度≤3.00mg/L时,金属膜电阻较大,金属膜完整;当Cl-质量浓度>3.00mg/L时,金属膜电阻急剧减小,金属表面出现点蚀,且随Cl-质量浓度增大,金属表面腐蚀加重。Under all volatile treatment（AVT）working conditions of subcritical drum boiler,in high temperature anaerobic alkaline environment,the effect of Cl-on passive film on metal surface when Cl-was concentrated in the inner surface of the wall tube（the side facing the fire）was investigated,by electrochemical online test and the surface topography images.The results show that,when the Cl-concentration is equal or lower than 3.00mg/L,the metal film resistance is large and the metal film is complete.While when the Cl-concentration is higher than 3.00mg/L,the metal film resistance drops sharply,and pitting corrosion occurs on the metal surface.Moreover,the corrosion on the metal surface gets severe with the increasing Cl-concentration.

关 键 词：亚临界 汽包炉 全挥发处理 Cl- 20G 腐蚀 电化学 

分 类 号：TM621.8[电气工程—电力系统及自动化]