700℃超超临界机组锅炉用617B合金的烟气腐蚀行为研究  

Fire-side corrosion behavior of Alloy 617 Bused for 700 ℃ ultra-supercritical unit boiler

作　　者：毕凯[1] 周荣灿[1] 唐丽英[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2期68-74,共7页Thermal Power Generation

基　　金：国家能源局国家能源应用技术研究及工程示范项目(NY20110102)

摘　　要：使用自制的烟气腐蚀试验装置,在模拟燃用贵州六枝烟煤的烟气/煤灰环境中,研究700℃时617B合金的腐蚀行为。通过光学显微镜、扫描电镜、X射线能谱和X射线衍射,对617B合金的腐蚀层形貌、成分和物相组成进行分析。结果表明:试验前120h,617B合金表面生成了具有保护作用的Cr2O3保护膜,腐蚀速率低;之后,腐蚀速率增大,腐蚀层物相主要为NiCr2O4和少量的CoCr2O4。Fire-side corrosion behavior of Alloy 617 Bat 700℃ was evaluated in stimulated coal-ash and flue gas environment firing Liuzhicoal with high S content,on a self-built lfue gas corrosion test device.The morphology,composition and phase constitution of the Alloy 617 Bwere characterized through several analysis,such as the light optical microscopy（LOM）,scanning electron microscopy（SEM）,energy dispersive X-ray spectroscope（EDX）and X-ray diffraction（XRD）.The results show that,aprotective Cr2O3 layer formed on the Alloy 617 Bsurface during the initial stage（within 120h）with a low corrosion rate.Then the corrosion rate increased,the specimen suffered severe corrosion,and the production on the Alloy 617 B surface is mainly NiCr2O4 and a little CoCr2O4.

关 键 词：超超临界 锅炉 烟气腐蚀 700℃ 617B合金 腐蚀速率 物相 

分 类 号：TG172.8[金属学及工艺—金属表面处理] TK224.9[金属学及工艺—金属学]