气固相硫协同作用下水冷壁的高温腐蚀特性  

Characteristic for high temperature corrosion of water wall tube under gas-solid phase sulfur

作　　者：王健[1] 黄亚继[1] 邹磊[2] 岳峻峰[2] 徐力刚[1] 杨钊[1] 查健锐 夏文青[1] 

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096 [2]江苏方天电力技术有限公司,江苏南京211102

出　　处：《化工进展》2018年第2期452-458,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金项目(51676040)

摘　　要：利用高温管式炉对电站锅炉水冷壁受热面常用的两种管材(12Cr1Mo VG和15Cr Mo G)开展高温腐蚀实验研究,采用腐蚀增重法,得出气相硫、气固相硫作用下试片的腐蚀动力学曲线,并利用SEM和EDS对腐蚀试片表面及断面的微观形貌和元素成分进行分析。结果表明:两种材料的腐蚀动力学曲线都满足双对数曲线规律,气固相硫协同作用对金属的腐蚀性强于单因素气相硫的影响,15Cr Mo G的抗腐蚀性能优于12Cr1Mo VG;腐蚀层大致可以分为3层,依次为剥离叶片层、过渡层和腐蚀渗透层,气相硫腐蚀下腐蚀层较厚并且质地紧密,气相硫与固相硫协同腐蚀下腐蚀层较薄并且质地疏松,极易剥落;此外腐蚀层中存在硫元素富集现象,腐蚀渗透层中的硫元素质量分数高达6.65%,并且氧元素含量从金属基体表面到腐蚀层表面呈现递增规律。The high temperature corrosion experiments of power plant boiler water wall tube materials（12 Cr1 Mo VG and 15 Cr Mo G）have been made using the test bed-high temperature tube furnace. Corrosion mass gain method was used to gain the corrosion kinetics curve under gas phase sulfur and gas-solid phase sulfur. Furthermore,the micromorphology and element contents of corrosion test block were analyzed by SEM and EDS. The results showed that the corrosion kinetics of 12 Cr1 Mo VG and 15 Cr Mo G can be described by the double logarithmic equation. The corrosivity of interaction conditions was much stronger than that of gaseous S. The corrosion resistance of 15 Cr Mo G was superior than that of 12 Cr1 Mo VG. It is revealed that the corrosion layer can be roughly divided into three layers,namely,stripping blade layer,transition layer and corrosion permeability layer. When exposed to the condition of gas phase sulfur,the corrosion layer is thick and compact. When exposed to the interaction conditions of gas phase sulfur and solid phase sulfur,the corrosion layer is thin,brittle and easy to spall. In addition,the concentration of sulfur is present in the corrosion layer,and the sulfur mass fraction in corrosion permeability layer is as high as 6.65%. The oxygen content increases from the surface of the metal substrate to the surface of the corrosion layer.

关 键 词：高温腐蚀 水冷壁材料 气固相硫 元素迁移 

分 类 号：TK224.94[动力工程及工程热物理—动力机械及工程]