摘要
以电站锅炉水冷壁候选材料T91为研究对象,以12Cr1MoV为对比材料,对两种材料在450℃氧化性气氛、还原性气氛以及氧化-还原交替气氛三种工况下进行高温腐蚀实验研究,通过电镜和能谱对结果进行分析。研究发现:宏观腐蚀增重、腐蚀层厚度及迁移深度三者结合起来能表征材料的腐蚀程度;O与S相互促进的腐蚀模式比单纯H2S腐蚀更严重;Cr2O3对H2S气体的抗腐蚀效果不明显,但是其能够破坏O与S相互促进的腐蚀模式,增强材料的抗腐蚀能力;T91的抗腐蚀能力明显强于12Cr1MoV。
Candidate materials of supercritical and ultra-supercritical utility boiler water wall T91 and 12Cr1MoV were chosen as the experimental samples,and exposed to an oxidizing atmosphere,a reducing atmosphere and an oxidizing/reducing alternating atmosphere respectively.The corrosion temperature was 450℃.The corroded samples were analyzed by scanning electron microscope and energy dispersive spectrometer.To describe the corrosion of the materials accurately,the mass gain,the macro-thickness,and the migration depth were simultaneously analyzed.The combination corrosion of oxygen and sulfur had a stronger corrodibility than that of pure H2S.Cr2O3 had little effect in resisting H2S corrosion,but it can hinder the combination corrosion model.T91 had a stronger corrosion resistance than 12Cr1MoV.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2011年第4期14-19,共6页
Journal of Materials Engineering
基金
"十二五"国家支撑计划重点项目(2011BAK06B04)
关键词
锅炉水冷壁
高温腐蚀
元素迁移
water wall
high temperature corrosion
element migration
