T91钢在碱金属氯化物介质中的高温腐蚀行为  

High Temperature Corrosion Behavior of T91 in Alkali Metal Chloride Medium

作　　者：何玉武[1] 李宇春[1] 张宏亮[2] 李梅[1] 徐召金 钟峰[1] 杨帆[1] 

机构地区：[1]长沙理工大学化学与生物工程学院,长沙410114 [2]广东电网公司电力科学研究院化学所,广州510080

出　　处：《腐蚀与防护》2015年第11期1021-1025,1076,共6页Corrosion & Protection

基　　金：广东电网有限责任公司电力科学研究院项目(14430101000950)

摘　　要：模拟生物质电厂锅炉过热器的烟气侧环境,对过热器材料T91进行了高温腐蚀研究。采用试样腐蚀增重试验,测得了腐蚀动力学曲线;采用扫描电镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)等,对T91试样腐蚀后的形貌、结构、元素含量和腐蚀产物的组成进行了分析。结果表明,T91的腐蚀对KCl蒸汽和反应温度比较敏感,随着温度的增高,腐蚀速率增加,腐蚀动力学曲线基本符合抛物线规律;T91的主要腐蚀产物为Fe_2O_3和(Fe_(0.6)Cr_(0.4)))2O)3,同时含有少量的Fe_3O_4和K_2Fe_4O_7。The corrosion behavior of T91 was studied by simulating the gas-side condition in super-heater of a biomass power plant. The corrosion kinetics curves were obtained through mass gain. By SEM, EDS and XRD, the appearance, microstructure, element contents and composition of corrosion products on the samples after corrosion were analyzed. The results showed that the corrosion of Tgl was very sensitive to the gaseous-phase of KC1 and the reaction temperature, as the reaction temperature increased, the corrosion-resistant behavior of T91 reduced and the corrosion kinetics of T91 steel was in line with parabolic law. The main components of the corrosion product were Fe2O3 and （Fe0. 6Cr0. 4）2O3 , a small amount of Fe3O4 and K2Fe4OT.

关 键 词：T91 生物质电厂 过热器 碱金属氯化物 高温腐蚀 

分 类 号：TG172.8[金属学及工艺—金属表面处理]