High Temperature Corrosion Behavior of T91 in Alkali Metal Chloride Medium
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Fe2O3和(Fe0.6Cr0.4)2O3, 同时含有少量的Fe3O4和K2Fe4O7。
Abstract
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 T91 was very sensitive to the gaseous-phase of KCl 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 K2Fe4O7.
中图分类号 TG172.8 DOI 10.11973/fsyfh-201511003
所属栏目 试验研究
基金项目 广东电网有限责任公司电力科学研究院项目(14430101000950)
收稿日期 2014/11/3
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备注李宇春(1972-), 教授, 博士, 从事电厂化学、材料腐蚀与防护等方面研究,
引用该论文: HE Yu-wu,LI Yu-chun,ZHANG Hong-liang,LI Mei,XU Zhao-jin,ZHONG Feng,YANG Fan. High Temperature Corrosion Behavior of T91 in Alkali Metal Chloride Medium[J]. Corrosion & Protection, 2015, 36(11): 1021
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参考文献
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【12】庞飞飞. 620 ℃条件下T/P92耐热钢的腐蚀行为[J]. 腐蚀与防护,2013,34(12):1086-1089.
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