T91钢在超临界水环境中的腐蚀性能  

Corrosion Behavior of T91 Steel in Supercritical Water

作　　者：高文华[1] 沈朝[1] 张乐福[1] 

机构地区：[1]上海交通大学核能科学与工程学院,上海200240

出　　处：《腐蚀与防护》2016年第6期444-448,502,共6页Corrosion & Protection

基　　金：国家重点基础研究发展规划(973计划)项目(2007BC209802)

摘　　要：在超临界水(SCW)环境中对新型铁素体/马氏体钢T91进行了不同时间的高压釜浸泡试验,采用SEM、EDS和XRD等方法对试样表面的腐蚀氧化膜进行了分析。结果表明:T91钢在超临界水环境中的氧化符合固态生长机制,材料表面生成了保护性氧化膜;外层氧化膜的主要成分是Fe_3O_4,有大量孔洞和裂纹缺陷;内层氧化膜的主要成分为Fe_3O_4和FeCr_2O_4,结构致密,随浸泡时间的延长氧化膜分层逐渐清晰;内层氧化膜中FeCr_2O_4含量逐渐增加,Fe(Fe,Cr)_2O_4的尖晶石结构具有保护性,使T91钢在SCW中的腐蚀速率降低。The corrosion behavior of ferritic/martensitic steel T91 in supercritical water （SCW） was investigated by immersion test in autoclave for different times, and the oxide films on the surface of samples were characterized using SEM, EDS and XRD techniques. The results show that a dual-layer protective oxide film formed in SCW, consisting of an outer layer with Fe3O4 and an inner layer with Fe3O4 and FeCr2O4. The oxidation fellowed the solid state growth rule. The boundaries between oxide layers became evident with increasing immersion time. The increasing content of FeCr2O4 in inner layer and the protectiveness of Fe（Fe,Cr）2O4 spinel made the corrosion rate decreased.

关 键 词：马氏体钢T91 超临界水 腐蚀性能 

分 类 号：TG172[金属学及工艺—金属表面处理]