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Fe3O4,有大量孔洞和裂纹缺陷;内层氧化膜的主要成分为Fe3O4和FeCr2O4,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FeCr2O4含量逐渐增加,Fe(Fe,Cr)2O4的尖晶石结构具有保护性,使T91钢在SCW中的腐蚀速率降低.
参考文献
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