研究了氧化物弥散强化钢9Cr-ODS(K3)在500 C/25 MPa条件下的腐蚀行为,对比分析了K3、两种非ODS钢K1 (12Cr)和K2(9Cr)在超临界水(SCW)中的抗腐蚀性能.通过扫描电镜-电子能谱(SEM-EDX)、X射线衍射(XRD)、腐蚀增重等分析了氧化膜的显微形貌、结构、相组成及腐蚀动力学规律.结果表明,K1和K2钢在超临界水中腐蚀后,氧化膜中存在许多小孔,而K3钢中小孔数量很少.K3钢在超临界水中生成的氧化膜分为三层结构,分别为外层氧化膜、内层氧化膜和内氧化区.外层氧化膜为Fe3O4,内层氧化膜为FeCr2O4和Fe3O4相,内氧化区是合金元素和氧由氧化膜向基体逐渐过渡的区域.在超临界水中,K1、K2和K3钢的腐蚀动力学均遵循抛物线规律,K3抗腐蚀性能优于9Cr的K2钢,甚至优于12Cr的K1.
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