研究了氧化物弥散强化钢9Cr-ODS(K3)在500 ℃/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。

The oxidation behavior of a 9Cr oxide dispersion strengthened (ODS) steel exposed to supercritical water at 500 ℃ and 25 MPa was examined. For comparison, two non-ODS steels K1 (12Cr) and K2 (9Cr) were also examined. The oxidized samples were characterized using gravimetry, scanning electron microscopy/energy dispersive X-ray spectroscopy and X-ray diffraction. The oxide scales were rather porous in two non-ODS steels K1 and K2, while the porosity in 9Cr-ODS almost couldn′t be observed. A three-layered oxide scale formed on 9Cr-ODS steel, which was mainly composed of an outer oxide layer (Fe3O4), an inner oxide layer (Fe3O4 + FeCr2O4) and an internal oxide zone which was featured by gradual variation of alloying elements and oxygen from the oxide to the matrix. The kinetic data of 9Cr-ODS, two non-ODS steels showed that oxide scale formation obeyed a parabolic rate law. The oxidation rate of 9Cr-ODS steel was lower than that of K2 (9Cr), even more it was lower than that of K1 (12Cr).