Abstract The corrosion behavior of 14Cr ODS steel exposed to the supercritical water (SCW) at 600 °C under 25 MPa with the dissolved oxygen content of 300 ppb was investigated. The weight gain measurement and corrosion layers analysis were used to determine the corrosion behavior and corrosion mechanism of the 14Cr ODS steel. The results indicate that the 14Cr ODS steel exposed in this work possesses better corrosion resistance than the other ODS steel with a similar composition. Both uniform corrosion regions and nodular corrosion regions can be seen on the exposed specimens, which is due to the bimodal microstructure of the ODS steel. The corrosion products have a multi-layer structure, including the outer oxide layer, the inner oxide layer, and the transition layer. The oxide in the inner layer is FeCr2O4. The oxides in the outer layer change from the initial Fe3O4 to Fe2O3 with the increase of exposure time. The possible corrosion mechanism is analyzed as well, combining with the microstructure characters of the 14Cr ODS steel.

中文翻译：

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铁素体ODS钢在超临界水中的氧化行为分析

摘要 研究了 14Cr ODS 钢在 600 °C、25 MPa、300 ppb 溶解氧含量的超临界水 (SCW) 中的腐蚀行为。通过增重测量和腐蚀层分析来确定14Cr ODS钢的腐蚀行为和腐蚀机理。结果表明，本工作中暴露的 14Cr ODS 钢比具有相似成分的其他 ODS 钢具有更好的耐腐蚀性。由于 ODS 钢的双峰微观结构，在暴露的试样上都可以看到均匀腐蚀区域和球状腐蚀区域。腐蚀产物具有多层结构，包括外氧化层、内氧化层和过渡层。内层的氧化物是FeCr2O4。随着暴露时间的增加，外层的氧化物由最初的Fe3O4转变为Fe2O3。并结合14Cr ODS钢的显微组织特征分析了可能的腐蚀机理。