Oxidation of AISI 304L and 348 Stainless Steels in Water at High Temperatures

Oxidation of AISI 304L and 348 stainless steels was investigated in water at 1000 – 1350 °C by TGA, SEM, EDS, and Raman spectroscopy. Linear-Parabolic kinetics and multilayer oxide scales with voids were found for both alloys. Based on the experimental results, AISI 304L presented higher oxidation resistance and higher activation energy. Zircaloy-4 kinetic results were used for validation and performance comparison. In severe accidents conditions, stainless steel might lead to a faster hydrogen production comparing to Zircaloy.

本研究采用热重分析法（Thermogravimetric Analysis, TGA）、扫描电子显微镜（Scanning Electron Microscopy, SEM）、能谱仪（Energy Dispersive Spectroscopy, EDS）及拉曼光谱法，在1000~1350℃的水环境中，针对AISI 304L与348不锈钢的氧化行为展开了系统研究。结果显示，两种合金均表现出线性-抛物线氧化动力学特征，且均生成带有孔隙的多层氧化皮结构。基于实验数据，AISI 304L展现出更优异的抗氧化性能与更高的氧化活化能。本研究以锆合金-4（Zircaloy-4）的氧化动力学测试结果作为参照，用于验证实验结论并开展性能对比分析。在严重事故工况下，不锈钢的产氢速率相较于锆合金-4更快。