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采用不连续称重法测得了奥氏体耐热不锈钢309S在不同温度下的高温氧化动力学曲线,结果表明309S钢高温氧化动力学曲线遵循抛物线规律。利用扫描电镜、X射线衍射和XPS的方法对氧化膜表面的形貌及化学元素沿氧化膜纵深方向的分布情况进行了研究,发现各温度下的氧化膜均均匀覆盖于基体表面;500℃下氧化膜氧化产物表层主要为Cr2O3和Fe2O3,内层主要为Cr2O3和NiO;1 000℃下氧化膜表层主要成分为Cr2O3、NiO、Fe3O4或Fe2O3,氧化膜内层基本不含NiO,主要为Cr2O3、Fe3O4或Fe2O3。
The discontinuous weighing method was used to measure the oxidation kinetics of austenitic stainless steel 309S at different temperatures. The results showed that the oxidation kinetics of 309S steel followed the parabolic law. The morphology of the oxide film surface and the distribution of chemical elements along the depth direction of the oxide film were investigated by SEM, XRD and XPS. The results showed that the oxide film uniformly covered the surface of the substrate at 500 ℃ The main oxide layer oxide film is Cr2O3 and Fe2O3, the inner layer is mainly Cr2O3 and NiO; the main surface layer of oxide film at 1000 ℃ is Cr2O3, NiO, Fe3O4 or Fe2O3, the inner oxide film basically does not contain NiO, mainly Cr2O3, Fe3O4 or Fe2O3.