4J50铁镍合金在空气中的氧化行为

摘要

研究4J50铁镍合金在500~520℃空气中、22%~60%湿度范围内的氧化规律和氧化动力学，利用扫描电镜(SEM)、能谱仪(EDS)和X射线衍射(XRD)对氧化膜的形貌和相组成进行分析。结果表明：在氧化初期，基体表面生成不连续的氧化膜，其主要成分为Fe2O3；氧化时间为10~15 min时，生成均匀的氧化膜，其主要成分为Fe2O3和Fe3O4；提高氧化温度和相对湿度可加快4J50铁镍合金的氧化过程，相对湿度高于60%会显著降低氧化膜的粘附性。%Oxidation rules and kinetics of 4J50 Fe-Ni alloy under air atmosphere condition at different temperatures (500~520℃) and different relative humidities (22%~60%) were studied. Phase composition and morphology of oxide film were analyzed by SEM and EDS, XRD. Results show that a discontinuous oxide film generates on the surface of 4J50 Fe-Ni alloy in the initial stage of oxidation. The main phase composition of the oxide film is Fe2O3. After 10~15 min oxidation, an uniform and continuous oxide film generates on the surface. The main phase composition of the oxide film is Fe2O3 and Fe3O4. With increasing the oxidation temperature and relative humidity, the oxidation process of 4J50 Fe-Ni alloy accelerates. When the relative humidity is higher than 60%, the adhesion of the oxide film significantly decreased.