研究了奥氏体不锈钢AL-6XN在550℃,600℃和650℃超临界水中的腐蚀行为.采用扫描电镜、X射线能谱仪和X射线衍射仪观察氧化膜的腐蚀形貌、组织结构及元素成分分布.结果表明,AL-6XN不锈钢在超临界水中氧化膜的生长服从固态生长机制,600℃时的腐蚀增重量约为550℃时的3倍,而650℃时其腐蚀增重出现了大幅下降.试样表层形成了富Fe的磁晶石结构腐蚀产物颗粒,其氧化膜呈现双层结构,外层为Fe3O4结构,内层为FeCr2O4和(Ni,Fe)Fe2O4混合尖晶石结构.
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