采用增重法对奥氏体不锈钢AL-6XN在500℃／25MPa超临界水（SCW）中的腐蚀行为进行试验研究，利用SEM和XRD对表面氧化膜的成分和结构进行了分析。结果表明，AL-6XN在SCW中的腐蚀动力学遵循抛物线规律，局部表面发生了点蚀；氧化膜为双层结构，内层为致密的Cr2O3和FeCr2O4混合物，外层为较疏松的Fe3O4且分布着氧化物颗粒。
Corrosion behavior of AL-6XN exposed in supercritical water (SCW) at 500℃/25 MPa was investigated by means of gravimetry, and the structure and chemical composition of the oxide films were examined by scanning electron microscopy (SEM) equipped with an energy-dispersive X-ray spectrometer (EDS) and X-ray diffraction (XRD). The results show that AL-6XN approximately followed parabolic oxidation kinetics the SCW conditions. Pits can be observed on AL-6XN samples exposed in SCW. Duplex layer oxide structures under eonposing of a compact inner Cr2O3/FeCr2O4 mixture layer and porous Fe3O4 outer layer developed on all samples exposed to SCW, oxide particles can be observed on sample surface.
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