研究了铁素体-马氏体钢P92在400~600℃、25 MPa 超临界水中的腐蚀行为.用 X 射线衍射(XRD)和扫描电镜-电子能谱(SEM-EDX)分析了氧化膜微观组织,对 P92在超临界水中的腐蚀动力学规律进行了分析.结果表明：温度对腐蚀速率有显著影响,600和500℃的腐蚀增重分别为400℃的5.32倍和1.59倍；400和500℃超临界水中腐蚀动力学遵循立方规律,600℃时近似遵循抛物线规律；氧化膜为双层结构,外层氧化膜为柱状 Fe3 O4相,内层氧化膜为 Fe3 O4和 FeCr2 O4相.
The corrosion behavior of ferritic-martensitic (F-M)steel P92 exposed to static supercritical water (SCW)at 400-600℃ and 25 MPa for 500 h was investigated.The microstructures of oxide scale were analyzed by means of SEM,EDX and XRD,and the corrosion rules for P92 in SCW were also analyzed.The results show that the temperature has a significant influence on the corrosion rate,and corrosion mass gain at 600 and 500℃ is 5.32 and 1.59 times of that at 400℃;the oxidation kinetics curves of P92 follow parabolic law in 400-500℃,and fol-low near-cubic rate law in 600℃;a dual-layered oxide scale is composed of an iron-rich columnar magnetite (Fe3 O4 )in outer oxide layer and a chromium-rich magnetite/spinel-mixed (Fe3 O4/FeCr2 O4 )in inner layer.
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