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研究了铁素体-马氏体钢P92在400~600℃、25MPa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Fe_3O_4相,内层氧化膜为Fe_3O_4和FeCr_2O_4相。
The corrosion behavior of ferritic-martensitic steel P92 in supercritical water at 400-600 ℃ and 25 MPa was studied. The microstructure of the oxide film was analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM-EDX). The corrosion kinetics of P92 in supercritical water was analyzed. The results show that the temperature has a significant effect on the corrosion rate, and the corrosion weights at 600 and 500 ℃ are 5.32 and 1.59 times higher than those at 400 ℃ and 400 ℃, respectively. The corrosion kinetics in 400 and 500 ℃ supercritical water follow the cubic law, The oxide film has a double-layer structure, the outer oxide film is a columnar Fe_3O_4 phase, and the inner oxide film is Fe_3O_4 and FeCr_2O_4 phases.