几种耐热钢在超(超)临界水中抗氧化性能的比较
Comparison of Oxidation Resistance of Several Heat Resistant Steels in Supercritical Water
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摘要: 采用电化学阻抗试验、氧化增重法分析了Super304H、P92、15CrMo钢在554, 645 ℃及24 MPa超(超)临界水中氧化44 h后的电化学性能和抗氧化性能, 并用SEM和XRD对氧化膜的表面形貌及物相组成进行了分析。结果表明: Super304H 钢氧化后没有明显的质量变化, P92钢和15CrMo钢有氧化增重现象, 但氧化增重的差异不明显; Super304H钢表面由细小的针状或颗粒状的含铁和铬的氧化物组成, P92钢和15CrMo钢表面为相对较大的颗粒状Fe3O4组成; 554 ℃超临界水氧化后在NaCl溶液中的阻抗由小至大顺序为P92、Super304H、15CrMo钢, 随温度升高阻抗增大; 电化学阻抗可在短时氧化条件下有效分析耐热钢的抗氧化特性。Abstract: The electrochemical property and oxidation resistance of Super304H, P92 and 15CrMo steels after being oxidized in supercritical water at temperature of 554, 645 ℃ and pressure of 24 MPa for 44 h were studied by electrochemistry impedance spectra (EIS) and weight increment test. The surface morphology and phase analysis of oxide films were examined by SEM and XRD. The results show that the mass of Super304H steel had no obvious change. The mass increment of P92 steel and 15CrMo steel was evident after oxidation, but there was no obvious difference between them. Surface product on Super304H was composed of tiny acicular or granular oxides containing Fe and Cr elements, while the oxide scales on P92 steel and 15CrMo steel were composed of Fe3O4 particles. The impedance sequence of the samples in NaCl solution after oxidation in supercritical water at 554 ℃ was P92
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