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利用腐蚀增重法,XRD,Raman光谱和SEM研究了核级304不锈钢和铁素体-马氏体耐热钢P92在400℃/25 MPa超临界水中的腐蚀行为.结果表明,2种材料都以均匀腐蚀为主,增重曲线遵循幂指数规律.304不锈钢的腐蚀增重比P92钢低近一个数量级,其氧化膜很薄,局部存在少量的疖状腐蚀.氧化膜主要由Cr_2O_3,α-Fe_2O_3,Fe_3O_4和尖晶石结构氧化物组成.P92钢的氧化膜主要由α-Fe_2O_3,Fe_3O_4和尖晶石结构氧化物组成,表层主要含α-Fe_2O_3.延长腐蚀时间.P92钢表面氧化膜在超临界水中溶解,导致氧化膜形貌由致密的多面体颗粒演化为相互连通的多孔网络结构.
Corrosion behavior of nuclear grade 304 stainless steel and ferritic-martensitic heat-resistant steel P92 in 400 ℃ / 25 MPa supercritical water was studied by means of corrosion weight gain, XRD, Raman spectroscopy and SEM. The results showed that both materials The corrosion rate of 304 stainless steel is nearly one order of magnitude lower than that of P92 steel, and its oxide film is very thin with a small amount of 疖-like corrosion locally. The oxide film mainly consists of Cr 2 O 3, α- Fe_2O_3, Fe_3O_4 and spinel structure oxide.P92 steel oxide film is mainly composed of α-Fe_2O_3, Fe_3O_4 and spinel structure oxide, the surface mainly containing α-Fe_2O_3 extend the corrosion time.P92 steel surface oxide film in the The supercritical water dissolves, resulting in the morphologies of the oxide films evolving from dense polyhedral particles to interconnected porous network structures.