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利用建立的用于强腐蚀性气氛高温腐蚀研究的连续称重测量装置,测定了Fe-25Cr铁素体合金在H_2-H_2S混合气氛中700～900℃及10~(-1)～10~(-3)Pa硫分压条件下的硫化行为。在经过初始孕育期之后,Fe-25Cr合金的硫化动力学符合分段抛物线规律。其腐蚀产物是双层结构:外层为品粒粗大的(FeCr)_(1-x)S(x≈0.24.21at％～0at％Cr);内层是较薄的(CrFe)S_x(26.8at％Cr)等轴晶层。硫化过程受Fe,Cr离子向外扩散的控制。
By using the continuous weighing measurement device established for the study of high temperature corrosion in strongly corrosive atmosphere, the effects of temperature, temperature and pressure on the corrosion resistance of Fe-25Cr ferritic alloy were investigated at 700 ~ 900 ℃ and 10 ~ (-1) ~ 10 ~ -3) Pa sulfur partial pressure vulcanization behavior. After the initial incubation period, the kinetics of the vulcanization of Fe-25Cr alloy accord with the law of piecewise parabola. The corrosion products are two-layer structure: the outer layer is coarse (FeCr) _ (1-x) S (x≈0.24.21at% ~ 0at% Cr); the inner layer is thinner (CrFe) S_x at% Cr) equiaxed layer. Vulcanization process controlled by outward diffusion of Fe and Cr ions.