研究了铬含量相当、镍含量分别为18wt％和39wt％的两种Fe-Ni-Cr合金在H_2S/H_2/CO_2混合气氛中于600℃的腐蚀动力学和产物层结构。镍含量不同使腐蚀产物结构上有差异:18wt％Ni合金的外腐蚀层为FeS,其下是FeCr_2S_4和Cr_3S_4;而39wt％Ni合金的腐蚀产物外层是疏松多孔、呈黑色粉状的(Ni,Fe)S,其下也是FeCr_2S_4与Cr_3S_4。低含镍合金的腐蚀遵从抛物线规律,高含镍合金的动力学曲线不规则;前者受硫分压的影响不大,而后者的腐蚀增重随硫分压的升高而上升。含镍高的合金腐蚀增重低于含镍低的合金。
The corrosion kinetics and scale structures of two Fe-Ni-Cr alloys containing 18 wt% and 39% nickel respectively were investigated in gassous mixtures of H2S/H2/CO2 at 600℃. The difference in scale structures due to different nickel contents was shown mainly in the outermost layers: with FeS for the 18wt% Ni alloy, while porous and dark(Ni, Fe)S for the 39 wt% Ni one. Both alloys had a middle layer of FeCr2S4 and an inner layer of Cr3S4. The corrosion of the lower nickel content alloy obeyed parabolic law, while that of the higher nickel content alloy showed irregular kinetics. Sulfur pressure affected the 39 wt% Ni alloy more than the 18 wt% Ni alloy. The weight gain of the lower nickel content alloy exceeded that of the higher nickel content alloy.
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