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High-temperature corrosion of titanium-, niobium-, and manganese-rich Fe-25Cr alloys in H2-H2O-H2S gas mixtures
Authors:C. R. Wang  W. Q. Zhang  R. Z. Zhu
Affiliation:(1) Department of Surface Science and Corrosion Engineering, University of Science and Technology Beijing, 100083 Beijing, P. R. China
Abstract:
The simultaneous sulfidation and oxidation of Fe-25Cr, Fe-25Cr-4.3Ti, Fe-25Cr-7.5Nb, and Fe-25Cr-9.0 Mn alloys were studied at 1023, 1123, and 1223 K, respectively, in H2-H2O -H2S gas mixtures. The influences of titanium, niobium, and manganese on the transition from protective oxide formation to the formation of sulfide-rich corrosion products of Fe-25Cr alloys have been investigated. It has been found that additions of titanium and niobium can improve the scaling resistance of Fe-25Cr alloys against sulfidation in H2 -H2O -H2S gas mixtures at high temperatures. However, the addition of manganese does not increase the resistance to sulfidation of Fe-25Cr alloy. The oxide Cr2Ti2O7, which can suppress sulfide formation, formed on the Fe-25Cr-4.3Ti alloy. The addition of manganese to Fe-25Cr does not form more stable and protective oxides than Cr2O3 which formed on Fe-25Cr. Thermodynamic stability diagrams are used to explain the experimental results.
Keywords:simultaneous sulfidation and oxidation  transition from protective oxide formation to sulfide formation  titanium-, niobium-, and manganese-rich Fe-25Cr alloys  Fe-25Cr alloy
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