INFLUENCE OF Al ON HIGH TEMPERATURE SULFIDATION OF AN Fe-25Cr ALLOY IN H2S-H2 GAS MIXTURES
(1.Department of Surface Science and Corrosion Engineering; University of Science and Technology Beijing; Beijing 100083; China;
2.Northeastern Unirersity; Shenyang 110006; China)
2.Northeastern Unirersity; Shenyang 110006; China)
Abstract: The effects of 5 wt.-% Al and 10 wt.-% Al on the sulfidation behaviour of the Fe-25Cr alloy in H2S-H2 gas mixtures in the temperature range of 700～900 C has been studied.The sulfidation resistance of Fe-25Cr was improved and the sulfide scale morphologies,composition and structure of Fe-25Cr changed remarkably.The sulfidation kinetics of the alloys with alu- minium obeyed basically the parabolic law after an initial period of reaction time.The sulfida- tion mechanism of the Fe-Cr-Al alloy has been proposed.
Key words: Al; Fe-25Cr; H2S-H2 gas mixtures; sulfidation