High Temperature Sulfldation of An Fe-25Cr Alloy in H<sub>2</sub>-H<sub>2</sub>S Mixed Gases

Qi Huibin; Zhu Rizhang; He Yedong; Sun Guangjing

doi:10.13374/j.issn1001-053x.1993.04.018

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Qi Huibin, Zhu Rizhang, He Yedong, Sun Guangjing. High Temperature Sulfldation of An Fe-25Cr Alloy in H2-H2S Mixed Gases[J]. Chinese Journal of Engineering, 1993, 15(4): 414-418. doi: 10.13374/j.issn1001-053x.1993.04.018

Citation:

Qi Huibin, Zhu Rizhang, He Yedong, Sun Guangjing. High Temperature Sulfldation of An Fe-25Cr Alloy in H₂-H₂S Mixed Gases[J]. Chinese Journal of Engineering, 1993, 15(4): 414-418. doi: 10.13374/j.issn1001-053x.1993.04.018

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High Temperature Sulfldation of An Fe-25Cr Alloy in H₂-H₂S Mixed Gases

doi: 10.13374/j.issn1001-053x.1993.04.018

Department of Surface Science and Corrosion Engineering

Received Date: 1992-08-21
Available Online: 2021-10-18

Abstract

Abstract

An experimental assembly has been set up, which was suitable for the investigation of high temperature corrosion in strong corrosive gases and the continuous weight gain measurement. The investigation of sulfidation behaviour of an Fe-25Cr ferrous alloy in H₂-H₂S mixed gases at 700~900℃ and 10^-1~10^-3Pa suphur partial pressure has been carried out. After an early slow transient period of sulfidation,the kinetics of Fe-25Cr alloy obeyed to different parabolic laws. The corrosion product comprised of an (FeCr)_1-xS(x≈ 0.24,21 at%~0 at%Cr) out layer of coarse grains and a thin (CrFe)S_x innerlayer of aquiaxial grains. The sulfidation procedure was controlled by the outwards diffusions of Fe, Cr cations.
- Fe-25Cr alloy,
- high temperature sulfidation,
- corrosion