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The Corrosion Behavior of Sulfidation-Resistant Fe–Mo–Al Alloys in H2/H2S Atmospheres at 900°C

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Abstract

The corrosion behavior of Fe–22Mo–10Al (a/o, atom %),Fe–20.5Mo–15.7Al, and Fe–10Mo–19Al was examined inflowing H2/H2S gases of 4 Pa sulfur partial pressureat 900°C. Al2O3 was stable on all the alloys inthe atmospheres investigated. Fe–22Mo–10Al andFe–20.5Mo–15.7Al reacted slowly, following the parabolic ratelaw. Multilayered reaction products were formed on these alloys and it isuncertain which layer(s) provided the protection. Fe–10Mo–19Alreacted even more slowly, exhibiting two-stage parabolic kinetics. Duringthe early stage of this alloy's reaction, a preferential reaction zone,consisting of an oxide mixture, possibly Al2O3+FeAl2O4,and nonreacting Fe3Mo2, provided the protection. Duringthe later reaction stage, the formation of a continuous, externalAl2O3 layer further decreased the alloy reaction rate.

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Author notes

  1. R. Y. Chen

    Present address: Melbourne Laboratories, BHP Research, P.O. Box 264, Clayton South, Victoria, 3169, Australia

Authors and Affiliations

  1. School of Materials Science and Engineering, The University of New South Wales, Sydney, 2052, Australia

    R. Y. Chen

  2. School of Materials Science and Engineering, The University of New South Wales, Sydney, 2052, Australia

    D. J. Young & S. Blairs

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  2. D. J. Young
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  3. S. Blairs
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Chen, R.Y., Young, D.J. & Blairs, S. The Corrosion Behavior of Sulfidation-Resistant Fe–Mo–Al Alloys in H2/H2S Atmospheres at 900°C. Oxidation of Metals 54, 103–120 (2000). https://doi.org/10.1023/A:1004654713700

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