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Corrosion of Fe-(4.8, 9.2, 14.3) Wt%Al alloys at 700 and 800 °C in N2/H2O/H2S gases

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Abstract

Fe-(4.8, 9.2, 14.3)wt%Al alloys were corroded at 700 and 800 °C for up to 70 h in 1 atm of N2/H2O and N2/H2O/H2S gases. Oxidation prevailed in N2/H2O gases. Fe-(4.8, 9.2)Al alloys formed a duplex scale that consisted of an outer iron oxide layer and an inner (Fe, Al, O)-mixed layer. The Fe-14.3Al alloy formed a thin layer consisting of α-Al2O3. Sulfidation dominated in N2/H2O/H2S gases, resulting in rapid corrosion. Fe-(4.8, 9.2)Al alloys formed a duplex scale that consisted of an outer FeS layer and an inner (Fe, Al, S, O)-mixed layer. The high growth rate of FeS impeded the formation of a continuous, protective aluminium-rich oxide. The Fe-14.3Al alloy formed a thin layer consisting of α-Al2O3 that was incorporated with a bit of sulfur.

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Authors and Affiliations

  1. Institute for Advanced Engineering, Plant Engineering Center, Suwon, 443-721, Korea

    Min Jung Kim

  2. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 440-746, Korea

    Dong Bok Lee

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  1. Min Jung Kim
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  2. Dong Bok Lee
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Correspondence to Dong Bok Lee.

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Kim, M.J., Lee, D.B. Corrosion of Fe-(4.8, 9.2, 14.3) Wt%Al alloys at 700 and 800 °C in N2/H2O/H2S gases. Met. Mater. Int. 19, 975–982 (2013). https://doi.org/10.1007/s12540-013-5009-z

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  • DOI: https://doi.org/10.1007/s12540-013-5009-z

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