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Sulfidation behavior of Fe-25Cr-20Ni-1.5Al2O3 in simulated coal combustion/gasification environments

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Abstract

The effect of minor addition of α-Al2O3 dispersoids on the sulfidation behavior of Fe-25Cr-20Ni was investigated over a range of pO2, 1.13×10−20 to 1.18×10 ****−22 atm. at constant pS2=1.22×10−8 atm. Fe-25Cr-20Ni and Fe-25Cr-20Ni 1.5 Al2O3 with and without preformed oxide scales were exposed to bioxidant gas mixtures H2/H2O/H2S/Ar at 700° C. Both isothermal and cyclic exposures were included. Scales were characterized by a combination of several surface analytical tools. A remarkable improvement in sulfidation resistance is observed in Fe-25Cr-20Ni-1.5Al2O3 under the conditions investigated here. This is attributed to the ability of the alloy to form and maintain a predominantly Cr2O3 scale with reduced Fe-diffusion and content. Possible scientific reasons for such improvement are discussed. The base alloy, Fe-25Cr-20Ni, fails to develop and retain such a Cr2O3 scale and undergoes sulfidation within a few minutes of exposure. The scale breakdown process by sulfidation is explained qualitatively. Experimental evidence suggests that sulfur in the environment enhances Fe-diffusion and content in the scale.

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Authors and Affiliations

  1. UES, Inc., 4401 Dayton-Xenia Road, 45432, Dayton, Ohio

    V. Srinivasan

  2. Metals and Ceramics Division (HTML), Oak Ridge National Laboratory, 37831, Oak Ridge, Tennessee

    L. A. Harris & R. A. Padgett Jr.

  3. Battelle Northwest Laboratories, 99352, Richland, Washington

    D. R. Baer

Authors
  1. V. Srinivasan
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  2. L. A. Harris
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  3. R. A. Padgett Jr.
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  4. D. R. Baer
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Srinivasan, V., Harris, L.A., Padgett, R.A. et al. Sulfidation behavior of Fe-25Cr-20Ni-1.5Al2O3 in simulated coal combustion/gasification environments. Oxid Met 36, 195–219 (1991). https://doi.org/10.1007/BF00662962

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  • DOI: https://doi.org/10.1007/BF00662962

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