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Simultaneous sulfidation-oxidation of nickel at 603°c in argon-so2 atmospheres

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Abstract

The simultaneous oxidation-sulfidation rate of nickel has been measured as a function of SO2 pressure (0.04 to 1 atm) in Ar-SO2 gas mixtures at 603°C. The observed corrosion rates are about 107 times faster than the oxidation rate of nickel in oxygen at 1 atm. The product scale consists of an inner Ni3S2 layer and an outer two-phase layer of NiO and Ni3S2. A linear rate law is observed during an initial time period, and the most probable rate-controlling step is dissociation of SO2. An increase in the scale-gas interfacial area increases the corrosion rate during intermediate time periods. With increasing time, parabolic corrosion rates are measured for SO2 pressures of 0.25 and 1 atm. Values of the nickel diffusivity in Ni3S2 calculated from our measured parabolic-rate constants are in good agreement with recently reported values. This agreement indicates that an interconnected Ni3S2 phase in the outer two-phase layer provides rapid transport paths for nickel diffusion through the scale.

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Authors and Affiliations

  1. Corporate Research and Development, General Electric Co., 12301, Schenectady, NY

    K. L. Luthra

  2. University of Pennsylvania, 19104, Philadelphia, PA

    W. L. Worrell (Professor of Metallurgy and Materials Science)

Authors
  1. K. L. Luthra
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  2. W. L. Worrell
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Formerly a Graduate Student in the Department of Metallurgy and Materials Science at the University of Pennsylvania, Philadelphia, PA

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Luthra, K.L., Worrell, W.L. Simultaneous sulfidation-oxidation of nickel at 603°c in argon-so2 atmospheres. Metall Trans A 9, 1055–1061 (1978). https://doi.org/10.1007/BF02652209

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  • DOI: https://doi.org/10.1007/BF02652209

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