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Sulfide-forming features during oxidation of predeformed nickel in SO2

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Abstract

Loaded parts are exposed to hot corrosion to a greater extent than unloaded components. Pure nickel predeformed to various degrees by compression (up to 27%) has been oxidized in SO2 at 600°C for different periods (22 to 95 hr). It has been shown that transport properties of the scale, formed on the initial metal surface containing physical defects, depend on their surface density. A general behavior was established for the same exposure (>70 hr): the higher the preliminary strain, the greater the amount of Ni3S2 in the scale. Nickel predeformed 21% and 27%, oxidized in SO2 over 70 hr, formed scales consisting mainly of a single-phase Ni3S2 layer. An increase of the scale defectiveness accelerated attainment of heterogeneous equilibrium in a gas-scale system and intensified the formation of Ni3S2—the stable phase for the conditions used.

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Authors and Affiliations

  1. Department of Materials and Metallurgical Technology (NIOMET), Uralmash Company Inc., 6200012, Yekaterinburg, Russia

    A. K. Roslik

  2. Department of Solid State Physics, Urals University, 620083, Yekaterinburg, Russia

    V. N. Konev & A. M. Maltsev

Authors
  1. A. K. Roslik
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  2. V. N. Konev
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  3. A. M. Maltsev
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Roslik, A.K., Konev, V.N. & Maltsev, A.M. Sulfide-forming features during oxidation of predeformed nickel in SO2 . Oxid Met 43, 83–95 (1995). https://doi.org/10.1007/BF01046748

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  • DOI: https://doi.org/10.1007/BF01046748

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