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Hot-Corrosion Resistance of Ni–Cr–Al–Y and Ni–18% Si Alloys in Sulfate Eutectic and Sulfate Plus Vanadate Melts at 973 K

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Abstract

The hot-corrosion resistance of Ni–Cr–Al–Y and Ni–17.8 wt.% Si was examined in sulfate and sulfate plus vanadate melts at 973 K. Two salt-deposit compositions were considered: (a) sodium sulfate+50 mole% magnesium-sulfate eutectic and (b) sodium sulfate plus 20 mole% sodium meta-vanadate. Both types of deposit were molten at the test temperature. Cyclic hot-corrosion tests were conducted in a gas mixture consisting of oxygen, sulfur dioxide, and 0.0240 vol.% sulfur trioxide. The hot-corrosion kinetics were evaluated using weight change and the corrosion mechanism deduced from post-test metallography. The results indicate that the nickel–silicon alloy had much better hot corrosion resistance than Ni–Cr–Al–Y under all test conditions considered. The sample preparation process is outlined, the test procedure summarized, and the experimental results are presented and discussed.

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Authors and Affiliations

  1. Thermatech Satellite Laboratory, Howmet Research Corporation, 555 Benston Road, Whitehall, Michigan, 49461

    Bruce M. Warnes

  2. Materials Science and Engineering Department, The University of Pittsburgh, 848 Benedum Engineering Hall, Pittsburgh, Pennsylvania, 15261

    Fred S. Pettit & Gerald H. Meier

Authors
  1. Bruce M. Warnes
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  2. Fred S. Pettit
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  3. Gerald H. Meier
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Warnes, B.M., Pettit, F.S. & Meier, G.H. Hot-Corrosion Resistance of Ni–Cr–Al–Y and Ni–18% Si Alloys in Sulfate Eutectic and Sulfate Plus Vanadate Melts at 973 K. Oxidation of Metals 58, 487–498 (2002). https://doi.org/10.1023/A:1020521022148

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  • DOI: https://doi.org/10.1023/A:1020521022148

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