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Studies on the hot corrosion of a nickel-base superalloy, Udimet 700

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Abstract

The hot corrosion of a nickel-base superalloy, Udimet 700, has been studied in the temperature range 900–950°C. The effect of the amount of Na 2SO4 on the corrosion kinetics was determined. Large weight gains and severe corrosion were associated with two different modes of degradation: (1) formation of large, interconnected sulfides beneath the external scale, and (2) formation of a Na2MoO4-MoO3 melt. The corrosion due to formation of the Na2MoO4-MoO3 melt occurred for all the salt-coating thicknesses, whereas, large sulfides were formed only for the heavier coatings of Na2SO4. The formation of Na2MoO4-MoO3 melt required an induction period, and the length of the induction period was observed to be a function of the amount of Na2SO4 and of temperature.

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References

  1. 1.

    N. S. Bornstein and M. A. DeCrescente,Metall. Trans. 2, 2875 (1971).

  2. 2.

    J. A. Goebel and F. S. Pettit,Metall. Trans,1, 1943 (1970).

  3. 3.

    J. A. Goebel, F. S. Pettit, and G. W. Goward,Metall. Trans. 4, 261 (1973).

  4. 4.

    G. C. Fryburg, F. J. Kohl, C. A. Stearns, and W. L. Fielder,J. Electrochem. Soc. 129, 571 (1982).

  5. 5.

    E. L. Simons, G. V. Browning, and H. Liebhafsky,Corr. 11, 17 (1955).

  6. 6.

    J. Stringer,Proceedings of the Gas Turbine Materials in the Marine Environment, J. W. Fairbanks and I. Machlin, eds. (MCIC-75-27, 1975), pp. 161.

  7. 7.

    A. K. Misra, submitted for publication in theJ. Electrochem. Soc.

  8. 8.

    R. A. Rapp and K. S. Goto,Proceedings of the Second International Symposium on Molten Salts, J. Braunstein and J. R. Selman, eds. (Electrochemical Society, Pennington, N.J., 1981), p. 159.

  9. 9.

    D. A. Shores,High Temperature Corrosion (National Association of Corrosion Engineers, Houston, 1983), p. 493.

  10. 10.

    D. W. McKee and G. Romeo,Metall. Trans. A6, 101 (1975).

  11. 11.

    C. J. Spengler and R. Viswanathan,Metall. Trans. 3, 161 (1972).

  12. 12.

    J. A. Goebel and F. S. Pettit,Metall. Trans. 1, 3421 (1970).

  13. 13.

    M. E. El-Dahshan, D. P. Whittle, and J. Stringer,Oxid. Met. 8, 179 (1974).

  14. 14.

    Y. Bourhis and C. Saint-John,Proceedings of the Symposium on Properties of High Temperature Alloys, Z. A. Foroulis and F. S. Pettit, eds. (Electrochemical Society, Pennington, N.J., 1977), p. 595.

  15. 15.

    C. E. Lowell and D. L. Deadmore,Proceedings of the Symposium on Corrosion in Fossil Fuel Systems, I. G. Wright, ed. (Electrochemical Society, Pennington, N.J., 1983), p. 365.

  16. 16.

    G. J. Santoro,Oxid. Met. 13, 405 (1979).

  17. 17.

    R. C. Weast and M. J. Astle, eds.,Handbook of Chemistry and Physics (CRC Press, Boca Raton, Fla., 1978–1979).

  18. 18.

    C. S. Giggins and F. S. Pettit,Oxid. Met. 14, 363 (1980).

  19. 19.

    E. Erdos, H. Altorfer, and E. Denzler,Werkst. Korros. 33, 373 (1982).

  20. 20.

    W. C. Fang and R. A. Rapp,J. Electrochem. Soc. 130, 2335 (1983).

  21. 21.

    S. Floreen and R. H. Kane,Metall. Trans. A10, 1745 (1979).

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Work funded under NASA Grant NCC 3-43.

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Misra, A.K. Studies on the hot corrosion of a nickel-base superalloy, Udimet 700. Oxid Met 25, 129–161 (1986). https://doi.org/10.1007/BF00655894

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Key words

  • nickel-base superalloy
  • hot corrosion
  • sodium sulfate