Abstract
Hot-corrosion attack on gas-turbine components has been a problem of practical importance for over two decades. The nature and the extent of corrosion are influenced by the type of contaminants, the alloy constituents, and temperature. The hot-corrosion process is quite complex. There is controversy regarding the role of alloying elements, and whether the process is chemical or electrochemical in nature. In this investigation, an attempt has been made to investigate the role of Al and Ti in influencing the hot-corrosion attack of Ni-20 wt. % Cr alloys in molten Na2SO4-NaCl mixtures. It was found that Ni-Cr-Al alloys undergo a localized, heavy-blister attack under certain experimental conditions which is electrochemical in nature. An electrochemical model has been proposed which can satisfatorily explain the nature and kinetics of the localized blister corrosion.
Similar content being viewed by others
References
J. Stringer, Hot corrosion in gas turbines, MCIC 72-08 (Metals and Ceramics Information Center, Columbus, Ohio, 1972).
R. L. Jones and J. W. Fairbanks, in Proceedings of the 1974 Gas Turbine Materials in the Marine Environment Conference, J. W. Fairbanks and Irving Machlin, eds., MCIC 75-27 (Columbus, Ohio, 1975), p. 219.
P. Hancock, in Ref. 2, p. 225.
J. F. G. Conde, High Temperature Corrosion of Aerospace Alloys, J. Stringer, R. I. Jaffee, and T. F. Kearns, eds., AGARD-CP-120 (NTIS, Springfield, Va., 1973), p. 204.
P. Hancock,Proceedings of the Symposium on High Temperature Metal Halide Chemistry, D. L. Hildenbrand and D. D. Cubicciotti, eds. (Electrochemical Society, Princeton, N.J., 1978), p. 645.
N. S. Bornstein, M. A. DeCrescente, and H. A. Roth,Deposition and Corrosion in Gas Turbines, A. B. Hart and A. J. B. Cutler, eds. (Applied Science Publishers, London, 1973), p. 70.
J. A. Goebel, F. S. Pettit, and G. W. Goward, in Ref. 6, p. 96.
J. Stringer and M. El Dahshan, in Ref. 2, p. 171.
D. Shores, in Ref. 2, p. 555.
A. J. B. Cutler and C. J. Grant, in Ref. 6, p. 178.
W. C. Fang and R. A. Rapp,Electrochem. Soc. 130(12), 2335 (1983).
J. F. G. Conde and B. A. Wareham, in Ref. 2, p. 73.
J. Stringer,Corrosion Problems in Energy Conversion and Generation, C. S. Tedmon, ed. (Electrochemical Society, Princeton, N.J., 1974), p. 79.
G. J. Danek, State of the art survey on hot corrosion in marine gas turbines, U.S. Navy Marine Engineering Lab., R & D Report 32/65 (NTIS, Springfield, Va., 1965).
E. G. Richards and P. L. Twigg, Development of high chromium superalloys resistant to hot corrosion, Report P-BL 106, International Nickel Ltd., London (1970).
M. K. Hossain and S. R. J. Saunders,Oxid. Met. 12(1), (1978).
C. A. Stearns, F. J. Kohl, and G. C. Fryburg, in Ref. 5, p. 655.
A. U. Seybolt,Oxid. Met. 2, 119 (1970).
C. S. Giggins and F. S. Pettit,Met. Trans. 2, 1071 (1971).
L. L. Shrier, ed.,Corrosion, Vol. 1, (Newnes Butterworths, London, 1979), p. 1, 135.
R. Littlewood and E. J. Argent,Electrochim. Acta 4, 114 (1961).
C. Wagner,Werkstoffe Korr. 25(3), 161 (1974).
R. E. Anderson,J. Electrochem. Soc. 1, 26, 325 (1979).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sivakumar, R., Sagar, P.K. & Bhatia, M.L. On the electrochemical nature of hot-corrosion attack in Ni-Cr alloys. Oxid Met 24, 315–330 (1985). https://doi.org/10.1007/BF00657063
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00657063