Development of Chromium and Aluminum Coatings on Superalloys by Pack-Cementation Technique

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Austenitic nickel-iron-chromium based superalloys are materials of choice for high temperature applications as they provide high temperature creep resistance associated with a suitable oxidation behavior in the temperature range of 600-1100°C. However, these properties are not sufficient for applications as Steam Methane Reformer (SMR). As a consequence, aluminum and chromium coatings are developed by the pack-cementation technique to improve their corrosion resistance. The oxidation behavior of the coated samples has been carried out in air at 1050°C. Chromium deposition leads to a layer of bcc chromium-iron solid solution. Oxidation tests indicated that a too high chromium concentration induces a too rapid growth of the chromia layer. In the case of aluminum coatings, a layer of -NiAl is formed at the surface of the alloy. It permits a significant decrease of the oxidation rate.

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Edited by:

M. Heilmaier

Pages:

491-496

Citation:

X. Ledoux et al., "Development of Chromium and Aluminum Coatings on Superalloys by Pack-Cementation Technique", Advanced Materials Research, Vol. 278, pp. 491-496, 2011

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July 2011

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[1] J.E. Croll and G.R. Wallwork, Oxid. Met., 4, 121 (1972).

[2] H. Hindam and D. P. Whittle, Oxid. Met., 18, 245 (1982).

[3] P. Kofstad, in High temperature corrosion, Elsevier Applied Science (1988).

[4] L. Royer, X. Ledoux, S. Mathieu, P. Steinmetz, On the oxidation and nitridation of chromium at 1300°C, Oxid. Met., in press (2010).

DOI: https://doi.org/10.1007/s11085-010-9198-2

[5] G. C. Rybicki and J. L. Smialek, Oxid. Met., 31, 275 (1989).

[6] B.A. Pint, I.G. Wright, W.Y. Lee, Y. Zhang, K. Prussner, K.B. Alexander Substrate and bond coat compositions: factors affecting alumina scale adhesion, Mat. Sci. and Eng. A. Vol. 245, 201-211 (1998).

DOI: https://doi.org/10.1016/s0921-5093(97)00851-4

[7] R.P. Blum, D. Ahlbehrendt, H. Niehus Growth of Al2O3 stipes on NiAl (001), Surf. Sci., Vol. 396 176-188 (1998).

DOI: https://doi.org/10.1016/s0039-6028(97)00667-5

[8] M. W. Brumm, H. J. Grabke, Corros. Sci., 33, 1677 (1992).

[9] P. Lamesle, M. Vilasi, J.M. Claude, P. Steinmetz Effect of Palladium and chromium additions on the oxidation behaviour of b-NiAl alloys, Les Embiez (1996).

DOI: https://doi.org/10.4028/www.scientific.net/msf.251-254.171