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Hot Corrosion Behavior of Si–Y–Co-Modified Aluminide Coating Exposed to NaCl + Na2SO4 Salt at 1173 K

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Abstract

The microstructure and hot corrosion behavior of a Si–Y–Co-modified aluminide coating prepared on a nickel base superalloy DZ125 by the pack cementation process was studied. The Co–Al–Si–Y coated specimen had a mass gain of only 0.25 mg/cm2 after being exposed to NaCl + Na2SO4 salt for 100 h at 1173 K. Thus the addition of Si to a Y–Co-modified aluminide coating increased its hot corrosion resistance by 40 %. The improved hot corrosion resistance of the Co–Al–Si–Y coating was mainly attributed to the formation of an Al2O3 scale with SiO2 on the surface of the coating during the hot corrosion test. SiO2 can prohibit the high fluxing rate of dissolution of the protective Al2O3 scale and prevent rapid corrosion attack owing to its low solubility over a wide range of salt acidity and its weak oxygen permeability.

Graphical Abstract

The Co–Al–Si–Y coated specimen had a mass gain of only 0.25 mg/cm2 after being exposed to NaCl + Na2SO4 salt for 100 h at 1173 K. The addition of Si to a Y–Co-modified aluminide coating improved its hot corrosion resistance.

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Acknowledgments

This project is supported by the National Natural Science Foundation of China under Contract 51371021 and the Aviation Science Foundation under Contract 2014ZE51053.

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Authors and Affiliations

  1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100191, China

    Zongjie Liu & Chungen Zhou

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  1. Zongjie Liu
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  2. Chungen Zhou
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Correspondence to Chungen Zhou.

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Liu, Z., Zhou, C. Hot Corrosion Behavior of Si–Y–Co-Modified Aluminide Coating Exposed to NaCl + Na2SO4 Salt at 1173 K. Oxid Met 85, 205–217 (2016). https://doi.org/10.1007/s11085-015-9599-3

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  • DOI: https://doi.org/10.1007/s11085-015-9599-3

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