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Hot Corrosion Behavior of a Cr-Modified Aluminide Coating on a Ni-Based Superalloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

A Cr-modified aluminide coating is prepared on a Ni-based superalloy using arc ion plating and subsequent pack cementation aluminizing. Hot corrosion behavior of the Cr-modified aluminide coating exposed to molten Na2SO4/K2SO4 (3:1) or Na2SO4/NaCl (3:1) salts at 900 °C in static air are evaluated as well as the aluminide coating. The results indicate that compared with the aluminide coating, the anti-corrosion properties of the Cr-modified aluminide coating in the both salts are improved, which should be attributed to the beneficial effect of the Cr in the coating. The corrosion mechanism of the Cr-modified aluminide coating, especially the role of Cr in the mixture salt corrosion, is discussed.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51001106) and National Basic Research Program of China (No. 2012CB625100).

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Authors and Affiliations

  1. State Key Laboratory of Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Duoli Wu, Sumeng Jiang, Qixiang Fan, Jun Gong & Chao Sun

Authors
  1. Duoli Wu
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  2. Sumeng Jiang
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  3. Qixiang Fan
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  4. Jun Gong
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  5. Chao Sun
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Corresponding author

Correspondence to Chao Sun.

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Wu, D., Jiang, S., Fan, Q. et al. Hot Corrosion Behavior of a Cr-Modified Aluminide Coating on a Ni-Based Superalloy. Acta Metall. Sin. (Engl. Lett.) 27, 627–634 (2014). https://doi.org/10.1007/s40195-014-0108-5

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  • DOI: https://doi.org/10.1007/s40195-014-0108-5

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