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Hot Corrosion Behavior of Low-Pressure Cold-Sprayed CoNiCrAlY Coatings

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Abstract

CoNiCrAlY coatings were deposited by low-pressure cold spraying and pre-oxidized in a vacuum environment, and its hot corrosion behavior in pure Na2SO4 and 75 wt.% Na2SO4 + 25 wt.% NaCl salts was investigated. The pre-oxidation treatment resulted in the formation of a dense and continuous α-Al2O3 scale on the coating surface. After being corroded for 150 h at 900 °C, the pre-oxidized coating exhibited better corrosion resistance to both salts than the as-sprayed coating. The presence of preformed Al2O3 scale reduced the consumption rate of aluminum, by delaying the formation of internal oxides and sulfides and promoting the formation of a denser and more adherent Al2O3 scale. Moreover, we investigated the corrosion mechanism of cold-sprayed CoNiCrAlY coatings in the two salts and discussed the effect of the pre-oxidation treatment.

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Acknowledgments

This research was financially supported by foreign scientific and technological cooperation project of Jiangxi province (20151BDH80002) and International S&T Cooperation Program of China (2013DFR50900).

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Authors and Affiliations

  1. Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials, Jiangxi Academy of Sciences, Nanchang, 330029, China

    L. W. Zhang & L. Lu

  2. National Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing Institute of Technology, Beijing, 100081, China

    X. J. Ning, Q. S. Wang & L. Wang

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  1. L. W. Zhang
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  4. Q. S. Wang
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Correspondence to X. J. Ning.

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Zhang, L.W., Ning, X.J., Lu, L. et al. Hot Corrosion Behavior of Low-Pressure Cold-Sprayed CoNiCrAlY Coatings. J Therm Spray Tech 25, 587–594 (2016). https://doi.org/10.1007/s11666-016-0381-0

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  • DOI: https://doi.org/10.1007/s11666-016-0381-0

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