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Corrosion Resistance of GdTbDyHoSc and GdTbDyHoY High-Entropy Rare-Earth Alloys with Protective Coatings

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Inorganic Materials Aims and scope

Abstract—

We have studied for the first time the feasibility of using Al2O3 and Al : Zn (1 : 1) coatings produced by supersonic plasma spraying for protecting GdTbDyHoSc and GdTbDyHoY high-entropy rare-earth (RE) alloys from corrosion in a salt-fog chamber. The results demonstrate that, under salt fog conditions, Al2O3 coatings break down through local surface activation, resulting in pitting corrosion, with a considerable fraction of the coating on the main material remaining intact. The alloys coated with Al : Zn (1 : 1) exhibit lower corrosion resistance under salt fog conditions as a consequence of electrochemical corrosion. Interaction of Al2O3 with NaCl limits the suitability of such coatings for protecting high-entropy RE alloys under salt fog conditions. Limitations refer to the specimen test time and coating thickness.

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ACKNOWLEDGMENTS

In this study, we used equipment at the Ural-M Shared Research Facilities Center.

Funding

This work was supported by the Russian Science Foundation, grant no. 21-43-00015.

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Authors and Affiliations

  1. Institute of Metallurgy, Ural Branch, Russian Academy of Sciences, 620016, Yekaterinburg, Russia

    B. R. Gelchinski, E. V. Ignat’eva, S. A. Petrova, O. A. Korolev, A. V. Varaksin, I. S. Sipatov, N. I. Ilinykh & A. A. Rempel

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  1. B. R. Gelchinski
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  2. E. V. Ignat’eva
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  3. S. A. Petrova
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  4. O. A. Korolev
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  5. A. V. Varaksin
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  6. I. S. Sipatov
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  7. N. I. Ilinykh
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  8. A. A. Rempel
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Correspondence to N. I. Ilinykh or A. A. Rempel.

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Gelchinski, B.R., Ignat’eva, E.V., Petrova, S.A. et al. Corrosion Resistance of GdTbDyHoSc and GdTbDyHoY High-Entropy Rare-Earth Alloys with Protective Coatings. Inorg Mater 59, 720–728 (2023). https://doi.org/10.1134/S0020168523070051

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