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Hot corrosion of surface-modified Sm2Co17 high-temperature magnet with Ni and Ni/Cr bilayer coatings in 75 wt% Na2SO4–NaCl mixture

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Abstract

Hot corrosion behavior of Sm2(Co, Fe, Cu, Zr)17-type high-temperature magnetic alloy without and with a protective coating of Ni and Ni/Cr bilayer at 500 °C in a corrosive mixture of 75 wt% Na2SO4–NaCl for 100 h was reported in this paper. The obtained results of time-dependent weight change established the parabolic growth of oxidized surface of bare magnets (8.87 mg·cm−2), which caused a rapid loss of magnetic properties measured both at room and high temperatures (500 °C). X-ray diffraction (XRD) analysis revealed the growth of oxides for bare magnet and Cr–oxides (Cr2O3), top layer of Ni/Cr bilayer coating, but in the case of single coating, Ni–sulfides formation indicated penetration of sulfur, which is further verified by electron probe microanalysis with energy dispersive spectroscopy (EPMA/EDS) study. Results showed that bilayer-coated samples (Ni/Cr) performed better than Ni-coated and bare samples.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51761145026 and 51471016) and the Natural Science Foundation of Beijing (No. 2151002).

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Authors and Affiliations

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

    Saira Bibi, Jing-Min Wang & Cheng-Bao Jiang

  2. School of Space and Environment, Beihang University, Beijing, 100191, China

    Tariq Mehmood

  3. Institute of Advanced Materials, Bahauddin Zakariya University, Multan, 60800, Pakistan

    Saira Bibi & Waheed Qamar Khan

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  1. Saira Bibi
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  2. Jing-Min Wang
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  3. Tariq Mehmood
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  5. Cheng-Bao Jiang
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Correspondence to Saira Bibi.

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Bibi, S., Wang, JM., Mehmood, T. et al. Hot corrosion of surface-modified Sm2Co17 high-temperature magnet with Ni and Ni/Cr bilayer coatings in 75 wt% Na2SO4–NaCl mixture. Rare Met. 40, 2494–2500 (2021). https://doi.org/10.1007/s12598-020-01604-0

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  • DOI: https://doi.org/10.1007/s12598-020-01604-0

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