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Preparation and Anticorrosion Performance of Double-Layer Epoxy Resin Coatings on Bonded NdFeB Magnets

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Abstract

Double-layer epoxy resin coatings (C-EP) were prepared on the surface of ring-shaped bonded NdFeB (RSM) by cathodic electrophoretic deposition and air spraying for the first time. The surface morphology and chemical composition of C-EP were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and atomic force microscopy (AFM). The digital microhardness tester was utilized to measure the microhardness of C-EP/RSM, which was found to be 33.623 HV, slightly higher than that of electrophoretic EP/RSM (E-EP/RSM). The corrosion-resistant performance of C-EP/RSM was evaluated through polarization curves and neutral salt spray (NSS) tests, with a discussion on the corrosion mechanism. The results indicate that the epoxy resin particles effectively penetrate into the pores of NdFeB matrix, exhibiting excellent sealing properties. The structure of C-EP is stable, and these two layers together contribute to better anti-corrosion performance. Compared to bare RSM (B-RSM) and E-EP/RSM, the corrosion current density is reduced by approximately one order of magnitude in C-EP/RSM. And, the NSS time of C-EP/RSM reaches 216 h, which is 1.5 times higher than that of E-EP/RSM, indicating superior corrosion resistance. Furthermore, C-EP has little effect on the magnetic properties of RSM.

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Acknowledgments

This study was financially supported by the Fundamental Research Funds for the Central Universities of China (Grant No. PA2022GDGP0029) and the Key Research and Development Program of Anhui Province (202104A05020001).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, Anhui Province, People’s Republic of China

    Youwen Yang, Yingzhong Sun, Lei Yang, Lushui Su, Mengke Jia, Xiaogang Fang & Jiguang Liu

  2. Engineering Research Center of High-Performance Copper Alloy Material and Forming, Ministry of Education, Hefei University of Technology, Hefei, 230009, Anhui Province, People’s Republic of China

    Youwen Yang, Xiaogang Fang & Jiguang Liu

  3. Magnequench Magnetic Materials (Chuzhou) Co., Ltd, Chuzhou, 239000, People’s Republic of China

    Yufan Chen

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  1. Youwen Yang
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Yang, Y., Sun, Y., Yang, L. et al. Preparation and Anticorrosion Performance of Double-Layer Epoxy Resin Coatings on Bonded NdFeB Magnets. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-09019-5

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