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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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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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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DOI: https://doi.org/10.1007/s11665-023-09019-5