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Corrosion Behavior of Sintered NdFeB Magnets Coated with Ni Coatings Deposited by Ion Beam Sputtering

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Abstract

To improve the corrosion resistance of a sintered NdFeB magnet, pure Ni coatings were deposited on the magnet by ion beam sputtering, and the effect of the deposition process parameters upon the microstructure and the corrosion resistance of the Ni coating was investigated by scanning electron microscopy and potentiodynamic polarization curves, respectively. A dense Ni coating was obtained via room temperature deposition for 3 h, which exhibited high adhesive strength with the NdFeB substrate and excellent corrosion resistance. The Ni coatings deposited at high temperature, however, possessed a lower corrosion resistance that can be attributed to the atom diffusion and crystallization of the coatings grown at high temperature. A magnetic field is found to affect the corrosion behavior of NdFeB magnets with or without Ni coatings, reducing its corrosion resistance. The corrosion resistance of a Ni-coated NdFeB sample in the presence of a magnetic field is better than that of an uncoated sample.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 51571087) and the Key Project for Science and Technology of Changsha (K1306063-11).

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China

    Sheng-qing Hu, Kun Peng & Hong Chen

  2. College of Materials Science and Engineering, Hunan University, Changsha, 410082, China

    Kun Peng & E. Chen

Authors
  1. Sheng-qing Hu
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  2. Kun Peng
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  3. E. Chen
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  4. Hong Chen
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Correspondence to Sheng-qing Hu or Kun Peng.

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Hu, Sq., Peng, K., Chen, E. et al. Corrosion Behavior of Sintered NdFeB Magnets Coated with Ni Coatings Deposited by Ion Beam Sputtering. J. of Materi Eng and Perform 24, 4985–4990 (2015). https://doi.org/10.1007/s11665-015-1787-4

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  • DOI: https://doi.org/10.1007/s11665-015-1787-4

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