Journal of Materials Science

, Volume 41, Issue 17, pp 5735–5738 | Cite as

NdFeB magnetic powders surface modification by a fluid-bed electrodeposition

  • Jiawei ShengEmail author
  • Liqiang Jiang
  • Jingwu Zheng

Permanent magnets based on Nd2Fe14B compound are widely used in many applications, e.g. motors, electric and computer peripherals[1, 2, 3]. The main problems related with these and others applications are low temperature coefficients of remanence and coercivity as well as low corrosion resistance. The unacceptable corrosion behavior of NdFeB magnets derives from high Nd content and Nd-riched phase [1]. Two methods are commonly applied to improve the magnets corrosion resistance: (1) coating of the bulk magnet and (2) alloy modifications. NdFeB magnets surface coated with Zn, Sn, Al, Ni, Cr, or Cu have good corrosion resistance [1, 4, 5]. In general, chemical or electronic deposition was widely applied for magnetic powders metallic surface coating. The chemical deposition layer was relatively loose and the thickness cannot be controlled effectively; most of all, it cannot deposit those metals whose electrode potential was negative than NdFeB substrate [6]. The normally applied...


Compressive Strength Coercive Force Coated Sample Metallic Layer Magnetic Powder 


  1. 1.
    Jakubowicz J, (2001) J Alloys Comp 314:305CrossRefGoogle Scholar
  2. 2.
    Campbell P (1994) Permanent magnet materials and their application, Cambridge University PressGoogle Scholar
  3. 3.
    Furlani EP (2001) Permanent magnet and electromechanical devices: materials, analysis, and applications, Academic PressGoogle Scholar
  4. 4.
    Cheng CW, Man HC, Cheng FT (1997) IEEE Trans Magn 33:3910CrossRefGoogle Scholar
  5. 5.
    Tenaud P, Vial F, Sagawa M (1990) IEEE Trans Magn 26:1930CrossRefGoogle Scholar
  6. 6.
    Henry J (1995) Electroless (autocatalytic, chemical) plating, Metal finishing, 93:401CrossRefGoogle Scholar
  7. 7.
    Lin M (2004) M.S. Thesis, Zhejiang University of Technology, Hangzhuo, ChinaGoogle Scholar
  8. 8.
    Li H (2004) M.S. Thesis, Zhejiang University of Technology, Hangzhuo, ChinaGoogle Scholar
  9. 9.
    Higuchi M, Tsuchida M, Osawa Z (1992) J Mater Sci 27:5795CrossRefGoogle Scholar
  10. 10.
    Osawa Z, Higuchi M (1992) J Mater Sci 27:5445CrossRefGoogle Scholar
  11. 11.
    Zhang YL (1997) J Magn Magn Mater 171:305CrossRefGoogle Scholar
  12. 12.
    Milazzo G, Caroli S (1978) Tables of standard electrode potentials, John Wiley and Sons, New YorkCrossRefGoogle Scholar
  13. 13.
    Kneller EF, Hawig R (1991) IEEE Trans Magn 27:3588CrossRefGoogle Scholar
  14. 14.
    Coehoorn R, de Mooij DB, de Warrd C (1989) J Magn Magn Mater 80:101CrossRefGoogle Scholar
  15. 15.
    Huang CY, Mo WW, Roan ML (2004) Surf Coat Technol 184:163CrossRefGoogle Scholar
  16. 16.
    Su YY, Shemenski RM (2000) Appl Surf Sci 161(7):355CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  1. 1.Department of Chemical and Materials EngineeringZhejiang University of TechnologyHangzhouChina

Personalised recommendations