Magnetic and corrosion characteristics of Nd-Fe-B magnet with various surface coatings

Author

Cheng, C.W. ; Man, H.C. ; Cheng, F.T.

Author_Institution

Dept. of Appl. Phys., Hong Kong Polytech. Univ., Hung Hom, Hong Kong

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3910

Lastpage

3912

Abstract

Various surface coatings, including duplex Ni(undercoat)/Cr(topcoat), multilayer Ni/Cu/Ni/Cr, Zn, bright Ni, bright Au, and black epoxy were applied to improve the corrosion resistance of the Nd-Fe-B magnet. The corrosion behavior of the surface-coated magnets was studied using Normal and Acetic Acid Salt Spray Tests. The influence of coating and corrosion on the magnetic properties was also investigated. It was found that the duplex Ni/Cr coating provided the best corrosion protection with little deterioration in the magnetic properties during the corrosion process

Keywords

boron alloys; corrosion protective coatings; ferromagnetic materials; iron alloys; magnetic thin films; neodymium alloys; permanent magnets; Au; Nd-Fe-B; Nd-Fe-B magnet; Ni; Ni-Cu-Ni-Cr; Ni/Cr duplex coatings; Ni/Cu/Ni/Cr multilayer; Salt Spray Tests; Zn; black epoxy; corrosion resistance; magnetic properties; surface coatings; Chromium; Coatings; Corrosion; Gold; Magnetic multilayers; Magnetic properties; Spraying; Surface resistance; Testing; Zinc;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.619612

Filename

619612