Title :
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
fDate :
9/1/1997 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
