Corrosion resistant permanent magnet

Details Corrosion resistant permanent magnet Corrosion resistant permanent magnet

1988-03-24

1990-07-17

Lechert, Jr., Stephen J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

428558, 428611, 428928, 148122, 148102, 148302, 148303, 148310, 148311, 252 6255, B22F 704

Patent

active

049420984

ABSTRACT:
To obtain an anticorrosive Fe-B-R type permanent magnet; in particular, to reduce deterioration rate of the initial magnetic properties below 10% after the magnet has been kept at 80.degree. C. in 90% relative humidity for 500 hours, the surface of the sintered permanent magnet is coated with metallic coating film layers of at least one noble metal layer and at least one base metal layer disposed on the noble metal layer. Diffusion heat treatment further improves the adhesiveness of the coating film layers.

REFERENCES:
patent: 3591428 (1968-11-01), Buschew et al.
Japanese Patent Kokai Publication No. 59-64733, Apr. 12, 1984.
Japanese Patent Kokai Publication No. 59-132104, Jul. 30, 1984.
Japanese Patent Kokai Publication No. 59-89401, May 23, 1984.
Japanese Patent Kokai Publication No. 59-46008, Mar. 15, 1984.
Japanese Patent Kokai Publication No. 60-34005, Feb. 21, 1985.
Japanese Patent Kokai Publication No. 60-54406, Mar. 28, 1985 (English abstract attached).

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