Process for producing a corrosion resistant permanent magnet

Details Process for producing a corrosion resistant permanent magnet Process for producing a corrosion resistant permanent magnet

1989-12-21

1990-11-06

Pianalto, Bernard

Coating processes

Magnetic base or coating

Magnetic coating

20419211, 20419231, 427127, 427130, 427132, 427250, 427295, 427328, 427377, 4273839, 427436, 427437, B05D 512

Patent

active

049685295

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.

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