Rare earth based permanent magnet having corrosion-resistant sur

Details Rare earth based permanent magnet having corrosion-resistant sur Rare earth based permanent magnet having corrosion-resistant sur

1990-11-29

1992-01-21

Lechert, Jr., Stephen J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

419 27, 420127, B22F 300

Patent

active

050827456

ABSTRACT:
A highly corrosion-resistant rare earth-, e.g., neodymium-, based sintered permanent magnet is proposed which is characterized by the specific chemical composition of the magnet alloy including cobalt and/or chromium in a specified atomic percentage, by the density of the sintered body of at least 95% of the density of the alloy ingot and by the corrosion-resistant surface film formed on the surface of the sintered body by a specific method. By virtue of the favorable conditions against corrosion including the specific chemical composition of the magnet alloy and the high density of the sintered body, these conditions are also favorable for enhancing the adhesion of the corrosion-resistant coating film to the surface of the sintered body.

REFERENCES:
patent: 4931092 (1990-06-01), Cisar et al.

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