Protection and bonding of neodymium-boron-iron magnets used in t

Details Protection and bonding of neodymium-boron-iron magnets used in t Protection and bonding of neodymium-boron-iron magnets used in t

1989-01-11

1990-06-19

Gallagher, John J.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

29596, 156153, 156280, 156281, 156319, 156330, 310154, 310272, 335302, 335303, 427127, B32B 3100

Patent

active

049350803

ABSTRACT:
A method of preparing corrosion resistant neodymium-boron-iron magnets is provided. The cleaned magnet is coated with zinc phosphate which neutralizes surface effects of contaminants and rinsed with chromic acid. A relatively large surface area having numerous mechanical interlocking sites receptive to adhesives and coatings is obtained. In one embodiment a durable, corrosion-resistant coating such as amide imide or specially formulated zinc-or chromium-rich epoxy primer is applied to the zinc phosphate coated magnet. This can be bonded to a substrate using a suitable adhesive. A flexible epoxy adhesive is used for bonding motor field assemblies.

REFERENCES:
patent: 2774701 (1956-12-01), Koryta
patent: 4141137 (1979-02-01), De Wolf et al.
patent: 4464595 (1984-08-01), Hamano et al.
patent: 4748738 (1988-06-01), Nayar

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