Surface treatment for iron-based permanent magnet including rare

Details Surface treatment for iron-based permanent magnet including rare Surface treatment for iron-based permanent magnet including rare

1993-03-01

1994-07-26

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Forming multiple superposed electrolytic coatings

205182, 205170, 148265, C25D 500

Patent

active

053324889

ABSTRACT:
A magnetically anisotropic magnet substrate is coated with at least one layer of nickel plating followed by a chromate layer. The chromate top layer improves the corrosion resistance of the coated magnet substrate. In a preferred embodiment, the layer of nickel plating includes a first layer of a non-bright nickel plating followed by a second layer of a semi-bright nickel plating. One embodiment adds a copper under-layer below the nickel plating.

REFERENCES:
patent: 4328046 (1982-05-01), Fuchs
patent: 5013411 (1991-05-01), Minowa et al.

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