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

1991-11-05

1994-02-15

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Forming multiple superposed electrolytic coatings

205181, 205197, 205210, 205217, 427127, C25D 510, C25D 534

Patent

active

052863662

ABSTRACT:
A magnetically anisotropic magnet substrate is coated with a triple layer of nickel plating preferably followed by a chromate layer. The layer of nickel plating includes an inner layer of a non-bright nickel plating, followed by an intermediate nickel-strike layer, followed by an outer layer of a semi-bright nickel plating. The inner layer contains much less sulfur than the other two layers, whereby the resulting difference in electromotive force provides a localized battery that permits the outer layers to be sacrificed without permitting the inner layer to be destroyed. One embodiment adds a copper under-layer below the nickel plating.

REFERENCES:
patent: 3090733 (1963-05-01), Brown
patent: 4100038 (1978-07-01), Jongkind
patent: 4384929 (1983-05-01), Tremmel et al.
patent: 5013411 (1991-05-01), Minowa et al.
patent: 5082745 (1992-01-01), Ohashi

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