Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Forming multiple superposed electrolytic coatings
Patent
1991-08-06
1994-09-20
Niebling, John
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Forming multiple superposed electrolytic coatings
205197, 205210, 205217, 427127, 427309, C25D 534
Patent
active
053486390
ABSTRACT:
A surface treatment for a R-TM-X type of permanent magnet comprising the steps: Etching the magnet with nitric acid having a concentration of 0.2 to 10 vol %, then etching the magnet with a mixture of oxygenated water having a hydrogen peroxide concentration of 0.2 to 10 vol % and acetic acid having a concentration of 10-30 vol %, and next plating the magnet with a copper plating initially followed by a nickel plating. R represents an element or a mixture of rare earth elements, TM is mainly composed of iron and transition elements other than iron and X represents one or more of a mixture of elements to enhance the coercivity of the magnet. This improvement of the magnet material itself improves the corrosion resistance of the protective film on the magnet surface.
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
Hitachi Magnetics Corporation
Leader William T.
Niebling John
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