Method for producing a corrosion resistant rare earth-containing

Details Method for producing a corrosion resistant rare earth-containing Method for producing a corrosion resistant rare earth-containing

1989-05-31

1991-05-07

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

148102, 148103, 204 321, 204 42, C25D 534

Patent

active

050134116

ABSTRACT:
Corrosion-resistant rare earth magnets and a method for their manufacture, said magnets containing at least one rare earth element in an amount of 5 to 40 weight %, Fe in an amount of 50 to 90 weight %, Co in an amount of 0 to 15 wt %, B in an amount of 0.2 to 8 weight %, and at least one additive selected from Ni, Nb, Al, Ti, Zr, Cr, V, Mn, Mo, Si, Sn, Ga, Cu, and Zn in an amount of 0 to 8 weight %. The method comprises the steps of: (i) pretreating the surfaces of the magnet after sintering it; (ii) activating the surfaces thereof; and (iii) coating the surfaces thereof with at least one layer of Ni-containing film by electroplating. The activating may be carried out by treating the surfaces with a soap or a surface active agent. The activated surfaces may be subjected to ultrasonic vibrations in water to remove foreign substances before electroplating.

REFERENCES:
patent: 4837114 (1989-06-01), Hamada et al.
F. A. Lowenheim, Electroplating, McGraw-Hill Book Co., New York, 1978, pp. 67-92, 211-225.

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