Substrate for magnetic disk

Details Substrate for magnetic disk Substrate for magnetic disk

1995-01-06

1995-11-14

Utech, Benjamin

Coating processes

Magnetic base or coating

Magnetic coating

427131, 427132, 427431, 427436, B05D 512

Patent

active

054664810

ABSTRACT:
A substrate for a magnetic disk having minute semi-spherical raised portions formed over the entire surface by a non-electrolytic plating process, an electrolytic plating process or plating nuclei containing palladium, gold, silver, or copper. The substrate is obtained by comprising steps of forming a Ni--P intermediate layer by Ni--P plating on an aluminum substrate, finishing the Ni--P intermediate layer, dipping the substrate in a plating solution to effect palladium plating to form a Pd plating layer and forming a Ni--P plating layer to form minute semi-spherical raised portions over an entire surface of the Pd plating layer.

REFERENCES:
patent: 3695854 (1972-10-01), Egger et al.
patent: 4072781 (1978-02-01), Shirahoto et al.
patent: 4539264 (1985-09-01), Yazawo et al.
patent: 5017337 (1991-05-01), Nabae et al.
patent: 5134038 (1992-07-01), Baseman et al.
patent: 5405646 (1995-04-01), Nanis

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