Process for preparing magnetic disk

Details Process for preparing magnetic disk Process for preparing magnetic disk

1991-07-25

1993-05-11

Zimmerman, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Coating predominantly nonmetal substrate

427129, 205223, C25D 1120, B05D 502, B05D 508

Patent

active

052098370

ABSTRACT:
This invention relates to a process for preparing a magnetic disk, which comprises (a) subjecting a substrate having an anodized aluminum film to mirror surface-finishing, (b) widening pores of the anodized aluminum film by chemical dissolution treatment so that the total area of pores becomes from 20 to 80% of the entire surface area, thereby retaining crystalline alumina of the anodized aluminum film extruded after the chemical dissolution treatment, and (c) coating the resultant substrate with a magnetic continuous thin film.

REFERENCES:
patent: 4631112 (1986-12-01), Usui et al.
patent: 4650708 (1987-03-01), Takahashi
patent: 4659606 (1987-04-01), Wada et al.
patent: 4761330 (1988-08-01), Tokoshima et al.

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