Process for preparing magnetic disk

Details Process for preparing magnetic disk Process for preparing magnetic disk

1990-02-23

1991-12-24

Zimmerman, John J.

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Coating predominantly nonmetal substrate

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

Patent

active

050749714

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: 4650708 (1987-03-01), Takahashi
patent: 4659606 (1987-04-01), Wada et al.
patent: 4761330 (1988-08-01), Tokoshima et al.
Patent Abstracts of Japan, vol. 9, No. 76 (P-346) (1799), 5 Apr. 1985 and JP-A-59 207 209 (Nippon Gakki Seizo K.K.).
Patent Abstracts of Japan, vol. 10, No. 198 (P-476) (2254) 11 Jul. 1986 and JP-A-61 42 721 (Toshiro Takashi).

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