Process for fabricating a multi-layer magnetic thin film disk

Details Process for fabricating a multi-layer magnetic thin film disk Process for fabricating a multi-layer magnetic thin film disk

1981-03-30

1982-10-26

Chemistry: electrical and wave energy

Processes and products

204 38E, 427129, 427131, 428 64, 428693, 428900, G11B 566, G11B 584, C25D 1104

Patent

active

043560660

ABSTRACT:
Multi-layer magnetic thin film disks comprising a synthetic resin layer on an aluminum-containing substrate and an overlying metallic magnetic layer, are liable to have pin holes in the synthetic resin layer caused by galvanic corrosion of the aluminum in the substrate. The pin holes are passivated by aluminum oxide produced therein by anodically oxidizing the aluminum of the substrate in an electrolytic bath, the electric voltage of which is well below the normal passivation voltage for aluminum.

REFERENCES:
patent: 3721613 (1973-03-01), Wilhelm et al.
patent: 3775266 (1973-11-01), Ikeda et al.
patent: 3886052 (1975-05-01), Smith
patent: 4074016 (1978-02-01), Trippel
H. R. Fleck, Method of Coating Magnetic Disks, IBM Tech. Disc. Bulletin, vol. 12, No. 4, Sep. 1969, pp. 601.
E. Bassous et al., Protective Coating For a Magnetic Disc, IBM Tech. Disc. Bulletin, vol. 17, No. 1, Jun. 1974, pp. 283.

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