Aluminum substrate for magnetic recording media

Details Aluminum substrate for magnetic recording media Aluminum substrate for magnetic recording media

1984-03-01

1985-09-10

O'Keefe, Veronica

Metal treatment

Compositions

Heat treating

428629, 148 6, B21C 100

Patent

active

045404496

ABSTRACT:
An aluminum substrate for magnetic recording media such as magnetic disks, etc., is composed of an aluminum alloy plate containing 2 to 6% by weight magnesium and impurities in only limited amounts and having on the surface an anodic oxidation film with thickness more than 3 .mu.m formed by a chromic acid process. In the thus-anodized aluminum substrate, the occurrence of black spot defects is greatly reduced and the formation of cracks upon heating the substrate to high temperatures is prevented in spite of the thicker anodic oxidation film.

REFERENCES:
patent: 4430387 (1984-02-01), Nakagawa et al.

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