Process of producing aluminum substrate for magnetic recording m

Details Process of producing aluminum substrate for magnetic recording m Process of producing aluminum substrate for magnetic recording m

1984-03-01

1985-03-26

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

C25D 1108, C25D 1110

Patent

active

045071799

ABSTRACT:
An aluminum substrate suitable for making high-density magnetic recording media is produced by anodizing a surface of the aluminum substrate in an aqueous chromic acid solution at an electrolytic voltage higher than 60 volts. The anodic film thus formed has no black spot defects and also exhibits no cracks when the substrate is heated at a high temperature for forming a magnetic recording layer.
The effect is further improved by adding a small amount of oxalic acid to the electrolyte.

REFERENCES:
Surface Treatment of Al by Wernick et al., Robert Drager Ltd., 1964, p. 351.

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