Method of preparing substrates for memory disk applications

Details Method of preparing substrates for memory disk applications Method of preparing substrates for memory disk applications

1992-12-30

1995-02-21

Beck, Shrive

Coating processes

Magnetic base or coating

Magnetic coating

427131, 427304, 427305, 427437, 427438, 4274431, C23C 2600

Patent

active

053913957

ABSTRACT:
An improved process is disclosed for treating aluminum for memory disk applications and for producing metal plated aluminum memory disks. It has been found that a solution prepared from methane sulfonic acid and sodium peroxydisulfate can be used as a direct replacement for a nitric acid bath in the processing of aluminum substrates for memory disk application. In accordance with the present invention, the methane sulfonic acid/sodium peroxydisulphate solution can be used to deoxidize the aluminum substrate prior to zinc deposition and also to remove the first zinc film in either alkaline or acid double zinc plating processes.

REFERENCES:
patent: 3202529 (1965-08-01), Dunlap
patent: 4042382 (1977-08-01), Feldstein
patent: 4244739 (1981-01-01), Cagnassi
patent: 4657788 (1987-04-01), Benton
patent: 4659605 (1987-04-01), Malik
patent: 5069967 (1991-12-01), Yokoyama
patent: 5141778 (1992-08-01), Yarkosky

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