Process for treating high-density information disc recording sub

Details Process for treating high-density information disc recording sub Process for treating high-density information disc recording sub

1983-08-22

1984-09-04

Tufariello, Thomas

Chemistry: electrical and wave energy

Processes and products

204 321, 204 38B, C25D 110, C25D 534

Patent

active

044695632

ABSTRACT:
Copper recording substrates for high-density information discs are first passivated in an alkaline oxidizing bath and then the surface oxide layer formed thereby is removed in ammonium chloride solution. This treatment improves the adhesion of a subsequently applied thin layer of chromium which protects the recording substrate during subsequent plating steps.

REFERENCES:
patent: 4305791 (1981-12-01), Whitehurst

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