Anodic coatings on aluminum for circuit packaging

Details Anodic coatings on aluminum for circuit packaging Anodic coatings on aluminum for circuit packaging

1989-08-25

1990-02-06

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 33, 204376, 204 58, C25D 1108

Patent

active

048986518

ABSTRACT:
A process for preparing aluminum alloy substrates for use in electrical packaging includes anodizing in an aqueous bath solution containing sulfuric acid, citric acid, urea, and ammoniated colloidal silica; the latter three components being a complexing agent, a leveling agent and a stabilizing agent, respectively, so as to result in an oxide layer having an amorphous structure which eliminates the necessity of sealing thick anodic coating.

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