Coating aluminum with a strippable copper deposit
AssigneeGould Inc.
InventorsBetty L. Berdan, Betty M. Luce
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Abstract
An improvement in providing a mechanically strippable copper plate on an aluminum carrier is achieved by pretreating the aluminum carrier with an alkaline, aqueous, alkali metal zincate composition containing a small amount of one or more water soluble iron, cobalt or nickel salts, and removing substantially all of the deposited zincate coating with acid prior to copper plating.
Claims13
A method of electroplating an aluminum carrier with a mechanically strippable copper electroplate, which method comprises providing said carrier with a coating by contacting said carrier with an aqueous, alkaline solution of alkali metal zincate containing at least about 0.25 g/l of a water soluble salt of a metal selected from the group consisting of iron, cobalt, nickel and mixtures thereof, and a complexing agent for the metal ions introduced as said water soluble salt,
- contacting said coated carrier with an acid to remove substantially all of said coating, and
- electroplating copper on the treated surfaces of said carrier.
A method of providing a temporary aluminum carrier with a densely nucleated copper coating, said method comprising:
- contacting said carrier with an aqueous composition prepared from the following ingredients:
- from about 45 to about 100 g/l of an alkali metal hydroxide;
- from about 4.5 to about 10 g/l of zinc oxide;
- from about 0.5 to about 3.0 g/l of a water soluble salt of a metal selected from the group consisting of iron, cobalt, nickel and mixtures thereof;
- and from about 25 to about 100 g/l of a complexing agent for metal ions introduced as said water soluble salt, thereby to form on said carrier a zincate coating;
- contacting said carrier with an acid to remove substantially all of the said coating, and
- electroplating said treated surface with copper to produce a densely nucleated copper coating on said carrier.
Dependencies are inferred from the claim text.