Plating on aluminum alloys

Details Plating on aluminum alloys Plating on aluminum alloys

C - Chemistry, Metallurgy

25

D

204/18.7

C25D 5/44 (2006.01)

Patent

CA 1132087

KGW (CASE 1242) DC PLATING ON ALUMINUM ALLOYS Abstract of the Disclosure - In accordance with certain of its aspects, the process of this invention for plating aluminum comprises contacting said aluminum with an aqueous activating bath containing a stannate salt selected from the group consisting of sodium stannate and potassium stannate in a concentration of about 40 grams per liter of tin as stannate; of at least one member of the group consisting of sodium and potassium hydroxide in a concentration of from 1.2 grams per liter to 12 grams per liter; and 0.01 gram per liter to 25 grams per liter of at least one member of the group consisting of methyl cellulose ethers, polyvinyl alcohols, polyethylene oxide, and polyethylene glycols; maintaining said aluminum and said aqueous bath in contact, thereby activating the surface of said aluminum, withdrawing from said aqueous bath said aluminum bearing a film of said aqueous bath, immersing said aluminum bearing said film as cathode in an alkaline bronze strike bath containing an anode thereby depositing a bronze strike plate on said aluminum, and establishing a negative potential on said aluminum bearing said film with respect to said anode prior to the time said aluminum is immersed in said alkaline bronze strike bath. - i -

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