Non-chromated oxide coating for aluminum substrates

Details Non-chromated oxide coating for aluminum substrates Non-chromated oxide coating for aluminum substrates

1990-05-17

1994-03-29

Beck, Shrive

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

427305, 427435, 427437, 148243, 148274, 148284, 148286, C23C 2256

Patent

active

052980928

ABSTRACT:
(A.) A process for forming a cobalt conversion coating on a metal substrate, thereby imparting corrosion resistance and paint adhesion properties. The invention was developed as a replacement for the prior art chromic acid process. The process includes the steps of: (a) providing a cobalt conversion reaction solution comprising an aqueous, alkaline solution containing a soluble cobalt-III hexacoordinated complex, the concentration of the cobalt-III hexacoordinated complex being from about 0.1 mole per gallon of solution to the saturation limit of the cobalt-III hexacoordinated complex; and (b) contacting the substrate with the aqueous reaction solution for a sufficient amount of time, whereby the cobalt conversion coating is formed. The substrate may be aluminum or aluminum alloy, as well as Cd plating, Zn plating, Zn-Ni plating, and steel. The cobalt-III hexacoordinated complex may be present in the form of [Co(NH.sub.3).sub.6 ]X.sub.3 wherein X is Cl, Br, NO.sub.3, CN, SCN, Y.sub.3 PO.sub.4, SO.sub.4, C.sub.2 H.sub.3 O.sub.2, or Y.sub.2 CO.sub.3.

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