Method of protecting an aluminum surface

Details Method of protecting an aluminum surface Method of protecting an aluminum surface

C - Chemistry, Metallurgy

25

D

204/21.5

C25D 11/08 (2006.01) C23C 22/00 (2006.01) C25D 11/14 (2006.01) C25D 11/18 (2006.01) C25D 11/24 (2006.01)

Patent

CA 2023203

ABSTRACT A method of providing corrosion protection for a specific aluminum base alloy while at the same time creating an olive drab color in the alloy. Samples of the aluminum base alloy after being cleaned were placed in a bath containing sulfuric acid. The reaction of the sulfuric acid with the aluminum base alloy creates a columnar substrate on the surface of the samples. The samples were removed from the sulfuric acid bath and neutralized in a sodium bicarbonate bath. Thereafter the samples were placed in a bath containing sodium dichromate and a surfactant. The surfactant lowers the surface tension sufficiently for the sodium dichromate to flow into the interstices of the columnar substrate to seal the surface from the surrounding environment while at the same time reacting to produce the olive drab color.

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