Method of improving the corrosion resistance of chemical...

Details Method of improving the corrosion resistance of chemical... Method of improving the corrosion resistance of chemical...

C - Chemistry, Metallurgy

23

C

148/23

C23C 22/78 (2006.01)

Patent

CA 1200740

METHOD OF IMPROVING THE CORROSION RESISTANCE OF CHEMICAL CONVERSION COATED ALUMINUM ABSTRACT OF THE DISCLOSURE A method for treating aluminum prior to applying a chemical conversion coating for improving its corrosion resistance especially when rigid requirements need to be met. The aluminum is alkaline cleaned and deoxidized, preferably with a non-chromated deoxidizer. A supplementary treatment consists of immersing the deoxidized aluminum in a potassium or sodium nitrite solution. The aluminum is then coated with a standard chemical conversion coating, and dried at a temperature between 110°F and 130°F. The resulting product is able to pass salt spray test requirements as outlined in the military specification.

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