Metal treatment – Compositions – Heat treating
Patent
1983-03-21
1984-05-29
Childs, Sadie L.
Metal treatment
Compositions
Heat treating
148 62, C23C 108, C23F 700
Patent
active
044513046
ABSTRACT:
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 of sodium nitrite solution. The aluminum is then coated with a standard chemical conversion coating, and dried at a temperature between 110.degree. F. and 130.degree. F. The resulting product is able to pass salt spray test requirements as outlined in the military specification.
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