Hydrophilicizing sealer treatment for metal objects

Details Hydrophilicizing sealer treatment for metal objects Hydrophilicizing sealer treatment for metal objects

C - Chemistry, Metallurgy

09

D

C09D 5/08 (2006.01) C08J 3/03 (2006.01) C08K 3/34 (2006.01) C23C 22/66 (2006.01) F28F 13/18 (2006.01) F28F 19/06 (2006.01)

Patent

CA 2161247

Substantially improved resistance to sea water corrosion along with adequate hydrophilicity and retention or even improvement of hydrophilicity after exposure to high temperature can be provided on a metal substrate, particularly an aluminum alloy of the type used for heat exchanger fins, by an aqueous liquid hydrophilicizing treatment compositions containing poly{alkylene imine} and alkali metal silicate, and, optionally, polyether polyols. The hydrophilicizing treatment is preferably applied over a conventional conversion coating, particularly a chromium phosphate or chromium oxide conversion coating.

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