Reducing or avoiding pinhole formation in autodeposition on...

Details Reducing or avoiding pinhole formation in autodeposition on... Reducing or avoiding pinhole formation in autodeposition on...

C - Chemistry, Metallurgy

09

K

C09K 13/06 (2006.01) B05D 3/10 (2006.01) B05D 7/14 (2006.01) C09D 5/08 (2006.01) C09K 13/08 (2006.01) C23C 2/26 (2006.01) C23F 11/10 (2006.01)

Patent

CA 2143668

Pinhole and blister formation during autodeposition coating of galvanized steel and similar zinciferous surfaces can be greatly reduced by exposing the zinciferous surfaces to a pinhole inhibiting aqueous HF solution containing a suitable additive before using an autodeposition process itself. The most effective additives are boric acid, polyphosphonic acids, and polyethylen- eimine.

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