C - Chemistry – Metallurgy – 09 – K
Patent
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.
Fetherstonhaugh & Co.
Henkel Corporation
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