Precoat conditioning treatment for autodeposition

Details Precoat conditioning treatment for autodeposition Precoat conditioning treatment for autodeposition

C - Chemistry, Metallurgy

23

F

C23F 11/167 (2006.01) B05D 3/10 (2006.01) B05D 7/14 (2006.01) C23C 22/53 (2006.01)

Patent

CA 2230278

Blemish and blister formation during autodeposition coating of non-ferrous metal surfaces, particularly galvanized steel and similar zinciferous surfaces, can be greatly reduced by exposing the surfaces to a blemish inhibiting aqueous solution of phosphonates, preferably from an aminophosphonic acid, before autodeposition coating.

Il est possible de diminuer en grande proportion la formation de taches et de cloques pendant le revêtement par dépôt automatique de surfaces de métaux non ferreux, particulièrement l'acier galvanisé et les surfaces zincifères de même nature, en exposant les surfaces, avant le revêtement par dépôt automatique, à une solution aqueuse antitaches à base de phosphonates, et de préférence d'un phosphonate issu d'un acide aminophosphonique.

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