Zinc-phosphatizing method using low nickel and/or cobalt...

Details Zinc-phosphatizing method using low nickel and/or cobalt... Zinc-phosphatizing method using low nickel and/or cobalt...

C - Chemistry, Metallurgy

23

C

C23C 22/12 (2006.01) C23C 22/16 (2006.01) C23C 22/18 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2247144

Described is a method of phosphatizing steel, aluminium or galvanized or alloy- plated steel or aluminium surfaces by spraying the surface with, or dipping the surface in, a zinc-containing phosphatization solution for between 3 seconds and 8 minutes. The method is characterized in that the phosphatization solution contains 0.2 to 3 g/l of zinc ions, 3 to 50 g/l of phosphate ions, 1 to 100 mg/l of nickel or cobalt ions, as well as one or more accelerators and not more than 0.5 g/l of nitrate ions. Optional additives are lithium, copper and/or manganese.

Procédé de phosphatisation de surfaces métalliques en acier et/ou en aluminium galvanisé ou revêtu d'alliage et galvanisé, selon lequel les surfaces métalliques sont mises en contact, par pulvérisation ou immersion, pendant une durée comprise entre 3 secondes et 8 minutes, avec une solution de phosphatation contenant du zinc, caractérisé en ce que la solution de phosphatation renferme 0,2 à 3 g/l d'ions zinc, 3 à 50 g/l d'ions phosphate, 1 à 100 mg/l d'ions nickel et/ou d'ions cobalt, un ou plusieurs accélérateurs et une teneur inférieure à 0,5 g/l d'ions nitrate. Comme composants pouvant être éventuellement ajoutés, on mentionne le lithium, le cuivre et/ou le manganèse.

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