Method for phosphating a steel band

C - Chemistry – Metallurgy – 23 – C

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

Patent

CA 2266625

The invention concerns a method for phosphating a steel band or a steel band galvanized or alloy-coated on one side or both sides by spraying or dipping for a period ranging from 2 to 15 seconds using an acid, zinc and manganese- containing phosphating solution at a temperature ranging from 40 to 70 ~C. Said method is characterized by a phosphating solution containing 1 to 4 g/l zinc ions, 0.8 to 3.5 g/l manganese ions, 10 to 30 g/l phosphate ions, 0.1 to 3 g/l free, ionic or bound hydroxylamine, and no more than 1 g/l nitrate ions, a free acid content ranging from 0.4 to 4 points and a total acid content ranging from 12 to 50 points. The phosphating solution contains optionally 0.8 to 3.5 g/l nickel or 0.002 to 0.2 g/l copper.

L'invention concerne un procédé pour la phosphatation d'un feuillard d'acier ou d'un feuillard d'acier galvanisé ou pourvu d'un dépôt d'alliage sur une face ou sur ces deux faces, consistant à traiter par pulvérisation ou par immersion, pendant 2 à 15 secondes, au moyen d'une solution de phosphatage acide contenant du zinc et du manganèse, présentant une température comprise entre 40 et 70 ·C, ledit procédé se caractérisant en ce que la solution de phosphatage contient 1 à 4 g/l d'ions zinc, 0,8 à 3,5 g/l d'ions manganèse, 10 à 30 g/l d'ions phosphate, 0,1 à 3 g/l d'hydroxylamine sous forme libre, ionique ou liée, et au maximum 1 g/l d'ions nitrate, et présente une teneur en acide libre comprise entre 0,4 et 4 points et une teneur totale en acide comprise entre 12 et 50 points. Ladite solution de phosphatation peut éventuellement contenir 0,8 à 3,5 g/l de nickel ou 0,002 à 0,2 g/l de cuivre.

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