Method for phosphatizing a steel strip

Details Method for phosphatizing a steel strip Method for phosphatizing a steel strip

C - Chemistry, Metallurgy

23

C

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

Patent

CA 2303877

The invention concerns a method for phosphatizing a steel strip or a zinc- coated or galvanized steel strip by depositing an alloy on one or two surfaces, by spraying or immersion, for 2 to 20 seconds, with an acid phosphatizing solution, containing zinc, magnesium and manganese, at a temperature of the order of 50 to 70 ~C. Said method is characterised in that the phosphatizing solution does not contain nitrate ions and that it contains: between 1 and 4 g/l of zinc ions, between 1.2 and 4 g/l of manganese ions, between 1 and 4 g/l of magnesium ions, between 10 and 30 g/l of phosphate ions, between 0.1 and 3 g/l of hydroxylamine in free, ionic or combined form. The acid content of said phosphatizing solution ranges between 0.4 and 4 points and its total acid content is of the order of 15 to 45 points.

L'invention concerne un procédé de phosphatation d'un feuillard d'acier ou d'un feuillard d'acier zingué ou galvanisé par dépôt d'alliage sur une ou deux faces, par pulvérisation ou par immersion, pendant 2 à 20 secondes, avec une solution de phosphatation acide, contenant du zinc, du magnésium et du manganèse, à une température de l'ordre de 50 à 70 ·C. Ce procédé se caractérise en ce que la solution de phosphatation ne comprend pas d'ions de nitrate et qu'elle contient: entre 1 et 4 g/l d'ions de zinc, entre 1,2 et 4 g/l d'ions de manganèse, entre 1 et 4 g/l d'ions de magnésium, entre 10 et 30 g/l d'ions de phosphate, entre 0,1 et 3 g/l d'hydroxylamine sous forme libre, ionique ou liée. La teneur en acide de cette solution de phosphatation se situe entre 0,4 et 4 points et sa teneur en acide total est de l'ordre de 15 à 45 points.

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