C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/22 (2006.01) C23C 22/53 (2006.01)
Patent
CA 2381561
The aim of the present invention is to provide a phosphate treated zinc coated steel sheet with excellent workability. A steel sheet coated with a zinc based alloy has a phosphate treated coating on the surface thereof. The phosphate treated coating comprises mainly granulated crystals, specifically, crystals in which the average ratio of the mayor axis to the minor axis is not less than 1.00 and not more than 2.90. Moreover, the method for producing the phosphate treated coating uses a phosphate treatment solution in which the amount of Mg ions is .gtorsim. 6 g/l and the amount of Zn ions is .gtorsim. 0.5 g/l, or a phosphate treatment solution in which the amount of Mg ions is .gtorsim. 10 g/l, the amount of Zn ions is 0 .ltorsim. and < 0.5 g/l, and the amount of nitric acid ions is .gtorsim. 40 g/l. Moreover, the phosphate treated zinc coated steel sheet also has excellent corrosion resistance as the amount of Mg in the phosphate treated coating is not less than 10 mg/m2, and has excellent weldability as the coating amount is controlled to 0.5 to 3.0 g/m2.
L'invention concerne une plaque d'acier en métal à base de zinc traitée avec un phosphate comprenant une plaque d'acier en métal à base de zinc. Sa surface est enduite d'un film obtenu par traitement de la surface au phosphate. Ce film comprend des cristaux en grain comme principal ingrédient et les cristaux ont de préférence un rapport moyen entre un axe long et un axe court de 1,00 à 2,90. L'invention concerne aussi un procédé d'obtention de cette plaque d'acier consistant à la soumettre à un traitement au phosphate utilisant une solution de traitement au phosphate ayant une teneur en ions Mg de 6 g/l ou plus et une teneur en ions Zn de 0,5 g/l ou plus ou une solution présentant une teneur en ions Mg de 10 mg/m<2> ou plus, une teneur en ions Zn inférieur à 0,5 g/l et une teneur en ions phosphoriques de 40 g/l ou plus. La plaque en acier de métal à base de zinc présente une excellente formabilité et fait preuve d'une excellente résistance à la corrosion grâce à la solution de traitement au phosphate ayant une teneur en ions Mg de 10 g/l ou plus et d'une excellente soudabilité grâce au dosage du film allant de 0,5 à 3,0 g/m<2>.
Isizuka Kiyokazu
Ito Daisuke
Ooba Shigekazu
Sanada Keiichi
Shindou Hidetoshi
Nippon Steel Corporation
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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