C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 28/00 (2006.01) C23C 22/53 (2006.01)
Patent
CA 2742354
Provided is a method for manufacturing a galvanized steel sheet, wherein: a steel sheet is galvanized, the surface is exposed for 1 to 60 seconds to an aqueous solution with a pH of 4-6 and a temperature of 20-70°C containing zinc ion with a concentration in the range of 5-100g/l, and then the steel sheet is washed and dried. An example of an ideal zinc-containing solution would be, for instance, a solution that contains zinc sulfate. The aforementioned method enables an oxide layer, mainly composed of zinc with an average thickness of no less than 10nm, to be formed on the surface of the steel sheet, thereby enabling a galvanized steel sheet with excellent press-formability to be manufactured in a stable manner and over a short period of time.
Linvention concerne un procédé de production de tôle dacier galvanisé, dans lequel la surface de la tôle dacier est exposée pendant 1 à 60 secondes à une solution aqueuse dont le pH est compris entre 4 et 6, à une température comprise entre 20 et 70°C, contenant des ions zinc à une concentration comprise entre 5 et 100g/l, et enfin lavée et séchée. Un exemple de solution idéale contenant du zinc est une solution qui contient, par exemple, du sulfate de zinc. Le procédé précité permet de former une couche doxyde, essentiellement composée de zinc dépaisseur moyenne égale ou supérieure à 10nm, sur la surface de la tôle dacier, ce qui permet de produire une tôle dacier galvanisé présentant une excellente aptitude au formage sous presse, de manière stable et pendant une durée minimum.
Fujita Sakae
Hoshino Katsuya
Kajiyama Hiroshi
Makimizu Yoichi
Masuoka Hiroyuki
Jfe Steel Corporation
Moffat & Co.
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