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Title:
GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME
Document Type and Number:
WIPO Patent Application WO/2010/070942
Kind Code:
A1
Abstract:
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.

Inventors:
MAKIMIZU YOICHI (JP)
KAJIYAMA HIROSHI (JP)
FUJITA SAKAE (JP)
YOSHIMI NAOTO (JP)
TADA MASAHIKO (JP)
MASUOKA HIROYUKI (JP)
HOSHINO KATSUYA (JP)
NAGOSHI MASAYASU (JP)
Application Number:
PCT/JP2009/058426
Publication Date:
June 24, 2010
Filing Date:
April 22, 2009
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
MAKIMIZU YOICHI (JP)
KAJIYAMA HIROSHI (JP)
FUJITA SAKAE (JP)
YOSHIMI NAOTO (JP)
TADA MASAHIKO (JP)
MASUOKA HIROYUKI (JP)
HOSHINO KATSUYA (JP)
NAGOSHI MASAYASU (JP)
International Classes:
C23C28/00; C23C22/53
Foreign References:
JP2003306781A2003-10-31
JP2000328220A2000-11-28
JPS5360332A1978-05-30
JPH02190483A1990-07-26
JP2003306781A2003-10-31
JP2004003004A2004-01-08
Other References:
See also references of EP 2366812A4
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JP)
Ken-ichiro Ochiai (JP)
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