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Title:
ALLOYED HOT-DIP GALVANIZED STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2011/052269
Kind Code:
A1
Abstract:
Disclosed is an alloyed hot-dip galvanized steel sheet provided with: a steel sheet; an alloyed hot-dip galvanization layer that is formed on at least one surface of the steel sheet and contains between 0.05% and 0.5% aluminum and between 6% and 12% iron, by mass, with the remainder comprising zinc and unavoidable impurities; and a magnesium/zinc/phosphorus complex oxide layer that is formed on the surface of the alloyed hot-dip galvanization layer and contains between 0.1 mg/m² and 100 mg/m² magnesium, between 1 mg/m² and 100 mg/m² phosphorus, and zinc. The ratio between the amount of phosphorus and the amount of magnesium in the complex oxide layer is between 0.3 and 50. At the interface between the alloyed hot-dip galvanization layer and the complex oxide layer (5), the alloyed hot-dip galvanization layer has a flat region having an area ratio between 10% and 70% and a roughened-surface region that is closer to the steel sheet than the flat region is. The magnesium/zinc/phosphorus complex oxide layer contains an amorphous compound.

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Inventors:
HONDA KAZUHIKO (JP)
SUZUKI NORIYUKI (JP)
IKEMATSU YOICHI (JP)
Application Number:
PCT/JP2010/061797
Publication Date:
May 05, 2011
Filing Date:
July 12, 2010
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
HONDA KAZUHIKO (JP)
SUZUKI NORIYUKI (JP)
IKEMATSU YOICHI (JP)
International Classes:
C23C2/06; C22C18/00; C22C38/00; C22C38/14; C23C2/28; C23C2/40; C23C22/07; C23C22/08; C23C28/00
Foreign References:
JP2002105657A2002-04-10
JPH10510322A1998-10-06
JPH08296065A1996-11-12
JPH03274251A1991-12-05
JPH0413816A1992-01-17
JPH01184227A1989-07-21
JP2007297705A2007-11-15
JP2003293168A2003-10-15
JP2002226976A2002-08-14
JPS5974231A1984-04-26
JPS59190332A1984-10-29
Other References:
See also references of EP 2495347A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
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