ALLOYED HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT FORMABILITY AND POST-ADHESION DETACHMENT RESISTANCE, AND MANUFACTURING METHOD THEREFOR

WIPO Patent Application WO/2011/052268

A1

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 mixed layer that is formed on the surface of the alloyed hot-dip galvanization layer and contains a magnesium/zinc/phosphorus complex oxide and a water-soluble phosphorus compound. The complex oxide 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 is between 0.3 and 50. The total area of regions of the mixed layer that have at least 20 mg/m² of adhered phosphorus is between 20% and 80% of the total surface area of the mixed layer.

HONDA KAZUHIKO (JP)
SUZUKI NORIYUKI (JP)
IKEMATSU YOICHI (JP)

PCT/JP2010/061770

May 05, 2011

July 12, 2010

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NIPPON STEEL CORP (JP)
HONDA KAZUHIKO (JP)
SUZUKI NORIYUKI (JP)
IKEMATSU YOICHI (JP)

C23C2/06; C22C18/00; C22C38/00; C22C38/06; C22C38/14; C23C2/28; C23C2/40; C23C22/07; C23C22/08; C23C28/00

JP2002105657A	2002-04-10
JP2007297705A	2007-11-15
JP2003293168A	2003-10-15
JP2002226976A	2002-08-14
JPH08296065A	1996-11-12
JP2004323890A	2004-11-18
JPH03274251A	1991-12-05
JPH0413816A	1992-01-17
JPH01184227A	1989-07-21
JPH10510322A	1998-10-06

See also references of EP 2495346A4

SHIGA Masatake et al. (JP)
Masatake Shiga (JP)

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