CHROMIUM-FREE SURFACE-TREATED GALVANIZED STEEL SHEET

WIPO Patent Application WO/2011/049238

A1

A water-based treating agent for metal surfaces which comprises a film-forming ingredient (c) comprising, in a specific ratio, an organosilicon compound (C) that has two or more specific functional groups and one or more specific hydrophilic functional groups in the molecule, has a specific molecular weight, and has a cyclic siloxane bond in the skeleton and a polyurethane resin (E) having a specific structural unit, an inhibitor ingredient (d) comprising, as an essential component, a fluorometal complex compound (H) having at least one element selected from titanium and zirconium, and an aqueous medium is applied and dried to thereby form a composite coating film comprising the ingredients. Thus, a galvanized steel sheet which underwent the chromium-free surface treatment is provided. The galvanized steel sheet has excellent properties concerning detergent resistance, sweat resistance, coating film adhesion, bondability, and water resistance and further has excellent processability and sliding properties.

MORISHITA ATSUSHI (JP)
KATSUMI TOSHIYUKI (JP)
SUZUKI YUKI (JP)
MORI YOICHIRO (JP)

PCT/JP2010/069014

April 28, 2011

October 20, 2010

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NIPPON STEEL CORP (JP)
MORISHITA ATSUSHI (JP)
KATSUMI TOSHIYUKI (JP)
SUZUKI YUKI (JP)
MORI YOICHIRO (JP)

C23C22/44; B05D7/14; B32B15/095; C23C22/36; C23C22/42; C23C28/00

JP2005120469A	2005-05-12
JP2006328445A	2006-12-07
JP2008025023A	2008-02-07
JP2004263252A	2004-09-24
JP2006152436A	2006-06-15
JP2008194839A	2008-08-28
JPH09295988A	1997-11-18

AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)

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