MOLTEN ZN-AL ALLOY-PLATED STEEL SHEET AND MANUFACTURING METHOD THEREOF

WIPO Patent Application WO/2013/022118

A1

A molten Zn-Al alloy-plated steel sheet with excellent blackening resistance and corrosion resistance, and a manufacturing method thereof are provided. On at least one surface of the steel sheet, a molten Zn-Al alloy plating layer is formed having a composition comprising, in mass%, Al: 3.0-6.0%, Mg: 0.2-1.0% and Ni: 0.01-0.10%, the remainder consisting of Zn and unavoidable impurities, and further, a chemical conversion film containing molybdates is formed as the upper layer of said molten Zn-Al alloy plating layer. By this means, the surface of the plating layer has a structure containing, by surface area ratio, 1-50% of a Zn-Al-Mg ternary eutectic, and, by means of the material / structure of the plating layer and also the chemical conversion film containing molybdates formed on the upper layer of said plating layer, this molten Zn-Al alloy plated steel sheet has excellent blackening resistance and corrosion resistance.

FUJISAWA HIDESHI (JP)
OOI TOSHIHIKO (JP)
FURUTA AKIHIKO (JP)
SATOH SUSUMU (JP)
IMOKAWA TORU (JP)

PCT/JP2012/070719

February 14, 2013

August 08, 2012

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JFE GALVANIZING & COATING CO LTD (JP)
JFE STEEL CORP (JP)
FUJISAWA HIDESHI (JP)
OOI TOSHIHIKO (JP)
FURUTA AKIHIKO (JP)
SATOH SUSUMU (JP)
IMOKAWA TORU (JP)

C23C2/06; C23C18/04; C23C22/40; C23C28/00

JP2010255084A	2010-11-11
JP2005146339A	2005-06-09
JP2005146340A	2005-06-09
JP2001262303A	2001-09-26
JPS5735671A	1982-02-26
JP2002371345A	2002-12-26

SUGIMURA, KENJI (JP)
Kenji Sugimura (JP)

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