Title:
ZINC-PLATED STEEL PLATE WITH EXCELLENT BLACKENING RESISTANCE AND CORROSION RESISTANCE AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2015/075792
Kind Code:
A1
Abstract:
The present invention relates to a zinc-plated steel plate in which corrosion resistance and blackening resistance can coexist, and a manufacturing method therefor. This zinc-plated steel plate comprises a steel plate, a Zn-Al-Mg-Si alloy-plating layer formed on the surface of the steel plate, and an Al-containing coating formed on the plating layer, and is characterized in that: the Al in the Al-containing coating is separated from the plating layer by the presence of an insulating substance; and when observing the Al-containing coating from the direction that is perpendicular to the surface thereof, the Al coverage, which is defined as the ratio of the area of the portion of the plating layer concealed by the Al in said coating to the total area of the observation field, is 75-100%. In one embodiment, this zinc-plated steel plate is obtained by applying a coating, which comprises scale-like Al particles and an insulating substance in a solvent and in which the viscosities at shear rates of 1 s-1 and 10000 s-1 measured with a rotating viscometer at 25°C have been adjusted to 150-1500 mPa∙s and 50-150 mPa∙s, respectively, on the plating layer of the steel plate, and heating the steel plate in an induction heating furnace at a heating rate of 5-70°C/s to a peak metal temperature of 180-230°C.
Inventors:
UEDA KOHEI (JP)
MORISHITA ATSUSHI (JP)
KIMATA YOSHIO (JP)
TOSHIN KUNIHIKO (JP)
MORISHITA ATSUSHI (JP)
KIMATA YOSHIO (JP)
TOSHIN KUNIHIKO (JP)
Application Number:
PCT/JP2013/081314
Publication Date:
May 28, 2015
Filing Date:
November 20, 2013
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C23C28/00; B32B15/08; C09D161/28; C09D167/00; C23C2/06
Foreign References:
| JPH11207861A | 1999-08-03 | |||
| JP2008055732A | 2008-03-13 | |||
| JP2011206646A | 2011-10-20 | |||
| JP2007131906A | 2007-05-31 | |||
| JPH0617226A | 1994-01-25 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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