Title:
SURFACE-TREATED STEEL SHEET AND PROCESS FOR PRODUCING SURFACE-TREATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2017/155028
Kind Code:
A1
Abstract:
[Problem] To provide: a surface-treated steel sheet which includes, as a surface layer, a coating film having satisfactory adhesion to adhesives and which has excellent corrosion resistance; and a process for producing the surface-treated steel sheet.
[Solution] Provided is a surface-treated steel sheet which comprises a steel sheet, a zinc-containing deposit layer formed on the steel sheet by plating, and a coating film formed on the deposit layer. The coating film comprises an acrylic resin, zirconium, vanadium, phosphorus, and cobalt. In a cross-section of the coating film, the areal proportion of the acrylic resin in a region extending from the surface to a depth of 1/5 the film thickness is 80-100% by area, and the areal proportion of the acrylic resin in regions composed of a region extending from the film-thickness center of the coating film toward the surface to a distance corresponding to 1/10 the film thickness and a region extending from the film-thickness center toward the deposit layer to a distance corresponding to 1/10 the film thickness is 5-50% by area.
Inventors:
SHOJI HIROMASA (JP)
TOSHIN KUNIHIKO (JP)
UEDA KOHEI (JP)
MORISHITA ATSUSHI (JP)
TOSHIN KUNIHIKO (JP)
UEDA KOHEI (JP)
MORISHITA ATSUSHI (JP)
Application Number:
PCT/JP2017/009451
Publication Date:
September 14, 2017
Filing Date:
March 09, 2017
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C23C22/60; C23C28/00
Domestic Patent References:
| WO2015080268A1 | 2015-06-04 |
Foreign References:
| JP2012062565A | 2012-03-29 | |||
| JP2011252184A | 2011-12-15 |
Attorney, Agent or Firm:
KAMEYA, Yoshiaki et al. (JP)
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