Title:
ZINC-BASED PLATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2023/100349
Kind Code:
A1
Abstract:
Provided is a zinc-based plated steel sheet comprising: a steel sheet; a Zn-based plating layer that is disposed on at least one surface of the steel sheet and that contains Al and Zn; and at least one chromate-free chemical conversion treatment layer disposed on the Zn-based plating layer, the amount attached on each surface being 0.1-15 g/m2. The chemical conversion treatment layer contains a resin and a yellow coloring agent. When the external appearance is evaluated by the CIE1976 (L*, a*, b*) color space, b* is between 2 and 60, inclusive, and b*/a* is between -3 and 3, inclusive. The 60-degree specular glossiness Gs (60°) is 5-200. The Zn-based plated steel sheet satisfies formula 1 (10 ≥ L*1/L*2 ≥ 2), where L*1 is L* obtained when light that is incident on the surface of the chemical conversion treatment layer at an angle of 60° from the surface and reflected at the surface at an angle of 135° is received from the surface, and L*2 is L* obtained when light that is incident on the surface at an angle of 120° from the surface and reflected at the surface at an angle of 135° from the surface is received.
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Inventors:
TOBA TETSUYA (JP)
TOSHIN KUNIHIKO (JP)
MORISHITA ATSUSHI (JP)
TOSHIN KUNIHIKO (JP)
MORISHITA ATSUSHI (JP)
Application Number:
PCT/JP2021/044473
Publication Date:
June 08, 2023
Filing Date:
December 03, 2021
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C23C28/00; C23C2/06; C23C26/00
Domestic Patent References:
| WO2020100286A1 | 2020-05-22 |
Foreign References:
| JP2019105098A | 2019-06-27 | |||
| JPS5232834A | 1977-03-12 | |||
| JPS63130756A | 1988-06-02 |
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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