Title:
PRECOATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2024/071191
Kind Code:
A1
Abstract:
A precoated steel sheet according to the present invention addresses the problem of achieving more excellent scratch resistance and more excellent coating film adhesion even in cases where a coating film has a large film thickness. This precoated steel sheet comprises a Zn-containing plating layer, a chemical conversion coating layer containing at least zirconium, and a coating layer; the coating layer contains at least a binder resin and resin particles; the average thickness of the coating film is 3 µm to 10 µm; the intensity of zirconium at the Zn-containing plating layer-side interface of the coating layer is 1.05 to 3.00 times the average intensity of zirconium in the range of 1 µm to 2 µm from the surface of the coating film as calculated based on the depth profile of the zirconium distribution of the coating film as determined by glow discharge optical emission spectrometry; and if a cross-section of the coating film in the thickness direction is examined, the average area ratio of the resin particles in a region having a length of 60 µm in a direction that is perpendicular to the thickness direction is 5% to 30%.
Inventors:
FUJII TAKASHI (JP)
KAWAMURA YASUAKI (JP)
HIRAI AKIKO (JP)
TOSHIN KUNIHIKO (JP)
FUJITA KOHEI (JP)
KUROKAWA FUMIYA (JP)
NAKAGAWA JUN (JP)
KAWAMURA YASUAKI (JP)
HIRAI AKIKO (JP)
TOSHIN KUNIHIKO (JP)
FUJITA KOHEI (JP)
KUROKAWA FUMIYA (JP)
NAKAGAWA JUN (JP)
Application Number:
PCT/JP2023/035134
Publication Date:
April 04, 2024
Filing Date:
September 27, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B32B15/08; C23C28/00
Domestic Patent References:
| WO2022149596A1 | 2022-07-14 | |||
| WO2017155028A1 | 2017-09-14 |
Foreign References:
| JP2012062565A | 2012-03-29 | |||
| JP2022149319A | 2022-10-06 |
Attorney, Agent or Firm:
HAGIWARA, Yasushi et al. (JP)
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