Title:
COATED STEEL SHEET AND COATED STEEL SHEET MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2022/044195
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide: a coated steel sheet that has a chrome-free sealing coating and an organic coating, that has a sufficiently black appearance, and that has a sufficient high corrosion resistance and adhesion at a processed part; and a method for manufacturing such a coated steel sheet. The present invention, in order to achieve the purpose, pertains to a coated steel sheet having sequentially disposed therein: a steel sheet; a zinc plating layer; a phosphate treated layer which is deposited in an amount of 2.02-7.0 g/m2 and in which the total deposition amount of Ni and Co is 202-100 mg/m2; a chrome-free sealing coating containing an oxoate of a group 4 metal, and a group 1 metal or a salt thereof; and an organic coating. The luminosity (L*) of the surface of the coated steel sheet is 55 or less.
Inventors:
NAGAYAMA HAYATE
MATSUNO MASANORI
UENO SHIN
MATSUNO MASANORI
UENO SHIN
Application Number:
PCT/JP2020/032350
Publication Date:
March 03, 2022
Filing Date:
August 27, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C23C28/00; B32B15/08; C23C22/08; C23C22/83
Domestic Patent References:
| WO2019187945A1 | 2019-10-03 | |||
| WO2017002805A1 | 2017-01-05 |
Foreign References:
| JP2005126811A | 2005-05-19 | |||
| JP2014510837A | 2014-05-01 | |||
| JP2020152986A | 2020-09-24 |
Attorney, Agent or Firm:
WASHIDA & ASSOCIATES (JP)
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