Title:
SURFACE-TREATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2022/210650
Kind Code:
A1
Abstract:
This surface-treated steel sheet comprises: a steel sheet; a zinc-based plating layer formed on the surface of the steel sheet; and a chemical conversion layer formed on the surface of the zinc-based plating layer. The chemical conversion layer contains Si, C, O, and P. In the chemical conversion layer, the C concentration is 20.0 mass% or more, the O concentration is 15.0 mass% or more, the Si concentration is 10.0 mass% or more, the P concentration is 0.10 mass% or more. When the thickness of the chemical conversion layer is defined as t, when a surface layer region is defined as a range where the starting point is the surface of the chemical conversion layer and the end point is a position located t/10 from the surface of the chemical conversion layer in the thickness direction, when an interface-side region is defined as a range where the starting point is a position located 9t/10 from the surface of the chemical conversion layer in the thickness direction and the end point is the interface between the chemical conversion layer and the zinc-based plating layer, and when an intermediate region is defined as a region interposed between the surface layer region and the interface-side region, the maximum value of the P concentration in the surface layer region is 1.5-5.0 fold of the average P concentration in the intermediate region.
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Inventors:
SHIMIZU ATSUO (JP)
TOKUDA IKUMI (JP)
SHOJI HIROMASA (JP)
TOKUDA IKUMI (JP)
SHOJI HIROMASA (JP)
Application Number:
PCT/JP2022/015303
Publication Date:
October 06, 2022
Filing Date:
March 29, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C23C28/00; C23C22/07; C23C22/36; C23C22/53; C23C22/68
Domestic Patent References:
| WO2012147860A1 | 2012-11-01 | |||
| WO2014084371A1 | 2014-06-05 | |||
| WO2018083784A1 | 2018-05-11 | |||
| WO2016162422A1 | 2016-10-13 | |||
| WO2012147860A1 | 2012-11-01 |
Foreign References:
| JP2008133510A | 2008-06-12 | |||
| JP2009102688A | 2009-05-14 | |||
| JP2021055665A | 2021-04-08 | |||
| JP2020007606A | 2020-01-16 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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