Title:
ZINC-COATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2021/241338
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a zinc-coated steel sheet having excellent delayed fracture resistance properties at low cost by coating a surface of a zinc-coated steel sheet with a coating film that is effective for the prevention of delayed fracture without the need to alter the composition of a base steel sheet. An organic resin containing a rust-inhibiting additive capable of reducing a galvanic current flowing between a zinc coat and a base steel sheet is applied onto a zinc-coated steel sheet, thereby greatly inhibiting the invasion of hydrogen into the inside of the steel sheet to prevent delayed fracture of the steel sheet.
Inventors:
HASHIZUME YUKICHIKA (JP)
HATA KENTARO (JP)
MATSUDA TAKESHI (JP)
HATA KENTARO (JP)
MATSUDA TAKESHI (JP)
Application Number:
PCT/JP2021/018868
Publication Date:
December 02, 2021
Filing Date:
May 18, 2021
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C23C28/00; C23F11/00
Domestic Patent References:
| WO2018221989A1 | 2018-12-06 |
Foreign References:
| JP2015209585A | 2015-11-24 | |||
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| JP2011111671A | 2011-06-09 | |||
| JPH0221970A | 1990-01-24 | |||
| JP2003041384A | 2003-02-13 | |||
| JP2016160507A | 2016-09-05 | |||
| JP2017002354A | 2017-01-05 | |||
| JP2018044240A | 2018-03-22 | |||
| JP2018109216A | 2018-07-12 | |||
| JP2018168467A | 2018-11-01 | |||
| JP2018188707A | 2018-11-29 | |||
| JP2015209585A | 2015-11-24 | |||
| JP2019026893A | 2019-02-21 |
Other References:
YOO, J. D. ET AL.: "The effect of an artificially synthesized simonkolleite layer on the corrosion of electrogalvanized steel", CORROSION SCIENCE, vol. 70, 7 November 2012 (2012-11-07), pages 1 - 10, XP028990346, DOI: 10.1016/j.corsci.2012.10.024
SHINSAKU MATSUYAMA: "Delayed Fracture", 1989, THE NIKKAN KOGYO SHIMBUN, LTD.
TETSU-TO-HAGANE, vol. 95, no. 12, 2009, pages 887
See also references of EP 4134469A4
SHINSAKU MATSUYAMA: "Delayed Fracture", 1989, THE NIKKAN KOGYO SHIMBUN, LTD.
TETSU-TO-HAGANE, vol. 95, no. 12, 2009, pages 887
See also references of EP 4134469A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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