Title:
SOLUTION COMPOSITION FOR SURFACE TREATMENT OF STEEL SHEET AND STEEL SHEET SURFACE-TREATED USING SAME
Document Type and Number:
WIPO Patent Application WO/2019/124865
Kind Code:
A1
Abstract:
The present invention relates to a surface-treated steel sheet comprising: a steel sheet; a nickel plating layer formed on at least one surface of the steel sheet; and a corrosion-resistant coating layer formed on the nickel plating layer, wherein the corrosion-resistant coating layer comprises: a product formed by a hydrolysis reaction of silica and an alkoxy silane; and an acrylate-based polymer, and contains (C) 25-65 wt% of carbon (C), 20-70 wt% of silicon (Si), and 1-40 wt% of oxygen (O), the ratio of bonds of silicon (Si) and oxygen (O) (Si-O bonds) and bonds of silicon (Si) and carbon (C) being 80-95% : 5-20%. According to the present invention, the composition provided in the present invention is coated on a surface of a steel sheet, so that corrosion resistance to sulfuric acid can be provided to the steel sheet without changing the composition of the steel sheet. In addition, the composition for surface treatment according to the present invention can extend the lifespan of the steel sheet by providing excellent corrosion resistance to sulfuric acid and chloric acid to a structure. Furthermore, the nickel plating layer is included between the steel sheet and the coating layer, and thus can mitigate the local corrosion of the steel sheet.
Inventors:
CHOI CHANG-HOON (KR)
SON WON-HO (KR)
HONG YOUNG-KWANG (KR)
CHO HONG-LEA (KR)
KIM MYUNG-SOO (KR)
SON WON-HO (KR)
HONG YOUNG-KWANG (KR)
CHO HONG-LEA (KR)
KIM MYUNG-SOO (KR)
Application Number:
PCT/KR2018/015756
Publication Date:
June 27, 2019
Filing Date:
December 12, 2018
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C25D5/48; C09D5/08; C09D7/65; C09D183/04; C22C38/02; C22C38/04; C22C38/06; C22C38/16; C22C38/60; C25D3/12
Foreign References:
| KR20130060593A | 2013-06-10 | |||
| KR101499352B1 | 2015-03-05 | |||
| KR20100079436A | 2010-07-08 | |||
| JPS6160766A | 1986-03-28 | |||
| JP2010150620A | 2010-07-08 | |||
| KR20180035283A | 2018-04-06 | |||
| KR20130151739A | 2013-12-06 | |||
| KR20130145717A | 2013-11-27 | |||
| KR20130141627A | 2013-12-26 | |||
| KR20130130161A | 2013-12-02 |
Other References:
See also references of EP 3730675A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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