Title:
SOLUTION COMPOSITION CONTAINING TRIVALENT CHROME FOR SURFACE TREATMENT OF STEEL SHEET, GALVANIZED STEEL SHEET SURFACE-TREATED WITH SAME, AND METHOD FOR MANUFACTURING GALVANIZED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2019/093861
Kind Code:
A1
Abstract:
The present invention provides a solution composition for surface treatment, an alloying galvanized steel sheet surface-treated with the same, and a method for manufacturing the alloying galvanized steel sheet, the solution composition containing: 10-30 wt% of a trivalent chrome compound comprising chromium phosphate (A) and chromium nitrate (B), of which the content ratio A/(A+B) satisfies 0.3-0.6; 5-50 wt% of a silane compound; 0.2-3 wt% of a vanadium-based anti-rust and corrosion agent; 0.5-5 wt% of a cobalt-based anti-rust and corrosion agent; and 12-84.3 wt% of water. The alloying galvanized steel sheet comprising an inorganic coating layer containing trivalent chromium has excellent effects on corrosion resistance, blackening resistance, weldability, fuel resistance, and alkali resistance.
Inventors:
CHO SOO-HYOUN (KR)
SON WON-HO (KR)
SON WON-HO (KR)
Application Number:
PCT/KR2018/013812
Publication Date:
May 16, 2019
Filing Date:
November 13, 2018
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C23C22/08; C09D5/08; C23C2/06; C23C2/26; C23C2/40; C23C28/00
Foreign References:
| KR101786392B1 | 2017-10-17 | |||
| KR101786358B1 | 2017-10-18 | |||
| JP2005206872A | 2005-08-04 | |||
| JP2009127057A | 2009-06-11 | |||
| JP2009132952A | 2009-06-18 | |||
| KR20060123628A | 2006-12-01 | |||
| KR20050052215A | 2005-06-02 | |||
| KR20090106031A | 2009-10-08 | |||
| KR20040046347A | 2004-06-05 | |||
| JP2002069660A | 2002-03-08 |
Other References:
See also references of EP 3712300A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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