Title:
SURFACE TREATMENT SOLUTION COMPOSITION CONTAINING TRIVALENT CHROMIUM AND INORGANIC COMPOUND, AND METHOD FOR MANUFACTURING HOT DIP GALVANIZED STEEL SHEET SURFACE-TREATED USING SAME
Document Type and Number:
WIPO Patent Application WO/2020/085716
Kind Code:
A1
Abstract:
The present invention provides a surface treatment solution composition comprising: 30 to 51 wt% of a trivalent chromium compound comprising chromium phosphate (A) and chromium nitrate (B) and having a content ratio of A/(A + B) that satisfies 0.3 to 0.6; 5 to 15 wt% of silane coupling agent; 0.2 to 3 wt% of vanadium-based anti-corrosive rust inhibitor; 3 to 12 wt% of colloidal silica; 0.5 to 5 wt% of polysiloxane copolymer; and 14 to 61.3 wt% of water, a hot dip galvanized steel sheet surface-treated using same, and a manufacturing method thereof. The hot dip galvanized steel sheet treated with the surface treatment solution composition containing trivalent chromium has an excellent corrosion resistance, blackening resistance, pipe-forming oil reactivity, and alkali resistance.
Inventors:
CHO SOO-HYOUN (KR)
LEE KANG-MIN (KR)
LEE KANG-MIN (KR)
Application Number:
PCT/KR2019/013646
Publication Date:
April 30, 2020
Filing Date:
October 17, 2019
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C23C22/08; C09D5/08; C09D183/04; C23C2/06; C23C2/40; C23C28/00
Foreign References:
| KR101786358B1 | 2017-10-18 | |||
| KR20100049944A | 2010-05-13 | |||
| KR101786392B1 | 2017-10-17 | |||
| EP3385405A1 | 2018-10-10 | |||
| JP2009149926A | 2009-07-09 | |||
| KR20060123628A | 2006-12-01 | |||
| KR20050052215A | 2005-06-02 | |||
| KR20090024450A | 2009-03-09 | |||
| KR20040046347A | 2004-06-05 | |||
| JP2002069660A | 2002-03-08 |
Other References:
See also references of EP 3872228A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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