Title:
COMPOSITION FOR SURFACE TREATMENT OF MG-CONTAINING GALVANIZED STEEL SHEET AND MG-CONTAINING GALVANIZED STEEL SHEET SURFACE-TREATED USING SAME
Document Type and Number:
WIPO Patent Application WO/2020/045869
Kind Code:
A1
Abstract:
The present invention relates to a composition for surface treatment of an Mg-containing galvanized steel sheet comprising a trivalent chromium compound, a carboxylated vinylidene copolymer, and a cross-linking agent. The composition for surface treatment according to the present invention forms a chromium(III) film and is also cross-linked in coating and drying of the surface of a galvanized steel sheet, thereby forming a three-dimensional compact molecular structure. Thus, a galvanized steel sheet coated with the composition has a coating film with high ductility, and can reduce moisture and/or oxygen permeability such that, not only does a worked section have excellent corrosion resistance, but also the occurrence of darkening and/or black dots can be prevented even when exposed to high-temperature and high-humidity environment for a long period of time.
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Inventors:
PARK YOUNG-JUN (KR)
KIM YONG-WOON (KR)
KIM YONG-WOON (KR)
Application Number:
PCT/KR2019/010439
Publication Date:
March 05, 2020
Filing Date:
August 16, 2019
Export Citation:
Assignee:
POSCO (KR)
International Classes:
B05D3/02; C09D5/10; B05D7/14; B05D7/24; C09D127/08; C09D127/16; C23C2/06
Foreign References:
| KR20150075001A | 2015-07-02 | |||
| JP2000302821A | 2000-10-31 | |||
| KR101786358B1 | 2017-10-18 | |||
| KR900009037B1 | 1990-12-17 | |||
| CN108219601A | 2018-06-29 | |||
| KR101586840B1 | 2016-01-19 | |||
| KR101262497B1 | 2013-05-08 | |||
| KR101786392B1 | 2017-10-17 | |||
| KR101758474B1 | 2017-07-17 | |||
| US6037124A | 2000-03-14 | |||
| US20130231428A1 | 2013-09-05 |
Other References:
EMULSION POLYMERIZATION AND EMULSION POLYMERS, March 1997 (1997-03-01)
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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