TERNARY HOT-DIP GALVANNEALED STEEL SHEET SURFACE TREATMENT SOLUTION COMPOSITION FOR PROVIDING EXCELLENT BLACKENING RESISTANCE AND ALKALI RESISTANCE, TERNARY HOT-DIP GALVANNEALED STEEL SHEET SURFACE-TREATED USING SAME, AND MANUFACTURING METHOD THEREFOR

Title:

Document Type and Number:

WIPO Patent Application WO/2021/060818

Kind Code:

A1

Abstract:

The present invention relates to a surface treatment composition comprising, on the basis of 100 wt% of the solid part of the composition, 20-40 wt% of a water-soluble polyurethane resin, 40-60 wt% of a silane-based sol-gel resin in which three types of silane compounds are cross-linked, 5-15 wt% of a curing agent, 0.5-1.5 wt% of a corrosion inhibitor, 0.1-1.0 wt% of a molybdenum-based compound, 1.0-3.0 wt% of a silane coupling agent; 1.0-2.0 wt% of an organometallic complex,1.0-2.0 wt% of an acid scavenger, 0.1-1.0 wt% of an aluminum-based compound, and 1.0-2.0 wt% of a lubricant. A ternary hot-dip galvannealed steel sheet treated with a chromium-free surface treatment coating agent, according to one embodiment of the present invention, in particular, has excellent blackening resistance, alkali resistance and corrosion resistance and provides excellent effects without concern for problems, in chromium treatment, of additional equipment installation, an increase in manufacturing costs and environmental pollution.

Inventors:

CHO SOO-HYOUN (KR)
SON WON-HO (KR)

Application Number:

PCT/KR2020/012844

Publication Date:

April 01, 2021

Filing Date:

September 23, 2020

Export Citation:

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Assignee:

POSCO (KR)

International Classes:

C23C22/00; B05D7/14; C08L83/06; C09D5/00; C09D7/40; C09D175/04; C23C2/06; C23C2/26; C23C28/00

Foreign References:

KR20190076099A	2019-07-02
JP2019518141A	2019-06-27
KR101586840B1	2016-01-19
JP2000248379A	2000-09-12
US20120204762A1	2012-08-16
JPS5328857A	1978-03-17
JPS5171233A	1976-06-19
JP2002332574A	2002-11-22
JPH0796699A	1995-04-11
JP2005146340A	2005-06-09

Other References: