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US 12,735,781 B2Granted
Composition for treating surface of ternary hot-dip galvanized steel sheet having excellent corrosion resistance and environmental stability, ternary hot-dip galvanized steel sheet that is surface-treated using same, and method for manufacturing same
AssigneesPosco, Noroo Coil Coatings Co., Ltd.
InventorsSoo-Hyoun Cho, Dong-Yun Kim, Chang-Hoon Choi
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Abstract
The present invention relates to a composition for surface treatment to improve the corrosion resistance, environmental stability, and the like of a metal material, in particular, a hot-dip galvanized steel sheet used for construction materials, a ternary hot-dip galvanized steel sheet that is surface-treated using the composition, and a method for manufacturing the same.
Claims20
A composition for surface-treating a ternary hot-dip galvanized steel sheet, comprising:
- with respect to 100 wt % of solid part of a composition,
- (a) 15 to 45 wt % of chromium compound;
- (b) 45 to 75 wt % of rust prevention coating agent;
- (c) 0.1 to 3.0 wt % of rust prevention etchant;
- (d) 0.1 to 5.0 wt % of corrosion resistance additive;
- (e) 0.1 to 3.0 wt % of lubricant;
- and
- (f) 0.1 to 1.0 wt % of defoamer,
- wherein the chromium compound is obtained by adding (g) 0.5 to 5.0 wt % of phosphorous acid as a reducing agent and (h) 0.1 to 2.0 wt % of phosphoric acid as a catalyst in a solution of chromium nitrate A and chromate B.
6 more elements
Dependencies are inferred from the claim text.