Solution composition for surface treatment of steel sheet and surface-treated steel sheet using same
AssigneesPosco, Noroo Coil Coatings Co., Ltd.
InventorsChang-Hoon Choi, Dong-Yun Kim, Min-Ho Jo, Jae-Duck Ko, Won-Ho Son, Jong-Hwa Kim
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Abstract
Provided is a composition for surface treatment of a steel sheet, the composition having excellent resistance to an acid, such as sulfuric acid, and to a coated steel sheet to which the composition for surface treatment is applied, wherein the composition for surface treatment comprises 30-50% wt % of colloidal silica containing 5-20 nm-sized silica, 40-60% wt % of silane containing three or more alkoxy groups, 5-15 wt % of an acrylate-based organic monomer, 0.01-1 wt % of an acid, and 1-15 wt % of a solvent.
Claims6
A solution composition for surface treatment of a steel sheet, comprising:
- 30 to 50 wt % of colloidal silica containing 5 to 20 nm-sized silica particles;
- 40 to 60 wt % of silane containing at least three or more alkoxy groups;
- 5 to 15 wt % of an acrylate-based organic monomer;
- 0.01 to 1 wt % of acid;
- 0.1 to 5.0 wt % of an organic resin having a cyclic ring structure;
- and
- 1 to 15 wt % of a solvent,
- wherein the organic resin having the cyclic ring structure is at least one selected from the group consisting of polyurethane;
- an amino-modified phenolic resin;
- a polyester resin;
- and polyvinyl butyral, or a hybrid resin of two or more thereof, and
- wherein an acidity of the solution has a pH range of 1 to 5.
Dependencies are inferred from the claim text.