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US 2025/0051929 A1Published application
Solution composition for steel sheet surface treatment, steel sheet surface-treated using same, and manufacturing method therefor
AssigneePosco
InventorsChang-Hoon Choi, Soo-Hyoun Cho, Tae-Chul Kim, Sung-Joo Kim
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Abstract
The present invention relates to a solution composition capable of improving pitting corrosion resistance and blackening resistance of a steel sheet, a steel sheet surface-treated using same, and a method for manufacturing the steel sheet.
Claims14
A solution composition for a surface treatment of a steel sheet, the solution composition comprising:
- (a) 20 to 60 wt % of trivalent chromium compound,
- (b) 0.1 to 10 wt % of acidity regulator,
- (c) 1 to 20 wt % of adhesion improver,
- (d) 1 to 20 wt % of corrosion resistance improver,
- (e) 0.01 to 3.0 wt % of pitting corrosion improver,
- (f) 1 to 20 wt % of co-solvent, and
- (g) a residual solvent
4 more elements
Dependencies are inferred from the claim text.