Surface-treatment solution composition containing trivalent chromium and inorganic compound, zinc-based plated steel sheet surface-treated using same, and method for producing same
US-2019264334-A1 · Aug 29, 2019 · US
Composition for surface treatment of Mg-containing galvanized steel sheet and Mg-containing galvanized steel sheet surface-treated using same
US12305294B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12305294-B2 |
| Application number | US-201917271353-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 16, 2019 |
| Priority date | Aug 31, 2018 |
| Publication date | May 20, 2025 |
| Grant date | May 20, 2025 |
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- Title
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Abstract
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Provided is 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 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.
First claim
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The invention claimed is: 1. A composition for surface treatment of a Mg-containing galvanized steel sheet, the composition comprising a trivalent chromium compound, a carboxylated vinylidene copolymer, and a crosslinking agent, wherein the carboxylated vinylidene copolymer is included in an amount of 5 wt. % to 10 wt. % based on the composition, wherein the crosslinking agent is included in an amount of 1 wt. % to 5 wt. % based on the weight of the carboxylated vinylidene copolymer, and wherein the trivalent chromium compound is included in an amount of 10 wt. % to 20 wt. % based on the composition. 2. The composition of claim 1 , wherein the carboxylated vinylidene copolymer is prepared by copolymerization between a vinylidene-based monomer and a monomer having a carboxyl group. 3. The composition of claim 2 , wherein the copolymerization is surfactant-free emulsion copolymerization. 4. The composition of claim 2 , wherein the vinylidene-based monomer is included in an amount of 10 wt % to 15 wt % based on the emulsion copolymer material. 5. The composition of claim 2 , wherein the monomer having a carboxy group is included in an amount of 0.5 wt % to 1.5 wt % based on the weight of the vinylidene-based monomer.
Assignees
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Classifications
containing only metals · CPC title
After-treatment (C23C2/14 takes precedence) · CPC title
After-treatment of electroplated surfaces · CPC title
of alloys · CPC title
Use of solutions containing trivalent chromium but free of hexavalent chromium · CPC title
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- What does patent US12305294B2 cover?
- Provided is 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 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…
- Who is the assignee on this patent?
- Posco, Posco Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification B05D7/14. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue May 20 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).