Surface-treated steel sheet and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9428823-B2
Application number	US-201214007564-A
Country	US
Kind code	B2
Filing date	Mar 29, 2012
Priority date	Mar 29, 2011
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

A surface-treated steel sheet includes: a steel sheet; and a coated layer which is formed on one surface or both surfaces of the steel sheet and includes zinc and vanadium, wherein the coated layer has a vanadium content of 1% or higher and 20% or less and a coating weight of 3 g/m 2 or higher and 40 g/m 2 or less, and has a plurality of dendritic arms that are grown in a thickness direction of the steel sheet, and a ratio x/y of a content x of vanadium that is present outside the arms to a content y of vanadium that is present inside the arms is 1.1 or higher and 3.0 or less in terms of vanadium element.

First claim

The invention claimed is:

1. A surface-treated steel sheet comprising:
a steel sheet; and
a coated layer which is formed on one surface or both surfaces of the steel sheet and includes zinc and vanadium,
wherein the coated layer has a vanadium content of 1% or higher and 20% or less and a coating weight of 3 g/m 2 or higher and 40 g/m 2 or less, and has a plurality of dendritic arms that are grown in a thickness direction of the steel sheet, and
wherein a ratio x/y of a content x of the vanadium that is present outside the arms to a content y of the vanadium that is present inside the arms is 1.1 or higher and 3.0 or less in terms of the vanadium element.

2. The surface-treated steel sheet according to claim 1 ,
wherein the coated layer has an emissivity of 0.30 or higher and 0.95 or less in a region where a wave number measured under a condition of a surface temperature of 100° C. is 600 to 3000 cm −1 .

3. The surface-treated steel sheet according to claim 1 or 2 ,
wherein a surface roughness of the coated layer is 1.0 μm or higher and 4.0 μm or less in terms of center-line average roughness Ra specified in JIS B 0601:2001.

4. The surface-treated steel sheet according to claim 1 or 2 ,
wherein one or more layers of films are further formed on the coated layer.

5. The surface-treated steel sheet according to claim 4 ,
wherein the film contains an organic resin.

6. The surface-treated steel sheet according to claim 5 ,
wherein the film is a resin film, and contains:
5 to 50 parts by mass of metal oxide particles with respect to 100 parts by mass of a solid content of the resin film; and
0.1 to 30 mass % of a lubricant with respect to 100 mass % of the solid content of the resin film.

7. The surface-treated steel sheet according to claim 5 ,
wherein the organic resin has at least one type of a carboxyl group, a hydroxyl group, a sulfonic acid group, and a silanol group in its structure, and includes:
a polyester resin containing a sulfonic acid group;
a curing agent; and
a coloring pigment containing carbon black.

8. The surface-treated steel sheet according to claim 4 ,
wherein the film is obtained by applying and drying a water-based metal surface treatment agent containing a silane coupling agent onto the steel sheet.

9. The surface-treated steel sheet according to claim 8 ,
wherein the film further contains an inhibitor component which essentially includes a fluorometal complex compound having at least one type selected from titanium and zirconium.

10. The surface-treated steel sheet according to claim 8 ,
wherein the film is a composite film including:
a polyether polyurethane resin; and
a coloring pigment containing carbon black.

11. The surface-treated steel sheet according to claim 5 ,
wherein the film is a coloring painted film layer including a coloring pigment layer.

12. The surface-treated steel sheet according to claim 11 ,
wherein the coloring painted film layer includes a primer-painted film layer, and
the primer-painted film layer is formed between the coated layer and the coloring pigment layer and includes a rust-preventive agent.

13. The surface-treated steel sheet according to claim 11 ,
wherein the coloring painted film layer is formed on the coated layer to be in contact therewith.

14. The surface-treated steel sheet according to claim 11 ,
wherein a chemical conversion treatment layer is further included between the coloring painted film layer and the coated layer.

Assignees

• Shibao Fumio
• Kaneto Taihei
• Fuda Masahiro
• Kimata Yoshio
• Nippon Steel & Sumitomo Metal Corp

Inventors

• Shibao Fumio
• Kaneto Taihei
• Fuda Masahiro
• Kimata Yoshio

Classifications

• Y10T428/12472

  Microscopic interfacial wave or roughness · CPC title

• C23C30/00

  Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence) · CPC title

• C23C2/06 Primary

  Zinc or cadmium or alloys based thereon · CPC title

• B05D2350/65

  metal layer · CPC title

• B05D7/14

  to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23) · CPC title