Chrome-free coating compositions for surface-treating steel sheet including carbon nanotube, methods for surface-treating steel sheet and surface-treated steel sheets using the same

A technology of surface treatment and carbon nanotubes, applied in the direction of conductive coatings, polyether coatings, nanotechnology, etc., can solve the problems of low conductivity, poor corrosion resistance, etc., and achieve the effect of solving energy-saving problems

Inactive Publication Date: 2011-01-26
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the steel can have excellent corrosion resistance but exhibit very low electrical conductivity
In addition, when the actual surface roughness of the steel sheet exceeds 1 μm, the steel may have excellent electrical conductivity but exhibit poor corrosion resistance due to the surface of the steel sheet being exposed to severe corrosion environments

Method used

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  • Chrome-free coating compositions for surface-treating steel sheet including carbon nanotube, methods for surface-treating steel sheet and surface-treated steel sheets using the same
  • Chrome-free coating compositions for surface-treating steel sheet including carbon nanotube, methods for surface-treating steel sheet and surface-treated steel sheets using the same
  • Chrome-free coating compositions for surface-treating steel sheet including carbon nanotube, methods for surface-treating steel sheet and surface-treated steel sheets using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0055] Exemplary embodiments of the present invention will be described in more detail hereinafter. In this specification, the term "percentage (%)" used in the embodiments represents "% by weight" unless otherwise indicated.

[0056] Appearance, adhesion, corrosion resistance of processed parts, workability after final coating of galvanized steel sheets treated with each of the coating compositions for surface treatment of steel sheets prepared in the following Examples and Comparative Examples were measured , in-plane corrosion and electrical conductivity.

[0057] (1) Appearance evaluation

[0058] The appearance of the steel sheet was evaluated by observing stains or peeling with the naked eye.

[0059] (2) Adhesiveness

[0060] The steel panels were cross-cut at a scale of 100 / 100 and tape tested using transparent adhesive strips.

[0061] (3) Corrosion resistance of processed parts

[0062] An Erichsen test was performed on a sample of the steel plate with a bending...

Embodiment 1

[0070] A coating composition for steel plate surface treatment (solid content: 20%) was prepared by dissolving the following components in a mixed solution of ethanol and water: 180 parts by weight of a carboxyl-containing water-dispersible polyurethane resin (solid content: 30%), 250 Parts by weight of water-soluble acrylic resin containing carboxyl (solid content: 20%), 20 parts by weight of carbon nanotube paste (solid content: 30%)--wherein carbon nanotubes (solid content: 13%) are distributed in water-dispersible polyurethane In the resin, 145 parts by weight of silica sol with a particle size of 20 to 30 nm (solid content: 30%), 30 parts by weight of 2-glycyloxypropyltrimethoxysilane (solid content: 72%), 8 Parts by weight of a phosphate aqueous solution of hexammonium heptamolybdate tetrahydrate (solid content: 63%) and 15 parts by weight of carbodiimide (solid content: 40%). Coating a steel plate with the prepared steel plate surface treatment coating composition, and ...

Embodiment 2

[0072] The coating composition for steel plate surface treatment was prepared in the same manner as in Example 1, except that the content of the carbon nanotube paste was 30 parts by weight. Coating the steel plate with the coating composition for surface treatment of the steel plate prepared, and then drying at a PMT of 120° C. to prepare wherein the coating amount of the coating composition is 1500 mg / m 2 galvanized steel sheet.

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Abstract

There are provided a chrome-free coating composition for surface-treating a hot-dip galvanized steel sheet including carbon nanotube that is distributed in a water-dispersible urethane resin, and a surface-treated steel sheet using the same. The chrome-free coating composition for surface- treating a hot-dip galvanized steel sheet that include carbon nanotube and has excellent electric conductivity, comprising, based on the total solid weight of the composition: (a) 40 to 60 parts by weight of a water-soluble or water-borne organic resin; (b) 20 to 40 parts by weight of an inorganic metallic sol; (c) 2 to 5 parts by weight of a carbon nanotube paste including carbon nanotube (CNT); (d) 2 to 5 parts by weight of a metal oxide / phosphate-based anti-corrosion agent; (e) 5 to 15 parts by weight of an organic metal complex; (f) 3 to 7 parts by weight of a carbodimide crosslinking agent, and (g) the balance of water, ethanol or a mixture thereof. The steel sheet surface-treated with the composition may be useful to secure the corrosion resistance without including a chrome component and show its electric conductivity even when the coating composition is used at a coating amount of 1000 mg / m 2 or more.

Description

technical field [0001] The present invention relates to a chrome-free coating composition for the surface treatment of steel sheets comprising a carbon nanotube paste in which carbon nanotubes are distributed, and a steel sheet subjected to surface treatment using the same; more particularly, to such a steel sheet Coating composition for surface treatment, which enables surface-treated steel sheet to secure corrosion resistance, does not contain chromium component, and even when used at 1000 mg / m 2 It can also exhibit electrical conductivity when using the coating composition at a coating amount of 100 or higher, and a steel sheet that has been surface-treated using it. Background technique [0002] Compared with cold-rolled steel sheets and hot-rolled steel sheets, when a coating composed of zinc, nickel, aluminum, silica or a combination thereof is formed on the steel sheet, the steel sheet has excellent corrosion resistance and high-quality appearance . However, due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/00C23C2/06C09D7/48C09D7/61
CPCC08K3/04C23C2/26C09D5/24C09D7/1291C09D5/084C09D123/0869C09D163/00C09D171/00C08K3/041C09D7/70Y10T428/273C09D7/61C09D7/48C08L33/12C08L63/00C08L65/02C08L29/04C23C22/00C23C20/00B82Y30/00
Inventor 朴永俊金甲龙丁勳
Owner POHANG IRON & STEEL CO LTD
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