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Zinc-based plated steel sheet having post-treated coating formed thereon and post-treatment method therefor

a zinc-based plated steel and coating technology, applied in the direction of liquid/solution decomposition chemical coating, coating, transportation and packaging, etc., can solve the problems of inferior decoating rate and good processability, and achieve excellent lubricity, weldability, adhesiveness, decoatability and paintability, and simple coating method

Inactive Publication Date: 2018-12-20
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent is about a zinc-based plated steel sheet with a post-treatment coating and a method of making it. The coating includes metal oxide salt and an organic compound, and the ratio of oxygen to metals is important. The metal oxide salt may come from an electrolyte used during the plating process. The resulting plated steel sheet has excellent lubricity, weldability, adhesiveness, decoatability, and paintability, which are important physical properties for use in automobiles. The method of post-treating the steel sheet is simple and cost-effective.

Problems solved by technology

However, in Comparative Example 2 in which the atomic ratio (O / M) of oxygen (O) to metals (M) is 2 or less, processibility and adhesiveness are inferior and, in Comparative Example 3 in which the atomic ratio (O / M) of oxygen (O) to metals (M) is 20 or greater, processibility and adhesiveness were good but has an inferior decoating rate because the decoating rate is 87% or less.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

##ventive example 1

Inventive Example 1

[0043]A zinc-based steel sheet having a thickness of 0.8 mm, an elongation of 36% to 37%, and a plating amount of 40 g / m2 and including a plating layer in which Al is 2.5%, Mg is 3% and Zn is 94.5% was prepared. A coating solution containing metal oxide salt containing 1 wt % of Mo and 0.2 wt % of B, 0.3 wt % of PEG, and the balance being water was applied to the steel sheet by a bar coating method and then a post-treatment coating having a coating weight of 300 mg / m2 was formed under a condition of PMT 100° C.

##ventive example 2

Inventive Example 2

[0044]A zinc-based steel sheet having a thickness of 0.8 mm, an elongation of 36% to 37%, and a plating amount of 40 g / m2 and including a plating layer in which Al is 2.5%, Mg is 3% and Zn is 94.5% was prepared. A coating solution containing metal oxide salt containing 1 wt % of Mo and 0.5 wt % of B, 0.5 wt % of PEG, and the balance being water was applied to the steel sheet by a bar coating method and then a post-treatment coating having a coating weight of 300 mg / m2 was formed under a condition of PMT 100° C.

##ventive example 3

Inventive Example 3

[0045]A zinc-based steel sheet having a thickness of 0.8 mm, an elongation of 36% to 37%, and a plating amount of 40 g / m2 and including a plating layer in which Al is 2.5%, Mg is 3% and Zn is 94.5% was prepared. A coating solution containing metal oxide salt containing 1 wt % of Mo and 1 wt % of B, 1 wt % of PEG, and the balance being water was applied to the steel sheet by a bar coating method and then a post-treatment coating having a coating weight of 300 mg / m2 was formed under a condition of PMT 100° C.

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Abstract

Provided is a zinc-based plated steel sheet having a post-treated coating filmed thereon including: a steel sheet; a zinc plated layer formed on the steel sheet; and a post-treated coating formed on the plated layer, wherein the atomic ratio (O / M) of oxygen (O) to metals (M) contained in the post-treated coating is greater than 2 and less than 20, and a method for post-treating a zinc-based plated steel sheet. According to this, the zinc-based plated steel sheet having the post-treated coating formed thereon has the effects excellent in lubricity, weldability, adhesiveness, film-removing property and paintability. As the method of post-treating a zinc-based plated steel sheet of the present invention employs a simple coating method irrespective of the kind of plating layer, the process is simple and economical and the process operation cost is low.

Description

TECHNICAL FIELD[0001]The present disclosure relates to a zinc-based plated steel sheet having a post-treatment coating formed thereon and a post-treatment method thereof.BACKGROUND ART[0002]A zinc-based plated steel sheet used for an automobile panel is inexpensive, has excellent corrosion resistance, has a fine surface appearance, and usage thereof is increasing for automobile interior and exterior panels. During an automobile manufacturing process, a plated steel sheet is sequentially subjected to a pressing process, an assembling process such as welding and bonding, a debinding process, a phosphating process, and a painting process, and here, a zinc plated steel sheet is required to have physical properties such as lubricity, weldability, adhesiveness, decoatability, paintability, and the like.[0003]The zinc-based plated steel sheet has different physical properties according to compositions of a plating layer formed on the steel sheet and manufacturing methods and inferior physi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C2/26C23C2/06C23C2/40C23C22/40
CPCC23C2/26C23C2/06C23C2/40C23C22/40C23C18/00C23C22/74C09D1/00Y10T428/12556Y10T428/12576Y10T428/12597Y10T428/12604Y10T428/12611Y10T428/12618Y10T428/1266Y10T428/12667Y10T428/12799Y10T428/12806Y10T428/12819Y10T428/12826Y10T428/12972Y10T428/12979Y10T428/12993Y10T428/2495Y10T428/24967Y10T428/26Y10T428/263Y10T428/264Y10T428/265Y10T428/27B32B15/013B32B15/04B32B15/043B32B15/18C23C20/00C23C20/02C23C20/04C23C20/06C23C22/00C23C22/05C23C22/06C23C22/46C23C22/48C23C22/53C23C22/68C23C30/00C23C30/005
Inventor KIM, YEON-HOKIM, YUNG-KEUNPARK, YOUNG-JUNKIM, YONG-WOON
Owner POHANG IRON & STEEL CO LTD