Plated steel sheet having multilayer structure and manufacturing method therefor

A technology of multi-layer structure and manufacturing method, which is applied in the field of plated steel plate, and can solve problems such as easy peeling off of the plating layer, failure to apply, and brittle cracking, etc.

Inactive Publication Date: 2019-08-23
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the alloy phase formed by Zn-Mg alloy plating is the intermetallic compound Mg 2 Zn 11 , MgZn 2 , MgZn, Mg 7 Zn 3 etc., so it has a characteristic of being brittle (brittle) compared with Zn or Mg, so that many cracks or peeling (peel-off) are generated in the processing steps of the steel plate, so it is practically almost impossible to apply
That is, compared with pure zinc plating, Zn-Mg alloy plating has the characteristics of being hard and easy to be brittle, so the plating layer will also produce cracks (crack) and fall off easily in a small deformation, and the plating adhesion will be significantly reduced.
[0007] In addition, because the activity of Mg in the Zn-Mg coating is very high, the blackening phenomenon in which the surface of the product reacts with moisture in a humid atmosphere will reduce the quality of the product.

Method used

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  • Plated steel sheet having multilayer structure and manufacturing method therefor
  • Plated steel sheet having multilayer structure and manufacturing method therefor
  • Plated steel sheet having multilayer structure and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A general cold-rolled steel sheet is prepared as a base steel sheet, and then a first Zn layer is formed by an ordinary electrogalvanizing method.

[0047] Then, the steel plate is put into a vacuum chamber, and the foreign matter and natural oxide film on the surface are removed by plasma pretreatment, and then the second Mg layer and the third Zn layer are formed by electromagnetic levitation induction heating deposition method. Table 1 shows the thickness of each layer and the temperature at the time of deposition. When vacuum depositing the second Mg layer and the third Zn layer, the vacuum degree inside the chamber was kept at about 2×10 -2 ~9×10 -4 between mbars.

[0048] For the multilayer plated steel sheets manufactured as described above, blackening resistance, plating adhesion, corrosion resistance, etc. were evaluated and shown in Table 1 together.

[0049] At this time, for the evaluation of blackening resistance, the color difference before and after ho...

Embodiment 2

[0063] Next, under the same conditions as in Example 1, the first Zn layer, the second Mg layer, and the third Zn layer were produced to have thicknesses of 1 μm, 1 μm, and 3 μm, respectively. However, when vacuum-depositing the second Mg layer and the third Zn layer, the temperature of the substrate is varied from normal temperature to 160° C., and the degree of Zn diffusion of the third Zn layer is adjusted to produce a plated steel sheet.

[0064] For the plated steel sheets manufactured as described above, blackening resistance, plating adhesion, corrosion resistance and phase analysis were evaluated in the same manner as in Example 1, and the results are shown in Table 2 below. Table 2 also shows the results of analyzing the cross-section of the second Mg layer by transmission electron microscope-energy dispersive spectroscopy (TEM-EDS) point analysis with respect to the weight ratio of Zn diffused into the second Mg layer.

[0065] [Table 2]

[0066]

[0067] It was ...

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Abstract

The present invention relates to a plated steel sheet often used as materials for vehicles, home appliances, construction and the like and, more specifically, to a plated steel sheet having a multilayer structure and a method for manufacturing the same.

Description

technical field [0001] The present invention relates to a plated steel plate which is widely used in materials such as vehicles, household appliances, and buildings, and more particularly relates to a plated steel plate with a multi-layer structure and a manufacturing method thereof. Background technique [0002] The surface of steel sheet products used for vehicle materials, home appliances, building materials, etc. is galvanized by electroplating or hot-dip galvanizing to improve corrosion resistance and durability. This galvanized product has significantly improved corrosion resistance due to zinc's sacrificial corrosion protection compared to untreated general steel sheet products and is therefore used throughout the industry. [0003] However, in recent years, in related industrial fields, there has been an increasing demand for more corrosion-resistant, lightweight, and economical plated products, and thus technologies related to this have been actively developed. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/02C23C14/16C23C14/24C23C14/54C23C2/06C25D3/22
CPCC23C2/06C23C14/16C23C28/02C25D3/22C23C28/025C23C28/026C23C28/021C23C2/40C23C14/025C23C14/541C23C2/28C23C2/024C23C2/26C23C14/24C23C14/54B32B15/013B32B15/04C23C14/02C23C14/00C23C14/5806C23C14/024B32B15/043B32B15/18C23C18/00C23C28/028C23C28/023C23C14/34C23C30/00C23C30/005Y10T428/265Y10T428/24975Y10T428/12972Y10T428/264Y10T428/12792Y10T428/2495Y10T428/24967Y10T428/12729Y10T428/12785Y10T428/12799Y10T428/263Y10T428/12979
Inventor 高景弼南庆勋金兑烨李东烈郑勇华郑宇城
Owner POHANG IRON & STEEL CO LTD
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