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Zn alloy plated steel sheet having excellent phosphatability and spot weldability and method for manufacturing same

一种制造方法、合金钢板的技术，应用在热浸镀工艺、金属材料涂层工艺、涂层等方向，能够解决熔点低、熔融镀覆钢板点焊性、变差等问题，达到磷酸盐处理性优异、点焊性优异的效果

Active Publication Date: 2017-08-29
POSCO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low melting point of the Zn-Mg-Al compound in the above-mentioned galvanized alloy steel sheet, it is easy to cause melting during welding, and there is a disadvantage that the spot weldability of the coated steel sheet is deteriorated.

Method used

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  • Zn alloy plated steel sheet having excellent phosphatability and spot weldability and method for manufacturing same
  • Zn alloy plated steel sheet having excellent phosphatability and spot weldability and method for manufacturing same
  • Zn alloy plated steel sheet having excellent phosphatability and spot weldability and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Prepare a base steel sheet as a test piece for coating. The base steel sheet is a low-carbon cold-rolled steel sheet with a thickness of 0.8 mm, a width of 100 mm and a length of 200 mm. The base steel sheet is then immersed in acetone and ultrasonically cleaned to remove surface presence Impurities such as rolling oil. After that, plasma treatment was performed on the surface of the test piece for plating to control the centerline average roughness (Ra) in the range of 1.0 to 1.1 μm. After that, after performing a 750°C reduction atmosphere heat treatment in order to ensure the mechanical properties of the steel sheet in an ordinary hot-dip coating operation, it was immersed in a plating solution having the composition of Table 1 below to produce a galvanized alloy steel sheet. At this time, for all the examples, the plating solution temperature was 450°C, and the surface temperature of the base steel sheet into which the plating solution was introduced was fixed at 460...

Embodiment 2

[0080] The following Table 3 shows the content of each alloy element contained in the Zn single-phase structure of the galvanized alloy steel sheet of Example 1 and the corrosion resistance evaluation results.

[0081] At this time, for the content of each alloy contained in the Zn unidirectional structure, after cutting the galvanized alloy steel sheet vertically, the cross-sectional photograph was taken with a Field Emission Scanning Electron Microscope (FE-SEM, Field Emission Scanning Electron Microscope) at 3000 times, and EDS (Energy Dispersive Spectroscopy) was used to analyze the Zn single-phase structure to measure the content of each alloy element.

[0082] In addition, in the evaluation of corrosion resistance, after each galvanized alloy steel sheet was loaded into a salt spray test machine, the time for red rust to occur was measured in accordance with the international standard (ASTM B117-11). At this time, 5% salt water (temperature 35℃, pH6.8) was used, and 2ml / 80cm ...

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PUM

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Abstract

A Zn alloy plated steel sheet having excellent phosphatability and spot weldability and a method for manufacturing the same are provided. In the Zn alloy plated steel sheet including a base steel sheet and a Zn alloy plating layer, the Zn alloy plating layer includes, by wt%, Al: 0.5-2.8%, Mg: 0.5-2.8%, and a remainder of Zn and inevitable impurities, and a cross-sectional structure of the Zn alloy plating layer includes, by area percentage, more than 50% of a Zn single phase structure and less than 50% of a Zn-Al-Mg-based intermetallic compound. A surface structure of the Zn alloy plating layer includes, by area percentage, 40% or less of a Zn single phase structure and 60% or more of a Zn-Al-Mg-based intermetallic compound.

Description

Technical field [0001] The present invention relates to a galvanized alloy steel sheet with excellent phosphate processability and spot weldability and a manufacturing method thereof. Background technique [0002] In recent years, as the use of galvanized steel sheets has been widely expanded to household appliances and automobiles, the use of coating treatment on galvanized steel sheets has shown an increasing trend, and in order to increase the coating adhesion of galvanized steel sheets, Requires excellent phosphate treatment. However, ordinary galvanized steel sheets usually form zinc crystal grains called spangles when the zinc attached to the surface of the steel sheet solidifies. The spangles also remain on the surface of the steel sheet after solidification, so there is a poor phosphate treatment. Disadvantages. [0003] In order to improve this shortcoming, a coating technology with various additional elements in the coating is proposed. A representative example is a zin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/02C23C2/06C23C2/16C23C2/28C23C2/40
CPCC23C2/02C23C2/06C23C2/16C23C2/28C23C2/40C23C2/261C23C2/024C23C2/29C23C2/022C22C18/04
Inventor 吴旻锡金相宪金泰喆金钟常柳凤桓尹现柱
Owner POSCO CO LTD
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