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Hot-dip galvanized aluminum-magnesium alloy coated steel plate and preparation method

A technology of aluminum-magnesium alloy and coated steel plate, applied in heat treatment equipment, hot-dip coating process, metal material coating process, etc., can solve the problems of backward technology and late production start, and achieve good surface quality and mechanical properties, excellent durability The effect of corrosion performance

Pending Publication Date: 2021-12-03
TIANJIN ROLLING ONE STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, foreign steel companies such as Nippon Steel, ArcelorMittal, and ThyssenKrupp have developed zinc-aluminum-magnesium-coated steel sheets with different compositions. However, due to technical barriers, domestic production of zinc-aluminum-magnesium alloy-coated steel sheets Late start, backward technology, needs continuous improvement

Method used

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  • Hot-dip galvanized aluminum-magnesium alloy coated steel plate and preparation method
  • Hot-dip galvanized aluminum-magnesium alloy coated steel plate and preparation method
  • Hot-dip galvanized aluminum-magnesium alloy coated steel plate and preparation method

Examples

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preparation example Construction

[0037] A method for preparing a hot-dip galvanized aluminum-magnesium alloy coated steel plate, characterized in that: the steps of the method are:

[0038] S1, the steel plate after cold rolling is carried out chemical degreasing treatment, obtains the steel plate with clean surface, and the surface roughness of steel plate is 0.5~1.5 μ m, and plate shape I-Unit is less than 15;

[0039] S2, heat-treating the steel plate in step S1 to obtain a heat-treated steel plate;

[0040] S3, the heat-treated steel plate is sequentially subjected to hot-dip plating, air knife purging, and cooling to obtain a zinc-aluminum-magnesium alloy coated steel plate;

[0041] S4, the zinc-aluminum-magnesium alloy-coated steel sheet is subjected to skinning and stretching and straightening in sequence to obtain a zinc-aluminum-magnesium alloy-coated steel sheet with excellent surface quality and plate shape;

[0042] S5, carrying out environmental protection passivation and anti-fingerprint post-...

Embodiment 11

[0070] When the sample of Example 11 (Zn-1.8Al-0.9Mg-0.05Si-Mn (trace amount)) was subjected to accelerated corrosion in the salt spray test chamber for 480 hours, part of the white rust appeared on the edge, and when it was 600 hours, the area of ​​the white rust expanded, and the plate Slight white rust appeared on the surface, and light and heavy red rust appeared on the edge at 2040h. Until the end of the test at 2160h, no large area of ​​white rust appeared on the surface of the sample. It can be seen from Table 2 that the samples of other examples show the same or even better corrosion resistance in the salt spray test.

[0071] figure 1 It is the SEM scanning electron microscope interface diagram of Example 11, magnification: 3000×, high voltage: 15.0 kV. figure 2 It is the cross-sectional chemical composition analysis diagram of Example 11, high voltage: 15.0kV, pulse: 0.49kcps. image 3 It is the cross-sectional element distribution diagram of Example 11, magnific...

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Abstract

The invention relates to a hot-dip galvanized aluminum-magnesium alloy coated steel plate and a preparation method. The hot-dip galvanized aluminum-magnesium alloy coated steel plate prepared by the method not only has excellent corrosion resistance, blackening resistance and notch protectiveness, but also has good surface quality and mechanical properties, and can completely meet application in the fields of household appliances, machinery, agriculture, animal husbandry and the like.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanizing, and relates to a hot-dip galvanized aluminum-magnesium alloy coated steel plate and a preparation method thereof. Background technique [0002] Hot-dip galvanizing is one of the anti-corrosion technologies for iron and steel. The alloy layer is formed by the reaction of the molten zinc liquid and the steel substrate, which combines the steel substrate and the coating, and covers the surface of the zinc layer with a dense oxide layer, so that the zinc layer has Good corrosion resistance, at the same time, the zinc layer has the protective effect of sacrificial anode, and also protects the substrate when there are fine cracks in the zinc layer. [0003] However, as people's requirements for corrosion resistance, processability and cut protection of steel coatings continue to increase, pure galvanized coatings can no longer meet the needs of industrial production. In order to improve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C22C18/04C23C2/02C23C2/20C21D1/26C21D9/00C23C2/28C23F17/00
CPCC23C2/06C22C18/04C23C2/02C23C2/20C21D1/26C21D9/0081C23C2/28C23F17/00
Inventor 黄智铭
Owner TIANJIN ROLLING ONE STEEL
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