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Hot-dip galvanized coated steel sheet and preparation method thereof

A technology of coated steel sheet and hot-dip galvanizing, which is applied in hot-dip galvanizing process, coating, metal material coating process, etc., and can solve the problem that the corrosion resistance and coating thickness cannot be balanced.

Pending Publication Date: 2022-04-19
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a hot-dip galvanized coated steel sheet and its preparation method to solve the technical problem in the prior art that the corrosion resistance of the zinc-aluminum-magnesium coated steel sheet cannot be balanced with the thickness of the coating

Method used

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  • Hot-dip galvanized coated steel sheet and preparation method thereof
  • Hot-dip galvanized coated steel sheet and preparation method thereof
  • Hot-dip galvanized coated steel sheet and preparation method thereof

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preparation example Construction

[0048] Second aspect, such as figure 2 Shown, the application provides a kind of preparation method of hot-dip galvanized steel plate, and described preparation method comprises:

[0049] S1. Obtain a plating solution containing the chemical composition of the coating;

[0050] S2. heating the plating solution to obtain a preheated plating solution;

[0051] S3. Obtain a steel plate containing the chemical composition of the steel matrix;

[0052] S4. Heating the steel plate, and then immersing it in the preheated plating solution, so that the plating solution covers the steel plate to form a coating, and after cooling, the steel plate of the layer is obtained.

[0053] As an optional embodiment, the temperature of the preheated plating solution is within 400°C-480°C.

[0054] In this application, the effect of limiting the temperature of the preheating bath to 400°C-480°C is that the temperature of the bath reaches the temperature range capable of reacting with the steel ...

Embodiment 1

[0067] Select a 2mm steel plate, the chemical composition of the steel matrix includes: C: 0.05%, Mn: 0.02%, Si: 0.3%, Cr: 0.02%, B: 0.0001%, Al: 0.05% in terms of mass fraction;

[0068] The chemical composition of the coating includes: Mg: 1%, Al: 5%, rare earth elements: 0.02%, and the rest is Zn and unavoidable impurities in terms of mass fraction;

[0069] Among the rare earth elements, the mass fraction of La is 0%, the mass fraction of Ce is 0%, the mass fraction of Er is 0.02%, and the mass fraction of Y is 0%;

[0070] The equivalent diameter of the aluminum-rich phase is 5 μm;

[0071] In the preparation method, the temperature of the preheating bath is 480°C;

[0072] In heating the steel plate, the heating temperature is controlled to be 10°C lower than the temperature of the preheated plating solution, so the heating temperature is 470°C;

[0073] In heating the steel plate, the atmosphere temperature at the leakage point is -40°C;

[0074] The average surface ro...

Embodiment 2

[0076] Select a 2.4mm steel plate, the chemical composition of the steel matrix includes: C: 0.1%, Mn: 0.8%, Si: 0.4%, Cr: 0.1%, B: 0.0004%, Al: 0.4% in terms of mass fraction;

[0077] The chemical composition of the coating includes: Mg: 1%, Al: 6%, rare earth elements: 0.101%, and the rest is Zn and unavoidable impurities in terms of mass fraction;

[0078] Among the rare earth elements, the mass fraction of La is 0%, the mass fraction of Ce is 0.001%, the mass fraction of Er is 0%, and the mass fraction of Y is 0.1%;

[0079] The equivalent diameter of the aluminum-rich phase is 5 μm;

[0080] In the preparation method, the temperature of the preheating bath is 425°C;

[0081] In heating the steel plate, the heating temperature is controlled to be 15°C lower than the temperature of the preheated plating solution, so the heating temperature is 410°C;

[0082] In heating the steel plate, the atmosphere temperature at the leakage point is -50°C;

[0083] The surface averag...

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Abstract

The invention relates to the field of steel coating and plating preparation, in particular to a hot-dip galvanizing coated steel plate and a preparation method thereof, and the coated steel plate comprises a steel substrate and a coating; the steel matrix comprises the following components in percentage by weight: 0.01%-0.2% of C, 0.01%-2% of Mn, 0.01%-0.4% of Si, 0.02%-0.4% of Cr, 0.0001%-0.001% of B and 0.03%-0.6% of Al; the plating layer comprises 1-4% of Mg, 5-8% of Al, less than or equal to 1% of rare earth elements and the balance of Zn and inevitable impurities; the preparation method comprises the following steps: obtaining a plating solution containing chemical components of the plating layer; heating the plating solution to obtain a preheated plating solution; obtaining a steel plate containing the chemical components of the steel substrate; heating the steel plate, immersing the steel plate in the preheating plating solution, and cooling to obtain the plated steel plate, by controlling the chemical components of the steel substrate and the plating layer and then through the preparation method, balance control over the corrosion resistance and the plating layer thickness of the plated steel plate is achieved.

Description

technical field [0001] The present application relates to the field of steel coating preparation, in particular to a hot-dip galvanized steel sheet and a preparation method thereof. Background technique [0002] When the traditional continuous hot-dip galvanized steel sheet is applied to the manufacture of complex steel structure parts, there will be exposed cuts, and corrosion will occur preferentially at the cut positions. [0003] The zinc-aluminum-magnesium coating has excellent incision corrosion resistance. At present, most of the hot-dip galvanizing technology in the manufacture of steel structure parts uses zinc-aluminum-magnesium coating. The thickness range of commonly used steel structure parts is usually 2.0-10.0mm, with 3.0 The thickness of -4.0mm is mostly, so the thickness of the zinc-aluminum-magnesium coating needs to reach more than 20μm, and during the solidification process of the hot-dip coating product, the over-thick coating will show a significant thi...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/40C22C38/02C22C38/04C22C38/06C22C38/38C22C38/32C22C18/04
CPCC23C2/06C23C2/40C22C38/02C22C38/04C22C38/06C22C38/38C22C38/32C22C18/04
Inventor 蒋光锐李研王海全刘广会商婷刘武华滕华湘齐志坤王保勇王松涛徐呈亮
Owner SHOUGANG CORPORATION
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