Al-Zn-Mg-Si alloy for hot dipping steel

A hot-dip plating and alloying technology, which is applied in the hot-dip plating process, metal material coating process, coating, etc., can solve the problem of deteriorating coating surface performance and processing performance, reducing the viscosity of the plating solution, and refining the corrosion resistance of the grain Issues such as insufficient effect

Inactive Publication Date: 2009-06-17
SHANGHAI UNIV
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Problems solved by technology

For example, adding a certain amount of rare earth elements to the plating solution can purify the plating solution, reduce the viscosity of the plating solution and improve the wettability of the plating solution to the steel base, thereby greatly improving the quality of the coating, but the corrosion resistance of the rare earth to the coatin

Method used

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  • Al-Zn-Mg-Si alloy for hot dipping steel
  • Al-Zn-Mg-Si alloy for hot dipping steel
  • Al-Zn-Mg-Si alloy for hot dipping steel

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Embodiment Construction

[0026] Embodiments of the present invention are described as follows in conjunction with accompanying drawings:

[0027] Using a continuous hot-dip galvanizing simulation device (continuous hot-dip galvanizing test line), the surface of the prepared steel plate is attached with Al-Zn-Mg-Si alloy coatings with different composition contents. Plating conditions are as follows:

[0028] Steel plate treatment: take a Q235 steel plate with a size of 100mm×100mm×1mm as a plated piece, degrease and deoxidize it, and then wash it clean.

[0029] Plating solution alloy: within the scope of this patent, the configured alloys for hot-dip plating are shown in Table 1.

[0030] Bath temperature: 580-650°C

[0031] Hot plating time: 10-30 seconds

[0032] Average cooling rate: 25°C / s

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Abstract

The invention provides a rare earth-containing Al-Zn-Mg-Si alloy with high aluminum content for hot-dipping steel products, comprising the following compositions by weight percent as follows; Al: 50-75%, Mg: 1-5%, Si: 0.5-2.5%, the addition of 0.002-0.1% of Ti, 0.001-0.045% of B and 0.05-1% of rare earth (La or Ce), and the balance of Zn and unavoidable impurities. The invention utilizes corrosion resistance of Mg2Si and grain-refining effect of the rare earth, the Ti and the Bi elements to improve quality of plating solution and obtain a high aluminum content aluminum-zinc alloy cladding with ,a bright and smooth surface and great corrosion resistance property. In addition, the content of aluminum in the alloy is up to 50-75%, thereby lowering production cost.

Description

technical field [0001] The invention relates to an Al-Zn-Mg-Si alloy for hot-dipping steel, which can be widely used for steel protection in corrosive environments. Background technique [0002] Steel is easily corroded when exposed to the atmospheric environment. This problem not only brings huge economic losses to the society, but also causes great safety problems due to metal fracture and failure caused by corrosion. Therefore, countries all over the world have conducted extensive research on how to improve the corrosion resistance of steel. [0003] In recent years, the aluminum-zinc alloy hot-dip coating has been developed rapidly. It has been found that adding Mg and rare earth elements to the aluminum-zinc coating can greatly improve the corrosion resistance of the coating. The related products mainly include: Zn-6%Al-3 %Mg, Zn-11%Al-3%Mg-0.2%Si, Zn-0.2%Al-0.5%Mg, Zn-6%Al-3%Mg-RE. It can be found that most of the research on adding Mg and rare earth elements is conc...

Claims

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Application Information

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IPC IPC(8): C22C21/10C23C2/12
CPCC23C2/12
Inventor 李谦赵阳子赵云鹤杨帆张捷宇周国治
Owner SHANGHAI UNIV
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