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Composite zinc-aluminum alloy coating material and hot-dip coating method

A zinc-aluminum alloy and hot-dip coating technology, which is applied in the field of metal materials and their coating processes, hot-dip coating materials and their alloy coating preparation, can solve the problems of poor corrosion resistance of low-aluminum zinc-rich alloys and decreased corrosion resistance of coatings, etc. , to achieve the effect of improving corrosion resistance, smooth surface and grain refinement

Inactive Publication Date: 2019-08-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems of the prior art, the object of the present invention is to overcome the deficiencies in the prior art, and provide a composite zinc-aluminum alloy coating material and a hot-dip coating method. On the basis of a low-aluminum zinc-rich alloy, Mg element or Adding Mg and Ti alloy elements at the same time can not only solve the problem that the corrosion resistance of the coating is reduced, but also improve the surface quality of the coating and provide the preparation process parameters. Therefore, the hot-dip Zn-Al-Si-Mg coating of the present invention is adopted Alloy coating or hot-dip Zn-Al-Si-Mg-Ti alloy coating has excellent comprehensive properties
The invention solves the problem of poor corrosion resistance of low-aluminum-zinc-rich alloys. By adding alloy elements Mg and Ti, the structure of the coating is changed, and finally the corrosion resistance of the coating is improved and the surface quality of the product is improved.

Method used

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  • Composite zinc-aluminum alloy coating material and hot-dip coating method

Examples

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Effect test

Embodiment 1

[0047] In this example, see figure 1 , image 3 , Figure 4 and Image 6 , a composite zinc-aluminum alloy coating material, has the following main element composition and its weight percentage: the content of Al is 22.3wt.%, the content of Si is 0.3wt.%, the content of Mg is 1.5wt.%, and the rest is Zn, A Zn-Al-Si-Mg coating material is formed.

[0048] This embodiment is a hot-dip coating method for a composite zinc-aluminum alloy coating material that can reduce the amount of hot-dip aluminum-zinc bottom slag and improve the surface quality of the coating. This embodiment adopts a self-developed continuous hot-dip simulation device to prepare a hot Dip-plating Al-Zn-Si-Mg coated steel plate, comprises the steps:

[0049] a. Preparation process of hot-plating solution:

[0050] 1) Weighing and preparing raw materials according to the following elemental compositions and weight percentages required for preparing the composite zinc-aluminum alloy coating material: the con...

Embodiment 2

[0068] This embodiment is basically the same as Embodiment 1, especially in that:

[0069] In this example, see Figure 2~4 , a composite zinc-aluminum alloy coating material, has the following main element composition and its weight percentage: the content of Al is 22.3wt.%, the content of Si is 0.3wt.%, the content of Mg is 3wt.%, and the rest is Zn, forming Zn-Al-Si-Mg coating material.

[0070] In this embodiment, a hot-dip coating method for a composite zinc-aluminum alloy coating material that can reduce the amount of hot-dip aluminum-zinc bottom slag and improve the surface quality of the coating uses a self-developed continuous hot-dip simulation device to prepare hot-dip Al -Zn-Si-Mg coated steel plate, comprising the steps of:

[0071] a. Preparation process of hot-plating solution:

[0072] 1) Weigh the prepared raw materials according to the following elemental compositions and weight percentages required for preparing the composite zinc-aluminum alloy coating m...

Embodiment 3

[0091] This embodiment is basically the same as the previous embodiment, and the special features are:

[0092] In this embodiment, a composite zinc-aluminum alloy coating material has the following main element composition and weight percentage: the content of Al is 22.3wt.%, the content of Si is 0.3wt.%, and the content of Mg is 3wt.%. The content of Ti is 0.05%, and the rest is Zn, forming a Zn-Al-Si-Mg-Ti coating material.

[0093] In this example, a hot-dip coating method for a composite zinc-aluminum alloy coating material that can reduce the amount of hot-dip aluminum-zinc bottom slag and improve the surface quality of the coating, adopts a self-developed continuous hot-dip simulation device to prepare a hot-dip Zn coating. -Al-Si-Mg-Ti coated steel plate, comprising the steps of:

[0094] a. Preparation process of hot-plating solution:

[0095] 1) Weigh and prepare the raw materials according to the following elemental compositions and weight percentages required for...

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Abstract

The invention discloses a composite zinc-aluminum alloy coating material and a hot-dip plating method. A eutectoid composition Zn-Al-Si-Mg-Ti alloy coating for hot-dip plating is prepared and comprises, by mass percentage, 10-30% of Al, 0.1-1% of Si, 0.04-1% of Ti, not larger than 5% of Mg and the balance Zn. A plating solution alloy is melted through a molten salt covering method; a part to be electroplated is put into a zinc pot and pre-reduced in hydrogen-nitrogen mixed gas with the reducing atmosphere of 5-50%, the reducing temperature ranges from 500 DEG C to 680 DEG C, the preheating time ranges from 3 min to 10 min, the zinc pot temperature is controlled within the range of 550-640 DEG C, and the dip plating time is controlled within the range of 3s-30min; and after a plate is taken out of the zinc pot, the thickness of the coating is controlled through an air knife, meanwhile the coating is cooled, and the expected hot-dip plating plate is obtained. By the adoption of the composite zinc-aluminum alloy coating material and the hot-dip plating method, the obtained coating is level in surface, and the amount of bottom slag in a plating solution is small.

Description

technical field [0001] The invention relates to a metal material and a coating process thereof, in particular to a hot-dip coating material and an alloy coating preparation method thereof, which are applied in the technical field of hot-dip coating technology. Background technique [0002] The hot-dip galvanized aluminum coating combines the durable protection of aluminum and the anodic protection of zinc. It not only has longer atmospheric corrosion resistance, but also has better coating performance and better resistance to high temperature oxidation. [0003] Hot-dip galvanizing is widely used in bridges, building steel structures, automobiles, mining machinery and shipbuilding industries. At present, the relatively mature aluminum-zinc alloy coatings mainly include Galvalume of Bethlehem Iron and Steel Company, Galfan of World Lead and Zinc Association, and Nippon Iron and Steel Company. Among them, high-aluminum Galvalume is the most common, but in the process of hot-di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C18/04C22C1/03C23C2/06C23C2/16
CPCC22C1/03C22C18/04C23C2/06C23C2/16
Inventor 吴广新彭望君张捷宇杨志良丁德建
Owner SHANGHAI UNIV