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Hot-dipping Zn-Al-Mg alloy coating layer steel plate and preparation method thereof

An alloy coating and hot-dip plating technology, applied in hot-dip plating process, metal material coating process, coating and other directions, can solve the problems of difficult production, increased oxidation of the surface of the plating solution, and unfavorable production of zinc-aluminum-magnesium products, etc. To achieve the effect of good surface quality and excellent corrosion resistance

Pending Publication Date: 2020-06-12
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the trial production results show that the production difficulty of hot-dip Zn-Al-Mg coating is greater than that of pure zinc coating, mainly in the increase of oxidation on the surface of the plating solution and the increase of surface defects in the coating, etc.
Therefore, in order to ensure that the surface of the plating solution is not covered by oxides and improve the surface quality, it is generally necessary to use N 2 air knife, but this is not only not conducive to the production of zinc, aluminum and magnesium products on the air knife galvanizing line, but also causes N 2 waste, increasing production costs

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  • Hot-dipping Zn-Al-Mg alloy coating layer steel plate and preparation method thereof

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preparation example Construction

[0030] The present invention also provides a method for preparing the above-mentioned hot-dip Zn-Al-Mg alloy-coated steel sheet, which mainly includes the steps of degreasing cleaning, continuous annealing, hot-dip plating, air knife purging, cooling, skinning, surface treatment, and coiling.

[0031] Wherein, the degreasing cleaning mainly includes the steps of degreasing in the lye tank and the electrolytic tank, and then cleaning in the rinsing tank.

[0032] In order to effectively clean residues such as grease on the surface of the strip steel and the residual lye on the surface of the strip steel during the rinsing process, and to save production costs, the present invention can control the temperature of the lye in the lye tank to 60-90°C. The liquid concentration is controlled at 70-90 points, the electrolytic current of the electrolytic tank is controlled at 6000-8000A, the alkalinity of the rinsing tank is ≤8 points, and the drying temperature of the strip steel is ≥1...

Embodiment 1

[0048] The hot-dip Zn-Al-Mg alloy coated steel plate of the present embodiment has a coating weight of 80g / m 2 (double-sided), the main components of the coating are: aluminum 1.3%, magnesium 1.8%, lead 0.002%, antimony 0.002%, silicon 0.003%, tin 0.001%, and the rest is zinc.

[0049] The preparation method of the hot-dip Zn-Al-Mg alloy-coated steel plate in this embodiment is as follows: in the degreasing and cleaning process, the temperature of the bath solution needs to be controlled at 75°C, the concentration of the alkali solution in the degreasing tank is 75 points, the electrolytic current is 7500A, and the alkali solution in the cleaning tank is 6 points, the drying temperature of the strip is 125°C; in the continuous annealing process, the hydrogen in the furnace is 4.8%, and the temperature of the zinc pot is 400°C; in the hot dip plating process, the bath temperature is 390°C, and the bath composition is aluminum 1.3 %, magnesium 1.8%, the sum of unavoidable impuri...

Embodiment 2

[0052] The hot-dip Zn-Al-Mg alloy coated steel plate of the present embodiment has a coating weight of 100g / m 2 (double-sided), the main components of the coating are: aluminum 1.9%, magnesium 1.3%, lead 0.003%, antimony 0.002%, silicon 0.004%, tin 0.001%, and the rest is zinc.

[0053] The preparation method of the hot-dip Zn-Al-Mg alloy-coated steel plate in this embodiment is as follows: in the degreasing and cleaning process, the temperature of the bath solution needs to be controlled at 65°C, the concentration of the alkali solution in the degreasing tank is 70 points, the electrolytic current is 7000A, and the alkali solution in the cleaning tank is 8 points, the drying temperature of the strip is 105°C; in the continuous annealing process, the hydrogen in the furnace is 3.9%, and the temperature of the zinc pot is 455°C; %, magnesium 1.3%, the sum of unavoidable impurities 0.014%, of which lead 0.003%, antimony 0.002%, silicon 0.004%, tin 0.001%, and the rest is zinc; i...

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Abstract

The invention relates to a hot-dipping Zn-Al-Mg alloy coating layer steel plate and a preparation method thereof, and belongs to the technical field of hot dipping. According to the hot-dipping Zn-Al-Mg alloy coating layer steel plate provided by the invention, a coating is prepared from the chemical components: 1.0 to 2.5 percent of aluminum, 1.1 to 2.8 percent of magnesium, less than or equal to0.015 percent of inevitable impurities, and the balance zin, wherein the weight ratio of Mg to Al is equal to 0.5 to 1.2. The preparation method comprises the steps of degreasing, cleaning, continuously annealing, hot dipping, purging through an air knife, cooling, finishing, carrying out surface treatment, and coiling. The hot-dipping Zn-Al-Mg alloy coating layer steel plate has excellent corrosion resistance, formability and coating performance, has favorable surface quality without adopting an N2 air knife, can be used as an inner part for a home appliance after being punched and formed, can be further applied to an outer part for the home appliance after being sprayed, and completely meets the use demands of home appliance users.

Description

technical field [0001] The invention belongs to the technical field of hot-dip plating, and in particular relates to a hot-dip Zn-Al-Mg alloy coated steel plate and a preparation method thereof. Background technique [0002] The improvement of corrosion resistance is the main goal of continuous pursuit of coated steel sheets. As the user market has higher and higher requirements for material corrosion resistance, hot-dip galvanizing (GI) and hot-dip 55% Al-Zn alloy coating (GL) are widely used in construction, automobile and home appliance manufacturing industries all over the world. ) steel plate and so on belong to the "traditional" coated steel plate, and users expect to develop a coated steel plate with better performance. The hot-dip Zn-Al-Mg alloy coated steel plate is a new type of coated steel plate that emerges at the historic moment. [0003] Zn-Al-Mg alloy coating attracted widespread attention abroad in the 1980s, and became the focus of research in the profess...

Claims

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Application Information

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IPC IPC(8): C23C2/06C22C18/00C22C18/04C23C2/02C23C2/20C23C2/26
CPCC22C18/00C22C18/04C23C2/02C23C2/06C23C2/20C23C2/26
Inventor 董学强郭太雄金永清冉长荣
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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