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Online switching method aluminum-zinc-magnesium coated steel plate and preparation method thereof

A coated steel plate, aluminum-zinc-magnesium technology, applied in the direction of coating, hot-dip coating process, metal material coating process, etc., can solve uneven spangles, corrosion resistance can not meet the strength requirements, and the combination of coating and substrate Low strength and easy to fall off, etc., to achieve good uniformity, reduce the link of zinc extraction, and reduce the effect of common defects

Active Publication Date: 2020-06-12
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface spangles of the current aluminum-zinc-magnesium steel sheets are uneven, the corrosion resistance cannot meet the strength requirements, and the bonding strength between the coating and the substrate is too low and easy to fall off, which is far from meeting the needs of the industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: Preparation of the Al-Zn-Mg coated steel sheet of the present invention

[0046](1) The equipment does not stop, add 2.2 tons of magnesium alloy ingot A to the 90 tons of zinc liquid in the main pot with a temperature of 593 ° C, melt for 72 hours, and obtain the mixed plating solution A; This pre-melting pot is communicated with the main pot, and is used for adding 55 tons of magnesium alloy ingot B and aluminum-zinc ingot (addition amount is to adjust the composition of the main pot plating solution to the following aluminum-zinc-magnesium in the main pot) The composition content percentage of the plating solution), melted for 72 hours, to obtain the mixed plating solution B; after mixing the mixed plating solution A and the mixed plating solution B uniformly, the aluminum-zinc-magnesium plating solution was obtained. Wherein, in terms of mass percentage, the zinc liquid contains: Al 53, Si≤0.2%, the balance being zinc and other unavoidable impurities. ...

Embodiment 2

[0050] Embodiment 2: Preparation of the Al-Zn-Mg coated steel sheet of the present invention

[0051] (1) The equipment does not stop, add 2.2 tons of magnesium alloy ingot A to the 90 tons of zinc liquid in the main pot with a temperature of 597 ° C, melt for 96 hours, and obtain the mixed plating solution A; This pre-melting pot is communicated with the main pot, and is used to add 55 tons of magnesium alloy ingots B and aluminum-zinc ingots (addition amount is to adjust the plating solution to the composition content of the aluminum-zinc-magnesium plating solution described below) in the main pot. ), melted for 96h to obtain the mixed plating solution B; after mixing the mixed plating solution A and the mixed plating solution B uniformly, the aluminum-zinc-magnesium plating solution was obtained. Wherein, in terms of mass percentage, the zinc liquid contains: Al 55, Si≤0.2%, the balance being zinc and other unavoidable impurities. In terms of mass percentage, the aluminu...

Embodiment 3

[0055] Embodiment 3: Preparation of the Al-Zn-Mg coated steel sheet of the present invention

[0056] (1) The equipment does not stop, add 2.2 tons of magnesium alloy ingot A to the 90 tons of zinc liquid in the main pot with a temperature of 592 ° C, and melt for 80 hours to obtain the mixed plating solution A; This pre-melting pot is communicated with the main pot, and is used to add 55 tons of magnesium alloy ingots B and aluminum-zinc ingots (addition amount is to adjust the main pot plating solution composition to the aluminum-zinc-magnesium plating solution described below) in the main pot. percentage of the composition content), melted for 72 hours, to obtain the mixed plating solution B; after mixing the mixed plating solution A and the mixed plating solution B uniformly, the aluminum-zinc-magnesium plating solution was obtained. Wherein, in terms of mass percentage, the zinc liquid contains: Al 53, Si≤0.2%, the balance being zinc and other unavoidable impurities. I...

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PUM

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Abstract

The invention relates to the technical field of hot-dip coating, in particular to an online switching method aluminum-zinc-magnesium coated steel plate and a preparation method thereof. The online switching method aluminum-zinc-magnesium coated steel plate comprises a steel plate substrate and an aluminum-zinc-magnesium coating located on the surface of the steel plate substrate. The online switching method aluminum-zinc-magnesium coated steel plate is characterized in that the aluminum-zinc-magnesium coating comprises, by mass percent, 51-55% of Al, 1.0-1.2% of Mg, 0-0.2% of Si, 0.02-0.05% ofRe and the balance Zn and other inevitable impurities. The preparation method comprises the following steps that the zinc liquid component in a main pot is adjusted to obtain an aluminum-zinc-magnesium plating solution; and a strip steel substrate is put in the aluminum-zinc-magnesium plating solution in the main pot to be subjected to hot-dip coating, and the aluminum-zinc-magnesium coated steelplate is obtained. According to the online switching method aluminum-zinc-magnesium coated steel plate and the preparation method thereof, based on the aluminum-zinc-magnesium plating solution, the components of the plating solution in the main pot are subjected to online switching, related technological parameters are adjusted, the step for extracting zinc liquid from the main pot is omitted, and the obtained aluminum-zinc-magnesium coated steel plate is high in corrosion resistance; and the strength of bonding between the coating and the steel plate substrate is high, the coating is difficult to peel, and the aluminum-zinc-magnesium coated steel plate can adapt to poor working conditions.

Description

technical field [0001] The invention belongs to the technical field of hot-dip plating, and in particular relates to a method for preparing an aluminum-zinc-magnesium coated steel plate by an on-line switching method and a product thereof. Background technique [0002] Al-Zn-Mg alloy coated steel sheet is an emerging environmentally friendly coated steel sheet with great development prospects in the manufacturing industry. The structure is fine, the coating is not easy to fall off, and it can adapt to the extremely harsh working environment. It is mainly used in the fields of photovoltaic industry, high-speed rail, home appliance manufacturing, and large-scale substations. [0003] At present, only a few enterprises in China are producing aluminum-zinc-magnesium steel sheets, and most of them are in the trial production stage, and have not yet mass-produced. However, the surface spangles of the current aluminum-zinc-magnesium steel sheets are uneven, the corrosion resistanc...

Claims

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Application Information

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IPC IPC(8): C23C2/12C23C2/20C23C2/40C22C21/10
CPCC23C2/12C23C2/20C23C2/40C22C21/10
Inventor 沈友林索晋鹏吴辉刘鸿明李文通苏洪林王雅伟晋红革谢超赵俊召
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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