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A kind of preparation method of zn-al-zr-b alloy for hot-dip plating

A hot-dip plating and alloying technology, applied in hot-dip plating process, metal material coating process, coating, etc., can solve problems such as too thick coating, large amount of molten pool slag, affecting product quality, etc., to achieve uniform distribution, The eutectic structure is fine and dense, and the effect of slowing down the exothermic reaction

Active Publication Date: 2016-01-27
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Zinc-aluminum alloy coating has good corrosion resistance. Extensive research has been carried out at home and abroad, and a variety of alloy coatings have been developed; among them, Galvalume alloy coating is the most widely used, and its composition is Zn-55%Al-1.6%Si, Galvalume alloy coating has good corrosion resistance, and its corrosion resistance is about several times that of ordinary pure Zn coating products. No matter it is outdoors, in a humid environment, or in harsh conditions and environments such as marine climates, Galvalume alloy coatings are better than Zn coatings. The corrosion resistance of ordinary galvanizing is superior, but there are some problems in the Galvalume alloy coating, such as: the coating is too thick and the amount of slag in the molten pool is too much, which seriously affects the product quality

Method used

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  • A kind of preparation method of zn-al-zr-b alloy for hot-dip plating
  • A kind of preparation method of zn-al-zr-b alloy for hot-dip plating
  • A kind of preparation method of zn-al-zr-b alloy for hot-dip plating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh the Zn block, Al block, and Al-10Zr master alloy in proportion. The composition of the alloy is: Al30%, Zr0.5%, and the balance is Zn;

[0029] (2) Preheat the graphite crucible to dark red, put the aluminum block and zinc block weighed in proportion into the crucible, and sprinkle the salt covering agent on the surface of the aluminum block and zinc block, and then raise the temperature to 720°C;

[0030] (3) After the aluminum block and the zinc block are completely melted, add the Al-10Zr master alloy, and stir evenly after the Al-10Zr master alloy is melted;

[0031] (4) cooling the molten alloy to 650°C with the furnace for refining and slag removal;

[0032] (5) Cool down to 550°C with the furnace for slag removal and casting.

[0033] The scanning electron micrograph of the Zn-30%Al-0.5%Zr alloy used for hot-dip plating obtained by the above steps is as follows figure 1 As shown in (1), it can be seen that the matrix structure of the alloy is a Zn / Al / ...

Embodiment 2

[0035] (1) weigh Zn block, Al block, Al-10Zr master alloy in proportion, by mass percentage, the composition of alloy is: Al30%, Zr1%, surplus is Zn;

[0036](2) Preheat the graphite crucible to dark red, put the aluminum block and zinc block weighed in proportion into the crucible, and sprinkle the salt covering agent on the surface of the aluminum block and zinc block, and then raise the temperature to 720°C;

[0037] (3) After the aluminum block and the zinc block are completely melted, add the Al-10Zr master alloy, and stir evenly after the Al-10Zr master alloy is melted;

[0038] (4) cooling the molten alloy to 650°C with the furnace for refining and slag removal;

[0039] (5) Cool down to 550°C with the furnace for slag removal and casting.

[0040] The scanning electron micrograph of the Zn-30%Al-1%Zr alloy used for hot-dip plating obtained by the above steps is as follows figure 1 As shown in (2), it can be seen that the matrix structure of the alloy is a Zn / Al / ZnAlZ...

Embodiment 3

[0042] (1) Weigh Zn block, Al block, Al-10Zr master alloy, Al-16B master alloy in proportion;

[0043] (2) Preheat the graphite crucible to dark red, put the aluminum block and zinc block weighed in proportion into the crucible, and sprinkle the salt covering agent on the surface of the aluminum block and zinc block, and then raise the temperature to 720°C;

[0044] (3) After the aluminum block and the zinc block are completely melted, add the Al-10Zr master alloy, and stir evenly after the Al-10Zr master alloy is melted;

[0045] (4) Press the Al-16B master alloy into the alloy liquid, and sprinkle a salt covering agent on the surface of the molten liquid, subject to covering the surface of the molten liquid;

[0046] (5) After complete melting, stir the alloy liquid evenly and cool down to 650°C with the furnace for refining and slag removal;

[0047] (6) The alloy liquid is cooled to 550°C with the furnace for slag removal and casting.

[0048] The scanning electron micro...

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Abstract

The invention belongs to the technical field of hot-dip galvanizing, and particularly relates to a zn-Al-Zr-B alloy for hot dipping and a preparation method thereof. The alloy is characterized in that the content of Al is controlled at 30wt%, the content of Zr is controlled within 0.5-1.5wt%, the content of B is controlled within 0.5-1.5wt%, with the balance of Zn. According to the scheme provided by the invention, on the one hand, generation of bottom residues is effectively reduced by controlling the content of Al at 30wt% and slowing down the heat releasing reaction between Fe and Al, so that the production efficiency is improved; on the other hand, the eutectic structure in the galvanized alloy is refined by adding Zr and B, so that the corrosion resistance of the galvanized alloy is improved under a condition that the production cost is not greatly increased. Meanwhile, the surface quality of the plated layer is improved. The alloy can be applied to hot dipping production processes of parts with higher demands on corrosion resistance and appearance quality.

Description

technical field [0001] The patent of the invention belongs to the technical field of hot-dip galvanizing, and particularly refers to a Zn-Al-Zr-B alloy for hot-dip galvanizing and a preparation method thereof. Background technique [0002] Hot-dip galvanized and zinc alloy products are now widely used in household appliances, construction, container manufacturing, vehicles and ships and other industries. In recent years, the global demand for galvanized steel sheets has been increasing, and the output has also increased rapidly; however, due to the long-term exposure of steel products to the external environment, corrosion is extremely prone to occur, resulting in damage and failure of steel products, which brings great harm to human production and life. Corrosion is a very common phenomenon in nature and cannot be avoided; according to statistics, the metal products scrapped due to corrosion problems in the world every year is equivalent to about 1% of the global annual out...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06
Inventor 王建华潘修河涂浩苏旭平彭浩平刘亚
Owner CHANGZHOU UNIV