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Hot dipping covering agent

A covering agent and hot-dip coating technology, applied in hot-dip coating process, coating, metal material coating process, etc., can solve the problem of affecting the quality of alloy coating and the life of alloy liquid, high hot-dip coating temperature, and degradation of coating quality, etc. problems, to achieve the effect of simple preparation and application method, wide application range and improved surface quality

Inactive Publication Date: 2012-08-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the content of Al increases, a large amount of slag will be produced when the Zn-Al alloy is hot-dip, which will cause the alloy to be oxidized and then lost. large amount of energy
[0003] Existing covering agents, such as the NaCl-KCl system for pure aluminum and aluminum alloy plating, have a mass ratio of 1:1 and a melting point of 650°C, which is close to the melting point of zinc-aluminum alloys and zinc alloys, so it is not suitable for hot-dip galvanizing Aluminum alloy and zinc alloy, narrow scope of application; other covering salts, such as LiCl-NaCl or ZnCl 2 -NaCl system, although the melting points are 352°C and 365°C respectively, it is suitable for hot-dip galvanized aluminum alloy and zinc alloy, but there is a problem that the covering agent reacts with the alloy liquid and causes the loss of the alloy liquid
[0004] In addition, the traditional covering agent forms a large amount of slag in hot-dip galvanized aluminum alloy, zinc alloy and aluminum alloy, which is mainly composed of Al 2 o 3 , ZnO, Fe 2 al 5 、FeAl 3 , FeZn 7 This kind of slag affects the quality of the alloy coating and the life of the alloy liquid. Therefore, it is a challenge in the field of hot dip coating technology to find a covering salt that does not lose the alloy composition and has a wide range of applications, and does not react with the alloy liquid to form slag.

Method used

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: will be 5% KF by mass percentage, 15% LiCl, 30% KCl, 10% ZnCl 2 , 40% NaAlF 6 Mix and grind with a mortar until the particle size is not greater than 2mm, then dry in an oven at 120°C for 30 minutes to complete the preparation of the covering agent; the prepared covering agent has a melting point of 440°C and a density of 1.5765 g / cm 3 ;

[0026] After the alloy is melted, put in the covering agent; apply the above covering agent to hot-dip Zn-5%Al, Zn-55%Al, and pure Al respectively. The effect of covering agent is shown in Table 1:

[0027] Table 1 Covering salt effect of hot-dip galvanized aluminum alloy and aluminum alloy

[0028] alloy composition Hot-dip plating temperature / ℃ Phenomenon Zn-5%Al 470～530 After 4 hours, the covering agent does not agglomerate, has little slag, does not volatilize, and the coating shows good quality Zn-55%Al 580～650 After 4 hours, the covering agent does not agglomerate, has li...

Embodiment 2

[0030] Embodiment 2: will be 15% KF by mass percentage, 25% LiCl, 20% KCl, 5% ZnCl 2 , 35% NaAlF 6 Mix and grind with a mortar until the particle size is not greater than 2mm, and then dry in an oven at 120°C for 30 minutes to complete the preparation of the covering agent. The prepared covering agent has a melting point of 460°C and a density of 2.1207 g / cm 3 ;

[0031] Apply the above covering agents to hot-dip Zn-5%Al, Zn-55%Al, and pure Al respectively. The effects of the covering agents are shown in Table 2:

[0032] Table 2 Covering salt effect of hot-dip galvanized aluminum alloy and aluminum alloy

[0033] alloy composition Hot-dip plating temperature / ℃ Phenomenon Zn-5%Al 470～530 After 4 hours, the covering agent does not agglomerate, has little slag, does not volatilize, and the coating shows good quality Zn-55%Al 580～650 After 4 hours, the covering agent does not agglomerate, has little slag, does not volatilize, and the coating shows ...

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Abstract

The invention relates to the technical field of hot dipping, in particular to a hot dipping covering agent. The hot dipping covering agent comprises the following components in percentage by weight: 5-15 percent of KF, 15-25 percent of LiCl, 20-30 percent of KCl, 5-10 percent of ZnCl2 and 35-40 percent of NaAlF6. The covering agent is prepared by the following steps of: mixing the components according to percentage by mass and grinding the mixture with a mortar until the particle size of the covering agent is less than or equal to 2.0 millimeters; putting the mixture into a baking box; and drying the mixture at the temperature of 120 DEG C for 30 minutes. The particle size of the hot dipping covering agent is less than or equal to 2.0 millimeters, the melting point is between 440 DEG C and 460 DEG C, and the density is between 1.5765 g / cm<3> and 2.1207 g / cm<3>. The hot dipping covering agent is suitable for hot dipping of a zinc high-aluminum alloy, a zinc alloy or an aluminum alloy.

Description

technical field [0001] The invention relates to the technical field of hot-dip plating, in particular to a covering agent for hot-dip plating. Background technique [0002] Hot-dip galvanizing technology is a very effective method for anti-corrosion of steel. Traditional hot-dip anti-corrosion coatings are mainly hot-dip pure Zn and hot-dip pure Al layers. Hot-dip Zn-Al alloy coating is a new technology developed in recent decades. Hot-dip Zn-5Al-RE (Galfan) and Zn-55Al-1.6Si (Galvalume) coatings are typical representatives of hot-dip Zn-Al alloy coatings. They all have good corrosion resistance. As the content of Al increases, a large amount of slag will be produced when the Zn-Al alloy is hot-dip, which will cause the alloy to be oxidized and then lost. Lots of energy. [0003] Existing covering agents, such as the NaCl-KCl system for pure aluminum and aluminum alloy plating, have a mass ratio of 1:1 and a melting point of 650°C, which is close to the melting point of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/30C23C2/06C23C2/12
Inventor 高波胡亮涂赣峰李世伟石为喜郝仪
Owner NORTHEASTERN UNIV LIAONING
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