Zn-Al-Mg hot-dip steel plate with high corrosion resistance, and production method thereof

A production method and hot-dip plating technology, applied in hot-dip plating process, coating, metal material coating process, etc., can solve the problems of insufficient welding performance and appearance of coating, easy damage of equipment, and high dipping temperature. Achieve the effect of improving hardness, improving corrosion resistance and good surface quality

Active Publication Date: 2019-03-29
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Studies have found that adding alloy elements to the coating can effectively improve the corrosion resistance of the product, and a variety of new corrosion-resistant coating products have also been developed internationally, such as Galvalume (55%Al-43.4%Zn-1.6%Si), its corrosion resistance The performance can reach 2 to 6 times that of ordinary pure galvanized sheet, but its immersion temperature is high, energy consumptio

Method used

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  • Zn-Al-Mg hot-dip steel plate with high corrosion resistance, and production method thereof
  • Zn-Al-Mg hot-dip steel plate with high corrosion resistance, and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: The high-corrosion-resistant zinc-aluminum-magnesium hot-dip coated steel sheet and its production method are specifically described as follows.

[0023] Plating solution composition (wt): Al 1.8%, Mg 1.5%, Re 0.01%, Cu 0.003%, the rest is Zn and other uncontrollable impurities; among them, Cu is added to the plating solution in the form of 60nm nano-copper when the plating solution melts .

[0024] Production process: the annealing temperature is 680°C; the dew point of the furnace nose is -10°C, the hot-dip plating temperature is 420°C, and the dipping time is 2 seconds; the cooling after plating is segmental cooling, and the temperature of the board surface is used as the control amount to adjust the opening of the fan; 10°C / S rapid cooling above 400°C, 3°C / S slow cooling from 400°C to 350°C, and 10°C / S rapid cooling below 350°C; the flattening elongation of the flattening process is 0.5%.

[0025] tested by figure 1 Visible, the organization of this ...

Embodiment 2

[0026] Embodiment 2: The high-corrosion-resistant zinc-aluminum-magnesium hot-dipped steel sheet and its production method are specifically described as follows.

[0027] Plating solution composition (wt): Al 1.9%, Mg 1.2%, Re 0.03%, Cu 0.004%, the rest is Zn and other uncontrollable impurities; among them, Cu is added to the plating solution in the form of 80nm nano-copper when the plating solution melts .

[0028] Production process: the annealing temperature is 690°C; the dew point of the furnace nose is -12°C; the hot-dip plating temperature is 430°C; Above 400°C is 14°C / S rapid cooling, 400°C~350°C is 3°C / S slow cooling, below 350°C is 12°C / S rapid cooling; flat elongation is 0.7%.

[0029] After testing, the structure of the coating obtained by this method is primary zinc, Zn / MgZn 2 Binary eutectic, Zn / Al / MgZn 2 Ternary eutectic and nano-copper; the coating hardness of the obtained steel plate and the red rust time in the salt spray test are shown in Table 1.

Embodiment 3

[0030] Embodiment 3: The high-corrosion-resistant zinc-aluminum-magnesium hot-dipped steel sheet and its production method are specifically described as follows.

[0031] Plating solution composition (wt): Al 2.0%, Mg 1.6%, Re 0.07%, Cu 0.008%, the rest is Zn and other uncontrollable impurities; among them, Cu is added to the plating solution in the form of 20nm nano-copper when the plating solution melts .

[0032] Production process: the annealing temperature is 710°C; the dew point of the furnace nose is -18°C; the hot-dip plating temperature is 440°C; Above 400°C is 20°C / S rapid cooling, 400°C-350°C is 5°C / S slow cooling, below 350°C is 16°C / S rapid cooling; flat elongation is 0.9%.

[0033] After testing, the structure of the coating obtained by this method is primary zinc, Zn / MgZn 2 Binary eutectic, Zn / Al / MgZn 2 Ternary eutectic and nano-copper; the coating hardness of the obtained steel plate and the red rust time in the salt spray test are shown in Table 1.

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Abstract

The invention discloses a Zn-Al-Mg hot-dip steel plate with high corrosion resistance, and a production method thereof. The Zn-Al-Mg hot-dip steel plate comprises a baseplate and a coating on the baseplate, and is characterized in that the chemical components of the coating comprise, by mass, 1.8%-2.3% of Al, 1.2%-1.8% of Mg, 0.01%-0.08% of Re, 0.003%-0.008% of Cu and the balance Zn and other inevitable impurities, wherein the Cu is added to plating solutions in a nanometer form during melting of the plating solutions. The Cu in the coating of the steel plate is added in a nano-copper form during melting of the plating solutions; since the temperature of Zn liquid is lower during adding of the Cu, the shape of Cu particles can be ensured; by taking advantage of the characteristic of fine dispersion of the Cu particles, the Cu particles play a role in strengthening of precipitation, so that the hardness of the coating is improved; and by adding of rare earth Re, the coating structure can be fined, and the fluidity of the plating solutions is improved, so that the corrosion resistance of the coating can be improved effectively. The coating structure of a product obtained with the method is primary Zn, Zn/MgZn2 binary eutectic, Zn/Al/MgZn2 ternary eutectic and nano-copper; and the corrosion resistance is equal to 10-15 times the corrosion resistance of a pure zinc plate of the same thickness.

Description

technical field [0001] The invention relates to a coated steel plate, in particular to a high-corrosion-resistant zinc-aluminum-magnesium hot-dipped steel plate and a production method thereof. Background technique [0002] Steel is the largest and most widely used metal material in the world. It has a variety of excellent properties, such as: good toughness, high strength, and high cost performance; but it also has some shortcomings, the most prominent of which is that it is easily eroded by air at low temperature and humidity, and easily eroded by air at high temperature. It is oxidized by oxygen and suffers from problems such as accelerated corrosion rate in acidic environment. Therefore, the problem of anti-corrosion of steel is very important, and metal anti-corrosion technology has always been a major research topic in the field of metal materials. [0003] The commonly used protective methods include galvanizing and painting, but the industry urgently needs a new ty...

Claims

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Application Information

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IPC IPC(8): C23C2/06C22C18/04C23C2/40
CPCC22C18/04C23C2/06C23C2/40
Inventor 李建新张鹏孙力杨丽芳梅淑文弓俊杰杨士宏梁媛媛
Owner HEBEI IRON AND STEEL
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