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Anti-falling and volatilization-resistant Ba-Hf-V Zinc alloy for fastener hot-dip galvanizing

A hot-dip galvanizing, ba-hf-v technology, applied in the field of alloys, can solve the problems of increasing abnormal zinc consumption, small thermal conductivity, uneven thickness of zinc layer, etc., achieve excellent resistance to volatilization and oxidation, reduce Effect of volatilization and oxidation, reduction of heat soaking time

Inactive Publication Date: 2018-08-14
GUANGZHOU YUZHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the small size and irregular shape of the fasteners, and some need thread fit, the traditional hot-dip galvanizing also has the following obvious defects: (1) It is difficult to screw the threads after plating
After hot-dip galvanizing, the remaining zinc sticks to the thread and is not easy to remove, and the thickness of the zinc layer is uneven, which affects the fit of the threaded parts
(2) The high operating temperature of hot-dip galvanizing will reduce the mechanical strength of high-strength fasteners
The strength of some threads of 8.8 bolts after hot-dip galvanizing is lower than the standard requirement; the strength of bolts above 9.8 after hot-dip galvanizing basically cannot meet the requirements
(3) Poor working environment and serious pollution
The volatilization of zinc not only increases the abnormal zinc consumption, but also pollutes the environment
Due to the small thermal conductivity of zinc oxide produced by oxidation on the surface of the zinc liquid, covering the surface of the zinc liquid is equivalent to a heat insulation layer, which makes it more difficult for the heat on the surface to conduct further downwards, resulting in increased energy consumption and a bad atmosphere in the entire working environment.
[0007] Although there are many defects in the hot-dip galvanizing technology, because of its thick coating, good bonding strength and good long-term corrosion effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A Ba-Hf-V zinc alloy used for hot-dip galvanizing of anti-shedding and anti-volatile fasteners at 320-340 degrees. In terms of weight percentage, the chemical composition of the alloy is: Ba: 0.2wt.%, Sc: 0.1wt.%, Hf: 0.4wt.%, Sn: 1.0wt.%, Al: 4.0wt.%, V: 0.2wt .%, the balance is zinc. Alloy preparation method: Add the above-mentioned raw materials into an induction furnace protected by argon gas, and use a silicon carbide crucible; add the above-mentioned raw materials into an atmosphere-protected induction furnace, and use a silicon carbide crucible; induction heating Form the alloy solution at 500-600 degrees, and use the electromagnetic stirring effect to fully stir for about 10 minutes; keep the alloy liquid at 500-600 degrees for 10 minutes, then cast it into the same level equipment as the hot top for semi-continuous casting into the required For round ingots, the ingot moving speed is 5-8m / min. The ingot can be used as raw material for hot-dip galvanizing of b...

Embodiment 2

[0022] A Ba-Hf-V zinc alloy used for hot-dip galvanizing of anti-shedding and anti-volatile fasteners at 320-340 degrees. In terms of weight percentage, the chemical composition of the alloy is: Ba: 0.4wt.%, Sc: 0.2wt.%, Hf: 0.5wt.%, Sn: 3.0wt.%, Al: 6.0wt.%, V: 0.3wt .%, the balance is zinc. Alloy preparation method: Add the above-mentioned raw materials into an induction furnace protected by argon gas, and use a silicon carbide crucible; add the above-mentioned raw materials into an atmosphere-protected induction furnace, and use a silicon carbide crucible; induction heating Form the alloy solution at 500-600 degrees, and use the electromagnetic stirring effect to fully stir for about 10 minutes; keep the alloy liquid at 500-600 degrees for 10 minutes, then cast it into the same level equipment as the hot top for semi-continuous casting into the required For round ingots, the ingot moving speed is 5-8m / min. The ingot can be used as raw material for hot-dip galvanizing of b...

Embodiment 3

[0025] A Ba-Hf-V zinc alloy used for hot-dip galvanizing of anti-shedding and anti-volatile fasteners at 320-340 degrees. In terms of weight percentage, the chemical composition of the alloy is: Ba:0.3wt.%, Sc:0.1wt.%, Hf:0.4wt.%, Sn:1.5wt.%, Al:4.8wt.%, V:0.2wt .%, the balance is zinc. Alloy preparation method: Add the above-mentioned raw materials into an induction furnace protected by argon gas, and use a silicon carbide crucible; add the above-mentioned raw materials into an atmosphere-protected induction furnace, and use a silicon carbide crucible; induction heating Form the alloy solution at 500-600 degrees, and use the electromagnetic stirring effect to fully stir for about 10 minutes; keep the alloy liquid at 500-600 degrees for 10 minutes, then cast it into the same level equipment as the hot top for semi-continuous casting into the required For round ingots, the ingot moving speed is 5-8m / min. The ingot can be used as raw material for hot-dip galvanizing of bolts f...

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Abstract

The invention discloses an anti-falling and volatilization-resistant Ba-Hf-V Zinc alloy for fastener hot-dip galvanizing and a processing technology thereof. The Ba-Hf-V Zinc alloy comprises, by weight, 0.2-0.4wt.% of Ba, 0.1-0.2wt.% of Sc, 0.4-0.5wt.% of Hf, 1.0-3.0wt.% of Sn, 4.0-6.0wt.% of Al, 0.2-0.3wt.% of V and the balance zinc. According to the anti-falling and volatilization-resistant Ba-Hf-V Zinc alloy for fastener hot-dip galvanizing and the processing technology thereof, the alloy is used for hot-dip galvanizing treatment of bolts, and uniform hot-dip galvanized layers can be platedon the surfaces of the bolts used at the temperature of 320-340 DEG C within 10-12 seconds; due to the processing temperature and time are reduced, the mechanical property of the bolts is not obvious; and the effects of improving the production efficiency and saving the cost are achieved.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a zinc alloy. Background technique [0002] Due to the instability of its own thermodynamic properties, steel will corrode to varying degrees in the atmosphere, ocean or other media. The steel materials caused by corrosion account for about 20% of the world's total steel production every year in the world. Therefore, the corrosion problem has always been a difficult problem that governments, relevant departments and researchers of various countries pay close attention to. The hot-dip galvanizing process was created for corrosion. Due to the good bonding force between the coating metal and the base metal, as well as good corrosion resistance, decoration and formability, hot-dip galvanizing is widely used in various fields of national economy such as building materials, metallurgy, electric power, automobiles, and transportation. . [0003] Hot-dip galvanizing is also called hot...

Claims

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Application Information

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IPC IPC(8): C22C18/04C22C1/02C23C2/06
CPCC22C18/04C22C1/02C23C2/06
Inventor 杨长江
Owner GUANGZHOU YUZHI TECH CO LTD
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