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A kind of plating flux for steel wire hot-dip galvanized aluminum-magnesium alloy

A hot-dip galvanizing and aluminum-magnesium alloy technology, applied in hot-dip galvanizing process, metal material coating process, coating, etc., can solve the difference in the specific surface reaction rate requirements of the fluxing agent, and the fluxing agent cannot meet the requirements of the fluxing The requirements of the coating agent, the poor bonding strength between the coating and the steel wire, etc., to achieve excellent corrosion resistance, low cost, and avoid the effect of coating falling off

Active Publication Date: 2015-09-16
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific analysis is as follows: 1: The speed of the steel member entering the plating solution is not fast, and the requirement for the reaction speed of the plating flux is not high; while the steel wire is generally faster, it needs the plating flux to react quickly when it comes into contact with the alloy solution, so that the alloy solution can be effectively made Effectively react with the substrate to form a stable alloy coating; 2: The specific surface of the steel member and the steel wire are different, so there are differences in the requirements for the specific surface reaction rate of the flux; 3: The relationship between the substrate and the alloy solution during hot dip The scum produced between them has a very obvious effect on the flux, but the scum produced by the steel component substrate and the alloy solution is different from the scum produced by the steel wire substrate and the alloy solution, and the role of the flux is significantly different.
Therefore, the fluxing agent for hot-dip galvanized aluminum-magnesium alloys for steel components cannot meet the requirements of fluxes for steel wire hot-dip galvanized aluminum-magnesium alloys.
Therefore, when the above-mentioned plating flux is used for steel wire hot-dip galvanized aluminum-magnesium alloy, there are deficiencies such as missing plating, poor coating finish, poor bonding strength between the coating and the steel wire.

Method used

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  • A kind of plating flux for steel wire hot-dip galvanized aluminum-magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Hot-dip galvanizing-5% aluminum-1% magnesium alloy flux formulation, the components are as follows:

[0034] 45% ZnCl 2 , 2% NaF, 0.5% CeCl 2 , 4.5% SnCl 2 , 0.5%H 2 o 2 , 0.1% surfactant (fatty alcohol ether sodium sulfate and sodium dodecylsulfonate mixed according to the weight ratio of 1:1), the balance is tap water.

[0035]After degreasing, pickling and alkali cleaning, the steel wire is immersed in the plating flux described at 80°C at a speed of 7.5m / min, dried at 120°C, and then hot dipped in a zinc-aluminum-magnesium alloy solution for 1min. After cooling, the surface of the steel wire has no missing coating, uniform coating and good finish. The thickness of the coating is about 60-90μm. The results of the neutral salt spray test show that the time for rust spots to appear is 430 hours, and the time for rust spots to appear in traditional hot-dip galvanizing is 140 hours. The service life is much higher than that of hot-dip galvanized pure zinc.

Embodiment 2

[0037] Hot-dip galvanizing-5% aluminum-2% magnesium alloy flux formulation, the components are as follows:

[0038] 42% ZnCl 2 , 6% NaF, 1.5% CeCl 2 , 5% SnCl 2 , 1%H 2 o 2 , 0.3% surfactant (sodium fatty alcohol ether sulfate and sodium lauryl sulfate), the balance being tap water.

[0039] After degreasing, pickling, and alkali cleaning, the steel wire is immersed in the plating flux described at 75°C at a speed of 9 m / min, dried at 100°C, and then hot-dipped in a zinc-aluminum-magnesium alloy solution for 1 min. After cooling, the surface of the steel wire has no missing coating, uniform coating and good finish. The thickness of the coating is about 70-100μm. The results of the neutral salt spray test show that the time for rust spots to appear is 570 hours, and the time for rust spots to appear in traditional hot-dip galvanizing is 140 hours. The service life is much higher than that of hot-dip galvanized pure zinc.

Embodiment 3

[0041] Hot-dip galvanizing-6% aluminum-3% magnesium alloy flux formulation, the components are as follows:

[0042] 35% ZnCl 2 , 10% NaF, 3.5% CeCl 2 , 8% SnCl 2 , 2%H 2 o 2 , 0.5% surfactants (sodium fatty alcohol ether sulfate and sodium lauryl sulfate), the balance being tap water.

[0043] After degreasing, pickling and alkali cleaning, the steel wire is immersed in the plating flux described at 75°C at a speed of 10 m / min, dried at 120°C, and then hot-dipped in a zinc-aluminum-magnesium alloy solution for 3 minutes. After cooling, the surface of the steel wire has no missing coating, uniform coating and good finish. The thickness of the coating is about 80-100μm. The results of the neutral salt spray test show that the time for rust spots to appear is 790 hours, and the time for rust spots to appear in traditional hot-dip galvanizing is 140 hours. The service life is much higher than that of hot-dip galvanized pure zinc.

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Abstract

The invention relates to a plating flux for hot-dipping galvanized aluminum-magnesium alloys of steel wires, and belongs to the technical field of iron and steel material surface coating processes. The plating flux of the present invention consists of: ZnC2 35%-45%; NaF 2%-10%; CeCl2 0.5-3.5%; SnCl2 4.5%-8.5%; H2O2 0.5-2%; Surfactant 0.1%-0.5% , and the balance is water; the surfactant is sodium fatty alcohol ether sulfate and / or sodium dodecylsulfonate. In the invention, a zinc-aluminum-magnesium alloy coating is obtained by hot-dip plating on the steel wire surface through a reasonable formula of plating flux. The coating and the steel wire each maintain their original performance, with more than 99.9% of the metallurgical bonding interface, the coating structure is dense, there is no missing plating, and it can form a zinc-aluminum-magnesium ternary eutectic with excellent corrosion resistance. The corrosion resistance of the alloy coating is 2 to 4 times that of the ordinary hot-dip pure zinc coating. The plating flux has low cost, can be used repeatedly and is easy for industrial production.

Description

technical field [0001] The invention relates to a plating flux for hot-dipping galvanized aluminum-magnesium alloys of steel wires, and belongs to the technical field of iron and steel material surface coating processes. Background technique [0002] Traditional steel wire adopts hot-dip galvanizing protection technology; in order to improve the quality of hot-dip galvanizing, the steel wire is treated with plating flux before hot-dip galvanizing. The specific functions of the fluxing agent include removing impurities such as iron salts remaining on the surface of the steel wire after pickling, depositing a layer of salt film on the surface of the steel wire, isolating the surface of the steel wire from the air, and preventing the oxidation of the steel wire; it can be quickly decomposed when hot dipping galvanized alloys , It plays the role of enhancing surface activity on the surface of steel wire. [0003] The corrosion resistance of the steel wire after hot-dip galvaniz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C23C2/38
Inventor 郭凯岳增武李辛庚肖世荣张都清闫凤洁王雪刚王晓明樊志彬王宏
Owner STATE GRID CORP OF CHINA
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