Electrolysis plating assistant agent applicable to steel hot-dip galvanizing aluminum alloy coating and technological method thereof

A technology of hot-dip galvanizing and process method, which is applied in the direction of hot-dip galvanizing process, metal material coating process, coating, etc., which can solve the problems of missing plating surface, unevenness, insufficient salt film, etc., and achieve good corrosion resistance , Overcoming the lack of salt film and the effect of smooth coating surface

Inactive Publication Date: 2014-04-23
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems such as missed plating and surface unevenness on the surface of the alloy coating, optimize the plating flux suitable for hot-dip galvanized aluminum alloys through orthogonal tests, and use electrolytic activation flux to deposit electrolytically on the surface of the sample. A layer of uniform and moderately thick composite salt film, in order to overcome the shortcomings of insufficient salt film caused by the natural sedimentation process of the flux salt solution in the traditional solvent plating process, and the obtained coating has a smooth, bright surface and good corrosion resistance

Method used

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  • Electrolysis plating assistant agent applicable to steel hot-dip galvanizing aluminum alloy coating and technological method thereof
  • Electrolysis plating assistant agent applicable to steel hot-dip galvanizing aluminum alloy coating and technological method thereof
  • Electrolysis plating assistant agent applicable to steel hot-dip galvanizing aluminum alloy coating and technological method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] In the implementation of the present invention, the hot-dip Zn-Al alloy composition ratio is Zn: 95% and Al: 5% by mass percentage, that is, Zn-5% Al alloy. The purpose of the embodiments of the present invention is to provide a kind of electrolytic activation fluxing agent suitable for hot-dip galvanized aluminum alloy, the composition of the fluxing agent is: zinc chloride 550g / L, ammonium chloride 100g / L, Tin 20g / L, sodium fluoroaluminate 15g / L, sodium fluoride 15g / L, cerium chloride 10g / L. Several groups with small content differences were selected for the test, as shown in Table 1. The surface morphology of the coatings plated by several different flux ratios is as follows: figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 shown.

[0032] From Figure 1~6 It can be seen in sample 5 ( image 3 Shown) the surface quality of the coating is the best, that is, flat, smooth, without defects such as zinc bumps and missing plating, so that the for...

Embodiment 2

[0036]The purpose of the embodiment of the present invention is to provide an electrolytic activation fluxing process by using the optimal formulation of the above-mentioned fluxing agent in the embodiment 1, and the test scheme is shown in Table 2.

[0037] Table 2 Electrolytic activation process test scheme

[0038]

[0039] The specific process is as follows: first use iron wire to fix the drilled hole on the side of the ground sample so that it can be hung in the subsequent electrolytic cell; then put the sample into a hot sodium hydroxide solution with a mass fraction of 15% for degreasing treatment, wherein the temperature of the sodium hydroxide solution is 70-80°C, take it out after five minutes and put it into pure water for cleaning; then put the cleaned sample into hydrochloric acid with a mass fraction of 5% for derusting treatment, The temperature is room temperature, take it out after two minutes and put it into pure water for cleaning; then put the cleaned sa...

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Abstract

Belonging to the technical field of corrosion protection of steel materials, the invention relates to an electrolysis plating assistant agent applicable to a steel hot-dip galvanizing aluminum alloy coating and a technological method thereof. Specifically, the electrolysis plating assistant agent comprises: 150-650g/L zinc chloride, 20-160g/L ammonium chloride, 5-50g/L stannous chloride, 0-30g/L sodium fluoroaluminate, 0-30g/L sodium fluoride, 0-20g of cerium chloride, and the balance water. According to the invention, the plating assistant agent suitable for hot-dip galvanizing aluminum alloy is perferably selected by orthogonal test, and by adopting electrolysis activation assistant plating, a uniform composite salt film with moderate thickness can be formed on a sample surface by current deposition, thus overcoming the defect of salt film insufficiency generated by depending on the natural settling process of a plating assistant agent salt solution during traditional solvent assistant plating. The obtained coating has a smooth and bright surface, and good corrosion resistance.

Description

technical field [0001] The invention relates to an electrolytic fluxing agent suitable for hot-dip galvanized aluminum alloy coating of steel materials and a process method thereof, belonging to the technical field of anticorrosion of steel materials. Background technique [0002] Hot-dip galvanizing is one of the most effective means to delay the environmental corrosion of steel materials. With the development of science and technology and modern industry, higher requirements are put forward for hot-dip galvanizing products. In order to improve the corrosion resistance of the coating of steel hot-dip galvanized parts, people usually add one or more alloying elements to the zinc bath. When hot-dip galvanizing, adding a small amount of aluminum to the zinc bath can reduce the oxidation of zinc on the surface of the zinc bath, and obtain a smooth and bright coating. When the zinc-aluminum alloy is solidified, a eutectic reaction occurs at 382°C, that is, the alloy has a low m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/30C23C2/06
Inventor 贺志荣何应董金虎刘继拓解凯解亚丹
Owner SHAANXI UNIV OF TECH
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