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Plating auxiliary for hot dip aluminum plating and hot dip aluminum plating process for steel structural part

A technology for hot-dip aluminum plating and steel structural parts, which is applied in hot-dip plating process, metal material coating process, coating, etc. Uniformity and other problems, to achieve the effect of smooth coating

Inactive Publication Date: 2017-11-21
SHENGLI COLLEGE CHINA UNIV OF PETROLEUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problems of thin coating, uneven growth of the surface aluminum layer and inner alloy layer, and poor coating quality in the hot-dip aluminum coating method of the prior art, and provide a method for improving coating quality and thickness. , a fluxing agent capable of strong corrosion inhibition and fluxing effects, and a method for using the fluxing agent to carry out hot-dip aluminum plating of steel structural parts

Method used

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  • Plating auxiliary for hot dip aluminum plating and hot dip aluminum plating process for steel structural part
  • Plating auxiliary for hot dip aluminum plating and hot dip aluminum plating process for steel structural part
  • Plating auxiliary for hot dip aluminum plating and hot dip aluminum plating process for steel structural part

Examples

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Effect test

Embodiment 1

[0036] The hot-dip aluminum plating on the surface of the hot-rolled 35CrMo material adopts the following process:

[0037] 1) Pretreatment: first soak the steel parts in acetone for 10-15 minutes for degreasing treatment and wash with water. Then soak the degreased steel parts in acid solution at 50-80°C for 2-5 minutes for derusting treatment, and then expose the clean surface after washing with water. The acid solution used is a 4:1 mixture of sulfuric acid with a concentration of 15% to 20% and hydrochloric acid with a concentration of 10% to 12%.

[0038] 2) Flux plating treatment: immerse the cleaned steel piece in the flux flux at 80°C for 12 minutes for flux flux treatment, and dry it; the flux flux consists of the following components by weight percentage, 2% NaCl, 4% KF, 2%ZnCl 2 , and the rest is water.

[0039] 3) Hot-dip aluminum plating: dip the dried steel piece into molten aluminum at 780°C for hot-dip aluminum plating, and pull out the steel piece after 6 m...

Embodiment 2

[0043] The hot-dip aluminum plating on the surface of the hot-rolled 35CrMo material adopts the following process:

[0044] 1) Pretreatment: first soak the steel parts in acetone for 10-15 minutes for degreasing treatment and wash with water. Then soak the degreased steel parts in acid solution at 50-80°C for 2-5 minutes for derusting treatment, and then expose the clean surface after washing with water. The acid solution used is a 4:1 mixture of sulfuric acid with a concentration of 15% to 20% and hydrochloric acid with a concentration of 10% to 12%.

[0045] 2) Flux treatment: immerse the cleaned steel piece in the flux at 78°C for 15 minutes for flux treatment, and dry it; the flux consists of the following components by weight percentage, 1.5% NaCl, 3.8% KF, 1.8%ZnCl 2 , and the rest is water.

[0046] 3) Hot-dip aluminizing: dip the dried steel piece into molten aluminum at 700°C for hot-dip aluminizing, and pull out the steel piece after 8 minutes; the pulling speed i...

Embodiment 3

[0049] The hot-dip aluminum plating on the surface of the hot-rolled 35CrMo material adopts the following process:

[0050] 1) Pretreatment: first soak the steel parts in acetone for 10-15 minutes for degreasing treatment and wash with water. Then soak the degreased steel parts in acid solution at 50-80°C for 2-5 minutes for derusting treatment, and then expose the clean surface after washing with water. The acid solution used is a 4:1 mixture of sulfuric acid with a concentration of 15% to 20% and hydrochloric acid with a concentration of 10% to 12%.

[0051] 2) Flux treatment: immerse the cleaned steel piece in the flux at 82°C for 10 minutes for flux treatment, and dry it; the flux consists of the following components by weight percentage, 3% NaCl, 5.2% KF, 2.5%ZnCl 2 , and the rest is water.

[0052] 3) Hot-dip aluminizing: dip the dried steel piece into molten aluminum at 780°C for hot-dip aluminizing, and pull out the steel piece after 3 minutes; the pulling speed is ...

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Abstract

The invention discloses a plating auxiliary for hot dip aluminum plating and a hot dip aluminum plating process for a steel structural part and belongs to the technical field of metal corrosion prevention surface engineering. The plating auxiliary is characterized by being composed of the following components, by weight, of 1.5%-3% of NaCl, 3.8%-5.2% of KF, 1.8%-2.5% of ZnCl2 and the balance water. The plating auxiliary and the hot dip aluminum plating process are adopted for steel part surface aluminum plating, the plating is smooth and bright, generation of plating leakage and convex points is avoided on the surface of the plating, the thickness of the plating is more than 140 [mu]m, and the thicknesses of the plating and an alloy layer are even. After steel part assisted plating, the plating auxiliary forms a uniform covering layer, iron salt and oxides remaining on the workpiece surface can be removed, a workpiece can be prevented from being oxidized before dipping in a melting alloy, and the workpiece can be quickly decomposed or melted when meeting the melting alloy again, it is guaranteed that the molten metal fully wets the workpiece, and strong corrosion inhibition and plating assisting effects are achieved.

Description

technical field [0001] The invention discloses a plating flux for hot-dip aluminum plating and a hot-dip aluminum plating process for steel structural parts, belonging to the technical field of metal anti-corrosion surface engineering. Background technique [0002] As an important basic material in industrial construction, steel's corrosion and wear have always been the main problems that plague people. Hot-dip aluminum plating technology is a simple and efficient surface anti-corrosion treatment technology, which has always been concerned by domestic and foreign counterparts. After the surface of the steel is aluminized, it not only combines the corrosion resistance of aluminum with the strength of steel, but also makes the steel have new properties, namely heat resistance, and has good reflectivity to light and heat. After the workpiece is aluminized, it is diffused and has High corrosion resistance, high temperature oxidation resistance, wear resistance, high hardness an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/02C23C2/12
CPCC23C2/02C23C2/12
Inventor 郭丽娟张潇华谭哲张强尹天津刘高旭秦鹏徐鹏飞
Owner SHENGLI COLLEGE CHINA UNIV OF PETROLEUM
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