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Hot-dip galvanized aluminum-magnesium plating solution for steel surface and plating method using the same

A technology of hot-dip galvanizing and steel, applied in hot-dip plating process, metal material coating process, coating and other directions, can solve the problems of increasing bending, winding times, affecting use, and surface cracks of steel wire and its coating.

Active Publication Date: 2021-11-02
天津市新宇彩板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Hot-dip galvanized aluminum treatment for steel wires for packaging can provide steel wires with long-lasting metallic luster. While ensuring aesthetics, it can avoid corrosion of steel wires in humid environments during storage, and corrosion pitting will affect the steel wires. The strength of the thread affects its use in packaging and fixing
However, the steel wire will be bent and wound repeatedly during use, especially in the process of repeated use, which will increase the number of times of bending and winding. Repeated bending and winding will increase the chance of cracks on the surface of the steel wire and its coating. risk, the occurrence of cracks will reduce the service strength of the steel wire, and the cracks on the coating will lead to the deterioration of corrosion resistance, which creates new requirements for the steel wire and its coating. The present invention is based on this background. Adjust the galvanized aluminum process and the composition of the plating solution to meet the use of steel wires under repeated bending conditions

Method used

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  • Hot-dip galvanized aluminum-magnesium plating solution for steel surface and plating method using the same
  • Hot-dip galvanized aluminum-magnesium plating solution for steel surface and plating method using the same
  • Hot-dip galvanized aluminum-magnesium plating solution for steel surface and plating method using the same

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The atomic percentage of each element in the plating solution is Al: 20%, Mg: 0.8%, Si: 3%, Ti: 1%, B: 2.2%, Ce: 0.45%, and the balance is Zn.

[0022] The preparation process of the plating layer includes the following steps: preparing a prefabricated alloy ingot according to the content ratio of each element in the plating solution. The prefabricated alloy ingot is fully melted, and the zinc liquid in the zinc pot is kept at 510°C for use. Selection of packaging steel wire, the composition of each element of the steel wire by weight percentage is: C: 0.10-0.40%, Si: 0.1-0.3%, Mn: 1.0-2.0%, P≤0.025%, S≤0.015% and Al:0.015- 0.1%, Ti: 0.11-0.16%, Nb: 0.1-0.13% and V: 0.2-0.25%, and the rest are iron Fe and unavoidable impurities. The steel wire was prepared by cold rolling and drawn to a diameter of 3 mm. Degrease, brush, rinse and dry the steel wire. The purpose is to remove residual grease and stains on the board surface. After the steel wire is heated, cooled and ...

Embodiment 2-12

[0025] See Table 1 and Table 3 for the composition of the plating solution in each embodiment. The specific preparation method is the same as that of Example 1, only the composition of the plating solution is adjusted. See Table 2 and Table 4 for the corrosion resistance test and bending test results of each embodiment.

[0026] In Examples 1-6, the composition of the plating solution of the present application was adopted, and no obvious red rust appeared after the salt spray test for 2000 hours, and no visible cracks were observed in the surface coating after repeated bending. In Example 6, if the preferred atomic ratio range of Ti and B was not used, part of the red rust appeared on the surface of the coating after 2000 hours of salt spray testing, and cracks were observed on the surface after bending 10 times with a radius of 5 cm. Reduce the Al atomic ratio range in embodiment 7, change the Si atomic ratio range in embodiment 8-9, do not add rare earth Ce in embodiment 10...

Embodiment 13

[0036] The atomic percentage of each element in the plating solution is Al: 20%, Mg: 0.8%, Si: 3%, Ti: 1%, B: 2.2%, Ce: 0.45%, and the balance is Zn. The preparation process of the plating layer includes the following steps: preparing a prefabricated alloy ingot according to the content ratio of each element in the plating solution. The prefabricated alloy ingot is fully melted, and the zinc liquid in the zinc pot is kept at 430-480°C for use. Selection of packaging steel wire, the composition of each element of the steel wire by weight percentage is: C: 0.10-0.40%, Si: 0.1-0.3%, Mn: 1.0-2.0%, P≤0.025%, S≤0.015% and Al:0.015- 0.1%, Ti: 0.11-0.16%, Nb: 0.1-0.13% and V: 0.2-0.25%, and the rest are iron Fe and unavoidable impurities. The steel wire was prepared by cold rolling and drawn to a diameter of 3 mm. Degrease, brush, rinse and dry the steel wire. The purpose is to remove residual grease and stains on the board surface. After the steel wire is heated, cooled and kept ...

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Abstract

The invention provides a hot-dip galvanized aluminum-magnesium plating solution on the surface of steel to alleviate the risk of cracks on the coating surface of steel under repeated bending conditions in the prior art. The present invention improves corrosion resistance by adding alloy element Mg. In order to suppress the risk of cracks on the surface of the steel and its coating produced by repeated bending, a certain amount of Ti and B is added to improve the corrosion resistance and at the same time precipitate an intermediate phase at the grain boundary to inhibit the generation and expansion of cracks. The final galvanized steel adopts air cooling combined with water cooling to further refine the grains, improve corrosion resistance and inhibit crack growth. The final product extends the service life of galvanized aluminum-magnesium steel.

Description

technical field [0001] The invention relates to the surface treatment technology of metal materials, in particular to a hot-dip galvanized aluminum-magnesium bath on the surface of steel and a coating method using the bath. Background technique [0002] The hot-dip galvanized layer of steel has a good protective effect on steel products. The consumption of zinc in steel galvanizing accounts for more than 50% of zinc production. Galvanizing methods include hot-dip galvanizing, electro-galvanizing, thermal spraying, vacuum evaporation, mechanical barrel plating, etc. Among them, the amount of zinc in hot-dip galvanizing accounts for more than 90% of the total galvanizing consumption. The hot-dip galvanizing method is simple, the zinc layer is thick, the corrosion resistance is strong, the cost is low, and the thickness, toughness and surface state of the coating can be controlled. The main technological process of hot-dip galvanizing is: alkaline cleaning and degreasing-wat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C22C18/04C22C38/02C22C38/04C22C38/06C22C38/14C22C38/12C23C2/38
CPCC23C2/06C22C18/04C22C38/02C22C38/04C22C38/06C22C38/14C22C38/12C23C2/38
Inventor 刘岳华杜宝新杜天宇赵利明
Owner 天津市新宇彩板有限公司
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