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Method for plating surface of steel with Al-Zn-Mg-Si alloy plating layer in continuous hot-dipping manner

A technology of alloy coating and hot-dip coating, which is applied in hot-dip coating process, metal material coating process, coating, etc., can solve the problem of uneven distribution of plating solution components, difficulty in continuous hot-dip coating production of alloy coating, and difficulty in preparing high-quality coatings. Quality alloy coating products and other issues, to achieve the effect of increased quantity, high yield and uniform composition

Active Publication Date: 2016-04-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason for limiting its application and promotion is that the alloy coating is difficult to achieve continuous hot-dip coating production.
Studies have found that Mg and Si in the plating solution will form Mg with high melting point and low density. 2 Si phase, and this phase is easy to float in the plating solution to form scum, and cause uneven distribution of plating solution components, making it difficult to prepare high-quality Al–Zn–Mg–Si alloy coating products

Method used

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  • Method for plating surface of steel with Al-Zn-Mg-Si alloy plating layer in continuous hot-dipping manner
  • Method for plating surface of steel with Al-Zn-Mg-Si alloy plating layer in continuous hot-dipping manner
  • Method for plating surface of steel with Al-Zn-Mg-Si alloy plating layer in continuous hot-dipping manner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The experimental components are listed in Table 1, and the alloy coating with Mg content of 1.23wt.% was prepared by the new process. After the steel plate has been washed by alkali and pickling, it is heated in 630℃ 2 / N 2 Reductive annealing in mixed gas, then immersing in 630°C alloy plating solution for hot-dip plating, followed by 2.5s furnace cooling annealing process, and then air knife thinning and water cooling to obtain Al–Zn–Si–1.23Mg alloy coating.

[0030] Al–Zn–Si–1.25Mg alloy coating contains dendritic Al phase and interdendritic Zn phase, but there are a lot of fine Mg in the interdendritic region 2 Si phase particles. Due to the annealing process, the Mg on the surface of the coating 2 The Si phase is an equilateral triangle, and the number increases.

Embodiment 2

[0032] The experimental composition is listed in Table 1, and the alloy coating with Mg content of 3.01wt.% was prepared by the new process. After the steel plate has been washed by alkali and pickling, it is heated in 630℃ 2 / N 2 Reductive annealing in mixed gas, then immersing in alloy plating solution at 630°C for hot-dip plating, followed by 1.5s annealing process, air knife thinning and water cooling to obtain Al–Zn–Si–3Mg alloy coating.

[0033] Al–Zn–Si–3Mg alloy coating contains dendritic Al phase and interdendritic Zn phase, but there is a large amount of Mg in the interdendritic region 2 Si phase particles and a small amount of MgZn 2 phase particles. And due to the annealing process, the Mg on the surface of the coating 2 The Si phase content is higher than 10%.

Embodiment 3

[0035] The experimental composition is listed in Table 1, and the alloy coating with Mg content of 3.87wt.% was prepared by the new process. After the steel plate has been washed by alkali and pickling, it is heated in 630℃ 2 / N 2 Reductive annealing in mixed gas, then immersing in alloy plating solution at 630°C for hot-dip plating, followed by 3s annealing process, and then air knife thinning and water cooling to obtain Al–Zn–Si–4Mg alloy coating.

[0036] Al–Zn–Si–4Mg alloy coating contains dendritic Al phase and interdendritic Zn phase, but there is no obvious Mg in the interdendritic region 2 Si phase, but MgZn appears 2 Mutually.

[0037] Corrosion Resistance Comparison of Alloy Coatings

[0038] Compared with Al–Zn–Si coating, the corrosion resistance of Al–Zn–Mg–Si alloy coating is significantly improved. After soaking in 3.5wt.%NaCl solution for 90 days, the weight loss of Al–Zn–Mg–Si alloy coating (Mg content 1.23~3.87wt.%) is only 1 / 3~1 / 3 of Al–Zn–Si coating 4...

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Abstract

The invention relates to a method for plating the surface of steel with an Al-Zn-Mg-Si alloy plating layer in a continuous hot-dipping manner and a manufacturing process of the Al-Zn-Mg-Si alloy plating layer. The Al-Zn-Mg-Si alloy plating layer manufactured through the process comprises, by weight percentage, 48% to 55% of Al, 40% to 50% of Zn, 1% to 4% of Mg and 1% to 3% of Si. The manufacturing process of the Al-Zn-Mg-Si alloy plating layer includes the steps of firstly, surface cleaning treatment, secondly, reducing and annealing, thirdly, hot-dipping plating in plating liquid at the temperature from 550 DEG C to 700 DEG C, fourthly, the annealing process for 0.1 s to 5 s at the temperature from 400 DEG C to 700 DEG C and air cutter leveling and fifthly, cooling. The manufactured alloy plating layer contains Al-rich dendritic crystal phases, Zn-rich interdendritic phases, Mg2Si phases and a small amount of MgZn2 phases. The preferable alloy components can guarantee the even plating liquid components, floating residues are few, and the quality of the plating layer manufactured through the continuous hot-dipping process is uniform and stable. The content of the Mg2Si phases on the surface of the plating layer can be increased through the annealing process performed after dipping plating is performed, and the corrosion resistance of the plating layer is improved.

Description

technical field [0001] The invention relates to a method for hot-dipping Al-Zn-Mg-Si alloy coating on the surface of steel, belongs to the technical field of metal coating, and can be widely used in steel protection in corrosive environments. Background technique [0002] Hot-dip plating process is an economical and effective anti-corrosion treatment method for metal structural parts. Hot-dip aluminum-zinc alloy coating has good corrosion resistance and cathodic protection ability, and is widely used in many fields such as construction industry, automobile, household appliances, shipbuilding industry, and electrical industry. [0003] The continuous hot-dip plating process generally includes five parts: pre-treatment section, pre-plating protection section, hot-dip plating section, air knife section, and cooling section. The pre-treatment section is mainly to clean the surface of the steel plate and remove oxides; the pre-plating protection section is mainly to expose the f...

Claims

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Application Information

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IPC IPC(8): C23C2/12C23C2/06C23C2/02C23C2/28C22C21/10C22C18/04C22C30/06
CPCC22C18/04C22C21/10C22C30/06C23C2/02C23C2/06C23C2/12C23C2/28
Inventor 李谦刘蔚李谋成罗群于之刚张捷宇周国治
Owner SHANGHAI UNIV
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