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A long-term and reusable flux for hot-dip galvanizing aluminum-magnesium alloys

A hot-dip galvanizing, aluminum-magnesium alloy technology, applied in hot-dip galvanizing process, metal material coating process, coating and other directions, can solve the problems of short duration of flux, non-reusable, poor bonding strength, etc. To achieve the effect of promoting environmental protection characteristics, reducing harm, and reducing surface tension

Active Publication Date: 2017-12-29
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the deficiencies and problems existing in the prior art, such as missing plating, poor bonding strength between the coating and the steel material substrate, short effective time of the fluxing agent, and non-reusability of the iron and steel substrate, the present invention Provides a long-acting, reusable, environmentally friendly ammonium-free coating with excellent plating effect, environmental protection, wide range of alloy coating components, long service life, high combination of steel material substrate and coating, good coating finish, and industrial promotion and production. Flux

Method used

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  • A long-term and reusable flux for hot-dip galvanizing aluminum-magnesium alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Hot-dip galvanizing-22% aluminum-2% magnesium alloy plating formulation, the components are as follows:

[0032] ZnCl 2 25%; KF 2%; CaCl 2 5%; AgCl4.5%; non-alkali SP binary composite flooding and dispersing agent 2% (a mixture of propylene glycol methyl ether acetate and methoxy propionate, mass ratio 1:1); composite surfactant 0.1% (six A mixture of methyldisilazane and sodium polyoxypropylene ether chain hydrophobic sulfonate, the mass ratio is 1:1), and the rest is water.

[0033] After degreasing, pickling, and alkali cleaning, the iron and steel substrate is immersed in the plating flux described at 65°C at a speed of 10m / min, dried at 120°C, and then hot-dipped in a zinc-aluminum-magnesium alloy solution for 0.4 min, after cooling, the surface of the iron and steel substrate has no missing plating, the coating is uniform, and the finish is good (attached figure 1 shown). The thickness of the coating is about 75-125μm. The results of the neutral salt spray t...

Embodiment 2

[0035] Hot-dip galvanizing-20% aluminum-2.5% magnesium alloy plating formulation, the components are as follows:

[0036] ZnCl 2 28%; KF 6%; CaCl 2 8%; AgCl6.0%; non-alkali SP binary composite flooding and dispersing agent 2.5% (a mixture of propylene glycol methyl ether acetate and methoxy propionate, mass ratio 1:2); composite surfactant 3.5% (six A mixture of methyldisilazane and sodium polyoxypropylene ether chain hydrophobic sulfonate, the mass ratio is 1:2), and the rest is water.

[0037] After degreasing, pickling, and alkali cleaning, the iron and steel substrate is immersed in the plating flux described at 65°C at a speed of 10m / min, dried at 120°C, and then hot-dipped in a zinc-aluminum-magnesium alloy solution for 0.4 min, after cooling, the surface of the iron and steel substrate has no missing plating, the coating is uniform, and the finish is good. The thickness of the coating is about 85-120μm, and the results of the neutral salt spray test show that the t...

Embodiment 3

[0039] Hot-dip galvanizing-15% aluminum-3% magnesium alloy coating formulation, the components are as follows:

[0040] ZnCl 2 28%; KF 6%; CaCl 2 10%; AgCl 6.5%; non-alkali SP binary composite flooding and dispersing agent 2.5% (a mixture of propylene glycol methyl ether acetate and methoxy propionate, mass ratio 2:1); composite surfactant 0.3% (hexa A mixture of base disilazane and sodium polyoxypropylene ether chain hydrophobic sulfonate, mass ratio 1:1), and the rest is water.

[0041] After degreasing, pickling, and alkali cleaning, the iron and steel substrate is immersed in the plating flux described at 85°C at a speed of 12m / min, dried at 100°C, and then hot-dipped in a zinc-aluminum-magnesium alloy solution for 0.6 min, after cooling, the surface of the iron and steel substrate has no missing plating, the coating is uniform, and the finish is good. The thickness of the coating is about 90-140μm. The results of the neutral salt spray test show that the time for rus...

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Abstract

The invention discloses a long-ageing reusable plating assistant agent for zinc-aluminum-magnesium alloy for hot dipping. The plating assistant agent is prepared from the following raw materials in percentage by weight: 25 percent to 35 percent of ZnCl2, 2 percent to 10 percent of KF, 5 percent to 15 percent of CaCl2, 4.5 percent to 8.5 percent of AgCl, 2 percent to 3.5 percent of alkali-free SP binary compound flooding dispersing agent, 0.1 percent to 0.5 percent of compound surface active agent and the balance water. Through a reasonable formula of the plating assistant agent, a zinc-aluminum-magnesium alloy coating is obtained on the surface of a steel and iron material substrate by utilizing hot dipping; the coating and the steel and iron material substrate separately keep original performance; the coating is compact in structure and free of skip plating, and zinc-aluminum-magnesium ternary eutectic with excellent corrosion resistance can be formed. The plating assistant agent is low in cost, can be easily produced industrially, and can be widely suitable for hot dipping long-ageing reusable zinc-aluminum-magnesium alloy plating solution of which the Al content is 5 percent to 22 percent and the Mg content is 2 percent to 6 percent.

Description

technical field [0001] The invention relates to the technical field of steel material surface coating technology, in particular to a long-term, reusable hot-dip galvanized aluminum-magnesium alloy plating flux. Background technique [0002] The traditional steel material substrate adopts hot-dip galvanizing protection technology. The hot-dip galvanized aluminum-magnesium alloy coating has better corrosion resistance than pure zinc coating, and has become a research hotspot at home and abroad. In the process of hot-dip galvanizing aluminum-magnesium alloy on the iron and steel substrate, the role of the plating flux is to remove impurities such as iron salts on the surface of the iron and steel substrate after pickling, and deposit a layer of salt film on the surface of the iron and steel substrate. The surface of the substrate is isolated from the air to prevent the oxidation of the substrate of the steel material; it can be quickly decomposed when hot-dip galvanized alloys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/02C23C2/06
CPCC23C2/02C23C2/06
Inventor 郭凯李辛庚岳增武傅敏王晓明闫风洁曹建梅王学刚李晓宇樊志彬吴亚平
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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