A continuous hot-dip galvanizing process for strip steel

A technology of hot-dip galvanizing and strip steel, applied in hot-dip galvanizing process, metal material coating process, coating and other directions, can solve the problems of poor adhesion of zinc layer, decrease of Al percentage, and no effect. , to achieve the effect of improved wear resistance and adhesion, optimized grain orientation of the coating, and simple production process

Active Publication Date: 2011-12-21
WUXI GUANGRUN METAL PROD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the solubility of Zn in the Fe-Al intermediate transition layer reaches supersaturation and a zinc-rich solid solution is formed, the absolute content of Al in the intermediate layer does not decrease at this time, but the percentage of Al decreases significantly, and at the same time because of the zinc Supersaturation destroys the homogeneity of the Fe-Al intermediate transition layer, thus causing the intermediate layer to lose its adhesion and prevent diffusion, and to form a thicker Fe-Zn alloy layer, so that the adhesion of the zinc layer is simultaneously go bad
[0006] In the prior art, the adhesion between the coating and the steel base is improved by changing the composition of the strip or by controlling the surface roughness of the hot-dip galvanized strip to form a coating on the surface, but no good effect has been achieved. Currently, by controlling the composition of the coating The method of improving the adhesion between the coating and the steel base is not ideal

Method used

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  • A continuous hot-dip galvanizing process for strip steel

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Effect test

Embodiment 1

[0023] A strip steel continuous hot-dip galvanizing process, the process comprises the steps of:

[0024] (1) The configuration of the coating melt: take 90 parts of zinc ingots, 8 parts of aluminum ingots, 3 parts of pure iron, 1.2 parts of copper ingots, and 0.3 parts of magnesium ingots and put them in an induction heating furnace for melting. The melting heating temperature is 730°C. After homogenization, control the temperature of the coating melt to 650°C for use;

[0025] (2) strip steel degreasing pre-treatment: after the strip steel is uncoiled, it enters the chemical degreasing treatment solution tank for chemical degreasing, puts water and solid alkali in the solution tank to make a water-alkali solution, and the weight percentage of solid alkali in the water-alkali solution Concentration: 2.5%, solution temperature: 90°C; then enter the first clear water tank for cleaning; then enter the electrolytic degreasing solution tank for electrolytic degreasing, put water a...

Embodiment 2

[0031] A strip steel continuous hot-dip galvanizing process, the process comprises the steps of:

[0032] (1) Configuration of the coating melt: take 92 parts of zinc ingots, 5 parts of aluminum ingots, 5 parts of pure iron, 0.8 parts of copper ingots, and 0.8 parts of magnesium ingots and put them in an induction heating furnace to melt, melting and heating temperature: 710 ° C, uniform After melting, control the temperature of the coating melt to 670°C for use;

[0033] (2) strip steel degreasing pre-treatment: after the strip steel is uncoiled, it enters the chemical degreasing treatment solution tank for chemical degreasing, puts water and solid alkali in the solution tank to make a water-alkali solution, and the weight percentage of solid alkali in the water-alkali solution Concentration: 3.5%, solution temperature: 70°C; then enter the first clear water tank for cleaning; then enter the electrolytic degreasing solution tank for electrolytic degreasing, put water and soli...

Embodiment 3

[0039] A strip steel continuous hot-dip galvanizing process, the process comprises the steps of:

[0040] (1) Configuration of coating melt: Take 91 parts of zinc ingots, 6 parts of aluminum ingots, 4 parts of pure iron, 1.0 parts of copper ingots, and 0.5 parts of magnesium ingots and melt them in an induction heating furnace. After melting, control the temperature of the coating melt to 660°C for use;

[0041] (2) strip steel degreasing pre-treatment: after the strip steel is uncoiled, it enters the chemical degreasing treatment solution tank for chemical degreasing, puts water and solid alkali in the solution tank to make a water-alkali solution, and the weight percentage of solid alkali in the water-alkali solution Concentration: 3.0%, solution temperature: 80°C; then enter the first clear water tank for cleaning; then enter the electrolytic degreasing solution tank for electrolytic degreasing, put water and solid alkali into the solution tank to make a water-alkali soluti...

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Abstract

The invention discloses a continuous hot dip galvanizing process for strip steel. Based on a large number of experiments, the components of plating coat melting liquid are determined and are as follows in parts by weight: 90-92 parts of zinc ingot, 5-8 parts of aluminium ingot, 3-5 parts of pure iron, 0.8-1.2 parts of copper ingot and 0.3-0.8 part of magnesium ingot. Advantageous combination is realized through optimizing hot galvanizing process conditions and parameters, a majority of plating coats of the hot dip galvanizing strip steel is comprised by eta, plating coat grain orientation is optimized, and the scratch resistance, the abrasion resistance and the adhesion property of the plating layer are obviously improved.

Description

technical field [0001] The invention relates to the field of metal surface coating, in particular to a strip steel continuous hot-dip galvanizing process. Background technique [0002] Due to its good corrosion resistance, excellent coating performance and clean appearance, hot-dip galvanized strip steel has been widely used in manufacturing industries such as household appliances and automobile body panels. The requirements for the coating of hot-dip galvanized strip steel are strong adhesion between the coating and the substrate, and it will not fall off when it is stamped and deformed. In addition, it must have good welding performance, corrosion resistance and phosphating performance to ensure the adhesion of the paint film and paint coating. later corrosion resistance. However, there are problems such as powdering and peeling of the coating during the stamping process of the hot-dip galvanized steel strip, which causes damage to the coating and further affects the corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/40C23C2/02C23C2/16C23C2/26
Inventor 王一新黎立
Owner WUXI GUANGRUN METAL PROD CO LTD
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