Hot-dip galvanizing technology

A hot-dip galvanizing and process technology, applied in hot-dip plating process, metal material coating process, coating and other directions, can solve the problems of easy corrosion of zinc coating, low production efficiency, poor corrosion resistance of zinc, etc. Repeated process, improve work efficiency, good effect of galvanizing

Inactive Publication Date: 2016-06-08
CHONGQING YEGAO FURNITURE CO LTD
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AI Technical Summary

Problems solved by technology

In the atmosphere containing sulfur dioxide, hydrogen sulfide and marine atmosphere, the corrosion resistance of zinc is poor, especially in the atmosphere of high temperature, high humidity and organic acid, the zinc coating is easily corroded
[0003] At present, the hot-dip galvanizing proc

Method used

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Embodiment Construction

[0014] The technical solution disclosed by the present invention is a hot-dip galvanizing process, which is characterized in that it includes the following steps: 1) degreasing: chemical degreasing or water-based metal degreasing cleaning agent can be used to degrease, until the workpiece is completely soaked in water;

[0015] 2) Pickling: pickling with H2SO4 15%, thiourea 0.1%, 40-60°C or HCl20%, urotropine 3-5g / L, 20-40°C for pickling, adding corrosion inhibitor to prevent matrix over-corrosion and reduce the amount of hydrogen absorbed by the iron matrix,

[0016] At the same time, add anti-fog agent to suppress the escape of acid mist;

[0017] 3) Prepare immersion fluxing agent: NH4Cl100-150g / L, ZnCl2150-180g / L, 70~80℃, 1~2min, and add a certain amount of anti-knock agent;

[0018] 4) Drying and preheating: In order to prevent the workpiece from being deformed due to a sharp rise in temperature during immersion plating, and to remove residual moisture, prevent zinc expl...

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PUM

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Abstract

The invention discloses a hot-dip galvanizing technology. The hot-dip galvanizing technology is characterized by comprising steps as follows: 1) degreasing; 2) pickling; 3) preparation of a dip plating aid; 4) drying and preheating; 5) hot-dip galvanizing; 6) arrangement: workpiece arrangement after plating mainly includes removal of surface residual zinc and zinc nodules and is mainly completed by the aid of a special vibrator for hot-dip galvanizing; 7) passivation: passivation is performed by the aid of chromate such as 80-100 g/L of Na2Cr2O7 and 3-4 ml/L of sulfuric acid; 8) cooling: water cooling is adopted, but the temperature cannot be too low or too high, and the temperature is generally not lower than 30 DEG C and not higher than 70 DEG C. The hot-dip galvanizing technology is simple, multiple repeated procedures are avoided, the working efficiency is improved, and the galvanizing effect is good.

Description

technical field [0001] The invention relates to a hot-dip galvanizing process. Background technique [0002] Zinc is easily soluble in acid and alkali, so it is called amphoteric metal. Zinc hardly changes in dry air. In humid air, a dense basic zinc carbonate film will be formed on the surface of zinc. In the atmosphere containing sulfur dioxide, hydrogen sulfide and marine atmosphere, the corrosion resistance of zinc is poor, especially in the atmosphere of high temperature, high humidity and organic acid, the zinc coating is easily corroded. [0003] At present, the hot-dip galvanizing process is complicated and there is no unified standard, resulting in uneven quality of the hot-dip galvanizing process produced. Many repeated processes also make the production efficiency low, increase the labor burden of workers, and make the market competitiveness of the products less high. Contents of the invention [0004] In view of the above-mentioned defects of the prior art,...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/02C23C2/26
Inventor 车海波
Owner CHONGQING YEGAO FURNITURE CO LTD
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