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Full-dehydration high-hardness highly corrosion-resistant galvanizing method

A process method and high hardness technology, applied in the field of chemical industry, can solve the problems of environmental pollution and insufficient environmental protection

Inactive Publication Date: 2016-03-02
扬州市佳佳镀锌有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the conventional galvanizing process is to obtain a 2-20 micron thick galvanized protective layer through chemical degreasing, electrolytic degreasing, acid activation, electro-galvanizing, light-emitting, passivation, drying and other steps. The corrosion resistance can usually reach the neutral salt spray test for 72 hours, which is difficult to meet the environment with higher requirements for corrosion resistance; the corrosion resistance after hexavalent chromium color passivation is higher, but the environmental pollution is not enough for environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, dissolve potassium sodium tartrate, hydrazine hydrochloride and dioctyl phthalate in pure water at a mass ratio of 2:1:2 to obtain a stabilizer with a total weight of 100g / L; in the same way, bisphenol A polyoxygen Vinyl ether and benzylidene acetone were dissolved in pure water at a mass ratio of 1:3 to obtain a brightener with a total weight of 100g / L; then a 100g / L niacin solution was prepared as a softener.

[0017] Plating solution preparation: first add 400L of pure water into the plating tank, heat to about 50℃, then add 220g / L potassium chloride, 40g / L boric acid, 60g / L zinc chloride, and dissolve and stir evenly ; Then add 25ml / L stabilizer, stir evenly, continue to add 12g / L dibutyltin dilaurate, 30ml / L softener, 2ml / L brightener and 1ml / L polyethylene glycol 600.

[0018] Post-passivation treatment solution: Add 200L of pure water to the plating tank, and add 4Kg of dioctyl phthalate DEHP, 1Kg of pentaerythritol stearate and 0.5Kg of polyethylene glycol 400...

Embodiment 2

[0022] First, dissolve methanesulfonic acid and dioctyl phthalate in pure water at a mass ratio of 1:2 to obtain a stabilizer with a total weight of 100g / L; in the same way, bisphenol A polyoxyethylene ether, Lin Diethyl phthalate and benzylidene acetone were dissolved in pure water in a mass ratio of 1:1:5 to obtain a brightener with a total weight of 100g / L; then niacin and sodium saccharin were dissolved in a mass ratio of 1:2 The softener with a total weight of 100g / L is obtained in water.

[0023] Plating solution preparation: first add 400L of pure water into the plating tank, heat to about 50℃, then add 220g / L potassium chloride, 40g / L boric acid, 60g / L zinc chloride, and dissolve and stir evenly ; Then add 30ml / L stabilizer, stir well, continue to add 15g / L dibutyltin dilaurate, 25ml / L softener, 2ml / L brightener and 1ml / L polyethylene glycol 600.

[0024] Post-passivation treatment solution: Add 200L of pure water to the plating tank, and add 4Kg of dioctyl phthalate DEHP,...

Embodiment 3

[0028] First, dissolve ammonium oxalate, hydrazine hydrochloride and dioctyl phthalate in pure water at a mass ratio of 1:1:2 to obtain a stabilizer with a total weight of 100g / L; in the same way, bisphenol A polyoxyethylene Ether and benzalacetone were dissolved in pure water according to a mass ratio of 1:3 to obtain a brightener with a total weight of 100g / L; then niacin and sodium saccharin were dissolved in water according to a mass ratio of 1:2 to obtain a total weight of 100g / L softener.

[0029] Plating solution preparation: first add 400L of pure water into the plating tank, heat to about 50℃, then add 220g / L potassium chloride, 40g / L boric acid, 60g / L zinc chloride, and dissolve and stir evenly ; Then add 20ml / L stabilizer, stir well, continue to add 20g / L dibutyltin dilaurate, 30ml / L softener, 2ml / L brightener and 1ml / L polyethylene glycol 600.

[0030] Post-passivation treatment solution: Add 200L of pure water to the plating tank, and add 4Kg of dioctyl phthalate DEH...

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PUM

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Abstract

The invention discloses a full-dehydration high-hardness highly corrosion-resistant galvanizing method. Plating liquid is formed by 180-250 g / L of potassium chloride, 50-80 g / L of zinc chloride, 10-20 g / L of dibutyltin dilaurate, 30-45 g / L of boric acid, 10-50 ml / L of stabilizer, 0.5-5 ml / L of brightener, 10-50 ml / L of softener and 1-5 ml / L of polyethylene glycol 600. Electroplating is carried out for 2-10 min with the current density of 0.5-2 A / dm2, and a zinc-tin alloy plating layer 1-10 micron thick is obtained. The plating liquid is stable, the obtained plating layer is high in Vickers hardness and bright, and the corrosion resistance is above 72 h in neutral salt mist.

Description

Technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and particularly relates to galvanizing technology. Background technique [0002] Zinc plating refers to a surface treatment technology that coats a layer of zinc on the surface of metals, alloys or other materials for aesthetics and rust prevention. For steel substrates, zinc coating is an anodic coating. It is mainly used to prevent corrosion of steel. The quality of its protective performance is closely related to the thickness of the coating. At present, the conventional galvanizing process is through the steps of chemical degreasing, electrolytic degreasing, acid activation, electro-galvanizing, light extraction, passivation, drying, etc., to obtain a 2-20 micron thick galvanized protective layer, which is blue or white passivated. The corrosion resistance is usually up to 72 hours in a neutral salt spray test, which is difficult to meet for environments with higher co...

Claims

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Application Information

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IPC IPC(8): C25D3/22C25D5/52
Inventor 丁恩松
Owner 扬州市佳佳镀锌有限公司
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