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High-hardness environment-friendly galvanization technological method

A process method and an environmentally friendly technology, which is applied in the field of chemistry and chemical engineering, can solve the problems of environmental pollution and insufficient environmental protection

Inactive Publication Date: 2016-03-23
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

[0015] First, potassium sodium tartrate, hydrazine hydrochloride and dioctyl phthalate are dissolved in pure water according to a mass ratio of 2:1:2 to obtain a stabilizer with a total weight of 100g / L; Dissolve vinyl ether and benzylidene acetone in pure water at a mass ratio of 1:3 to obtain a brightener with a total weight of 100g / L; then prepare a 100g / L nicotinic acid solution as a softener.

[0016] Plating solution preparation: first add 400L of pure water to the plating tank, heat it to about 50°C, then add 220g / L of potassium chloride, 40g / L of boric acid, and 60g / L of zinc chloride in sequence, dissolve and stir evenly Then add the stabilizing agent of 25ml / L, stir evenly, continue to add the dibutyltin dilaurate of 12g / L, and the softening agent of 30ml / L, the brightening agent of 2ml / L and the polyethylene glycol 600 of 1ml / L.

[0017] The prepared plating solution is filtered and stirred for more than 2 hours, the temperature is controlled between 10 and 30°C, an...

Embodiment 2

[0019] First, dissolve methanesulfonic acid and dioctyl phthalate in pure water according to a mass ratio of 1:2 to obtain a stabilizer with a total weight of 100g / L; Diethyl phthalate and benzylidene acetone are dissolved in pure water according to a mass ratio of 1:1:5 to obtain a brightener with a total weight of 100g / L; then nicotinic acid and sodium saccharin are dissolved according to a mass ratio of 1:2 In water, a softening agent with a total weight of 100 g / L was obtained.

[0020] Plating solution preparation: first add 400L of pure water to the plating tank, heat it to about 50°C, then add 220g / L of potassium chloride, 40g / L of boric acid, and 60g / L of zinc chloride in sequence, dissolve and stir evenly Then add the stabilizing agent of 30ml / L, stir evenly, continue to add the dibutyltin dilaurate of 15g / L, and the softening agent of 25ml / L, the brightening agent of 2ml / L and the polyethylene glycol 600 of 1ml / L.

[0021] The prepared plating solution is filtered a...

Embodiment 3

[0023] First, ammonium oxalate, hydrazine hydrochloride and dioctyl phthalate are dissolved in pure water according to a mass ratio of 1:1:2 to obtain a stabilizer with a total weight of 100g / L; Ether and benzylidene acetone are dissolved in pure water according to the mass ratio of 1:3 to obtain a brightener with a total weight of 100g / L; then nicotinic acid and sodium saccharin are dissolved in water according to a mass ratio of 1:2 to obtain a total weight of 100g / L softener.

[0024] Plating solution preparation: first add 400L of pure water to the plating tank, heat it to about 50°C, then add 220g / L of potassium chloride, 40g / L of boric acid, and 60g / L of zinc chloride in sequence, dissolve and stir evenly Then add the stabilizer of 20ml / L, stir evenly, continue to add the dibutyltin dilaurate of 20g / L, and the softening agent of 30ml / L, the brightening agent of 2ml / L and the polyethylene glycol 600 of 1ml / L.

[0025] The prepared plating solution is filtered and stirre...

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Abstract

The invention discloses a high-hardness environment-friendly galvanization technological method. A plating solution comprises 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. Plating is conducted for 2-10 min with the electric current density being 0.5-2 A / dm<2>, and a zinc-tin alloy plating layer with thickness in 1-10 microns is obtained. According to the high-hardness environment-friendly galvanization technological method, the plating solution is stable, and the obtained plating layer has high Vickers hardness; in addition, the plating layer is bright, and the corrosion resistance is detected in neutral salt spray for 72 hours.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a galvanizing process technology. Background technique [0002] Galvanizing refers to a surface treatment technology that coats a layer of zinc on the surface of metals, alloys or other materials for aesthetics and anti-rust effects. For the steel substrate, the zinc coating is an anodic coating, which is mainly used to prevent the corrosion of steel, and its protective performance has a great relationship with the thickness of the coating. 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, and it is difficult to meet the environment with higher requirement...

Claims

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Application Information

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IPC IPC(8): C25D3/22C25D5/52
CPCC25D3/22C25D5/52
Inventor 丁恩松
Owner 扬州市佳佳镀锌有限公司
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