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Electrogalvanizing method based on glycine betaine-urea-water deep-eutectic solvent

A technology of deep eutectic solvent and betaine, which is applied in the field of electroplating, can solve problems such as equipment corrosion and pollution, and achieve the effect of reducing corrosion potential

Active Publication Date: 2017-03-15
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, cyanide galvanizing is seriously polluted because it contains highly toxic cyanide.
Chloride galvanizing bath contains a large amount of potassium chloride, which seriously corrodes equipment

Method used

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  • Electrogalvanizing method based on glycine betaine-urea-water deep-eutectic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First weigh 0.2 mol of betaine, 0.4 mol of urea, and 0.6 mol of distilled water and place them in a beaker, seal the beaker with plastic wrap, and then stir at a constant temperature of 80°C to obtain a transparent deep eutectic solvent. Then add 0.02 mol of zinc chloride and stir at a constant temperature of 80° C. to obtain a zinc-containing deep eutectic solvent.

[0031] Use a pure zinc plate as the anode, and low-carbon steel as the cathode, immerse in a zinc-containing eutectic solvent heated to 50°C in a water bath for 30 minutes of constant current electroplating, in which the direct distance between the cathode and the anode is 1 cm, and the current density is 4 mA / cm 2 .

[0032] After the electroplating is completed, the low carbon steel is taken out and washed twice with double distilled water, and finally dried in an oven at 60°C.

[0033] The conductivity of betaine-urea-water deep eutectic solvent is 33.4μs cm at 50℃ -1 .

[0034] The conductivity of t...

Embodiment 2

[0036] First weigh 0.2 mol of betaine, 0.4 mol of urea, and 0.6 mol of distilled water and place them in a beaker, seal the beaker with plastic wrap, and then stir at a constant temperature of 80°C to obtain a transparent deep eutectic solvent. Then add 0.025 mol of zinc chloride, and stir at 80° C. to obtain a zinc-containing deep eutectic solvent.

[0037] Use a pure zinc plate as the anode, and low-carbon steel as the cathode, immerse in a zinc-containing eutectic solvent heated to 60°C in a water bath for 15 minutes of constant current electroplating, in which the direct distance between the cathode and the anode is 2cm, and the current density is 2mA / cm 2 .

[0038] After the electroplating is completed, the low carbon steel is taken out and washed twice with double distilled water, and finally dried in an oven at 60°C.

Embodiment 3

[0040] First weigh 0.2 mol of betaine, 0.4 mol of urea, and 0.6 mol of distilled water and place them in a beaker, seal the beaker with plastic wrap, and then stir at a constant temperature of 80°C to obtain a transparent deep eutectic solvent. Then add 0.02 mol of zinc chloride and stir at a constant temperature of 80° C. to obtain a zinc-containing deep eutectic solvent.

[0041] Use a pure zinc plate as the anode, and low-carbon steel as the cathode, immerse in a zinc-containing eutectic solvent heated to 70°C in a water bath for 15 minutes of constant current electroplating, in which the direct distance between the cathode and the anode is 1cm, and the current density is 6mA / cm 2 .

[0042] After the electroplating is completed, the low carbon steel is taken out and washed twice with double distilled water, and finally dried in an oven at 60°C.

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Abstract

The invention discloses an electrogalvanizing method based on a glycine betaine-urea-water deep-eutectic solvent and belongs to the technical field of electroplating. The method includes the steps that firstly, glycine betaine, urea and distilled water are stirred at the constant temperature to obtain a transparent deep-eutectic solvent; then zinc chloride is added into the deep-eutectic solvent for constant temperature stirring to obtain a zinc containing deep-eutectic solvent which serves as electroplating liquid; and a pure zinc board used as an anode and low-carbon steel used as a cathode are immersed into the electroplating liquid for continuous current electroplating. The deep-eutectic solvent prepared from the glycine betaine, urea and water has the characteristics that an electrochemical window is wide, the galvanization process is safe, free of toxicity and environmentally friendly, and the problem of environmental pollution occurring in the processes of borofluoride galvanization, halide galvanization and the like is solved.

Description

technical field [0001] The invention relates to an electrogalvanizing method based on a betaine-urea-water deep eutectic solvent, and belongs to the technical field of electroplating. Background technique [0002] In electro-galvanizing, the metal zinc ions in the galvanizing solution move to the cathode under the action of potential difference in the galvanizing tank to form a coating. Electrogalvanizing is widely used as a protective coating on steel materials, especially to prevent atmospheric corrosion. Traditional galvanizing methods include cyanide galvanizing and chloride galvanizing. Among them, cyanide galvanizing is seriously polluted because it contains highly toxic cyanide. Chloride galvanizing bath contains a large amount of potassium chloride, which seriously corrodes the equipment. Using betaine-urea-water deep eutectic solvent instead of aqueous solution for electro-galvanizing can reduce environmental pollution. The patent application number is 201510273...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22
CPCC25D3/22
Inventor 包全合刘立红尹孝辉
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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