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Electroplating method of cyanide-free copper-zinc electroplating solution containing ionic liquid

A technology of ionic liquid and electroplating solution, which is applied in the direction of superimposed layer plating, metal material coating process, coating, etc., can solve the problems affecting the quality of electrodeposited layer, poor solubility of metal salts, etc., and achieve golden color and binding force Good, the effect of adding a small amount

Inactive Publication Date: 2016-04-06
苏州市金星工艺镀饰有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ionic liquids have poor solubility to general metal salts, which affects the quality of electrodeposited layers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare the electroplating solution, including the components of the following mass volume concentrations: potassium pyrophosphate 200g / L, anhydrous copper sulfate 92g / L, zinc sulfate 13g / L, glycerol 29g / L, succinimide 28g / L, Nitrilotriacetic acid 26g / L, pyrophosphoric acid 100g / L, benzotriazole 10g / L and 1-ethyl-3-methylimidazole diethyl phosphate salt 95mg / L, adjust the pH to 9.7 with ammonia water.

[0029] The stainless steel workpiece is used as a cathode after grinding and polishing, alkaline degreasing, acid activation, neutralization and cleaning, and a 200nm copper layer is pre-plated on the pretreated stainless steel workpiece by sputtering. Then put it into the Hall tank filled with the above-mentioned electroplating solution, use the platinum sheet as the anode, and the distance between the cathode and the anode is 16cm, and electroplating is carried out under magnetic stirring at a speed of 200r / min, and the electroplating current is 0.1 per minute. A / dm 2...

Embodiment 2

[0032] The composition of the electroplating solution is basically similar to that of Example 1, except that the ionic liquid in Example 2 is 84.9 mg / L of 1-ethyl-3-methylimidazole dimethyl phosphate.

[0033] The pre-treatment of stainless steel workpieces is first cleaned in an alkaline cleaning solution at 50°C, then pickled at room temperature for 3 minutes, and finally rinsed with deionized water and ultrapure water. A 600nm copper layer was pre-plated on the pretreated stainless steel workpiece by evaporation. Then the stainless steel workpiece after the pretreatment is placed in the Hall tank filled with the above electroplating solution, the platinum sheet is used as the anode, the distance between the cathode and the anode is 20cm, and electroplating is carried out under magnetic stirring at a speed of 200r / min. The electroplating current is 0.2A / dm per minute 2 rate from 0A / dm 2 Linear up to 5A / dm 2 , followed by constant current deposition for 26 minutes to obtai...

Embodiment 3

[0036] The electroplating solution includes the following components in mass volume concentration: potassium pyrophosphate 160g / L, anhydrous copper sulfate 72g / L, zinc sulfate 10g / L, glycerin 20g / L, succinimide 20g / L, ammonia tris Acetic acid 23g / L, pyrophosphoric acid 100g / L, benzotriazole 8g / L and 1,3-diethylimidazole dimethyl phosphate 52mg / L, use ammonia water to adjust the pH to 9.1, and the temperature of the electroplating solution is controlled at 20 -40°C.

[0037] The pre-treatment of stainless steel workpieces is first cleaned in an alkaline cleaning solution at 50 °C, then pickled at room temperature for 2 minutes, and finally rinsed with deionized water and ultrapure water. A 760nm copper layer was pre-plated on the pretreated stainless steel workpiece by evaporation. Place the stainless steel workpiece after pre-plating copper as the cathode in the above electroplating solution, graphite as the anode, keep the temperature of the electroplating solution at 25°C, ...

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Abstract

The invention discloses an electroplating method of a cyanide-free copper-zinc electroplating solution containing an ionic liquid. The electroplating method comprises the following steps: (1) preparation of the cyanide-free copper-zinc electroplating solution; (2) pretreatment of a stainless steel workpiece; (3) copper pre-plating; (4) copper-zinc alloy electroplating; and (5) after-treatment. The electroplating method provided by the present invention solves the problem of poor solubility between metal ions and the ionic liquid; the electroplating solution contains the ionic liquid additive and thus is non-toxic and pollution-free, and low in energy consumption; meanwhile, due to a relatively low quantity of the added ionic liquid, no production cost is increased; the electroplating method can be used within a relatively wide current density range; and a coating obtained through electroplating under a continuously increased current density is golden yellow, continuous and even, and compact, and further good in binding force with a substrate, and resistant to high temperatures and abrasion.

Description

technical field [0001] The invention relates to the field of electroplating, in particular to an electroplating method for a cyanide-free copper-zinc electroplating solution containing an ionic liquid for making coins. Background technique [0002] Gold plating is widely used in decorative plating. However, the application of pure gold electroplating is limited due to the high price, low hardness and poor wear resistance of gold. The golden color of the imitation gold coating can meet the decorative requirements, the hardness and wear resistance of the coating are greatly improved, and its cost is low. It is mostly used for decorative plating on jewelry, handicraft products, lamps, buttons, watches, lighters and other parts. It has obvious economic benefits and broad development prospects. Imitation gold (copper-zinc alloy) electroplating mostly uses cyanide electroplating, the coating has fine crystallization, good dispersion and covering ability of the plating solution, ...

Claims

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Application Information

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IPC IPC(8): C25D3/66C25D5/18C23C28/02
CPCC25D3/665C23C28/021C25D5/18
Inventor 冯正元冯育华
Owner 苏州市金星工艺镀饰有限公司
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