Color-change-preventing cyanide-free silver plating electroplating liquid and electroplating method thereof

A cyanide-free silver plating and electroplating solution technology, applied in the field of alloy electroplating solution, can solve the problems of poor stability of the plating solution, easy discoloration of the coating, narrow current density range, etc., and achieves good stability, excellent coverage and good leveling ability. Effect

Inactive Publication Date: 2016-03-23
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

[0005] Purpose of the invention: In order to overcome the defects in the prior art, the present invention provides an anti-tarnish silver plating solution and its electroplating method to solve the problem of poor stability of the solution, narrow range of current density and easy discoloration of the coating in the existing cyanide-free silver plating system. technical issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, pretreat the substrate of the plated part according to the conventional pretreatment method. The substrate of the plated part is copper or copper alloy. The pretreatment includes organic solvent degreasing, alkaline solution degreasing, drying or drying after washing; Including NaOH10g / L, Na 2 CO 3 45g / L, Na 3 PO 4 40g / L, Na 2 SiO 3 8g / L. Put the pretreated plated parts into the electroplating solution as the working electrode. The components of the electroplating solution include: silver nitrate 38g / L, 2-thio-5,5-dimethylhydantoin 110g / L, butane di Imide 15g / L, sodium pyrophosphate 40g / L, pyrophosphate 30g / L, methionine 35g / L, polyethylene glycol 0.5g / L, benzotriazole 4g / L, nonylphenol polyoxyethylene lauryl ether 2g / L and sodium sulfite 50g / L, the pH of the electroplating solution was adjusted to 4.7 with pyrophosphoric acid, and the temperature of the electroplating solution was 30°C. The platinum sheet is the anode, the distance between the anode and t...

Embodiment 2

[0018] Other operating conditions are the same as Example 1, and the difference is that the electroplating solution comprises the following components in mass volume concentration: silver nitrate 50g / L, 2-thio-5, 5-dimethylhydantoin 120g / L, butanediol Imide 30g / L, sodium pyrophosphate 100g / L, pyrophosphate 60g / L, methionine 52g / L, polyethylene glycol 2g / L, benzotriazole 10g / L, nonylphenol polyoxyethylene lauryl ether 8g / L and sodium sulfite 150g / L, the pH of the plating solution was adjusted to 5 with pyrophosphoric acid, the temperature of the plating solution was 30°C, the anode was a silver plate, the distance between the anode and the working electrode was 15cm, and the current density was set to 2A / dm 2 , electroplating for 30 minutes, after the electroplating is completed, wash with deionized water, air dry and pack separately. The silver-plated layer obtained in this example is silver-white and bright, dense and flat, and has strong anti-discoloration ability. After re...

Embodiment 3

[0020] Other basic operating conditions are the same as in Example 1, and the difference is that the electroplating solution includes the following components in mass volume concentration: silver nitrate 43g / L, 2-thio-5, 5-dimethylhydantoin 118g / L, butyrate Diimide 30g / L, sodium pyrophosphate 70g / L, pyrophosphate 55g / L, methionine 52g / L, polyethylene glycol 1g / L, benzotriazole 8g / L, nonylphenol polyoxyethylene lauryl ether 8g / L and sodium sulfite 130g / L, the pH of the electroplating solution was adjusted to 5 with pyrophosphoric acid, the temperature of the electroplating solution was 25°C, the anode was a silver plate, the distance between the anode and the working electrode was 8cm, the electroplating was 25min, and the current density was set to 1A / dm 2 After the electroplating is completed, they are washed with deionized water, air-dried and packaged separately. The silver-plated layer obtained in this example is silver-white and bright, dense and flat, and has strong ant...

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PUM

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Abstract

The invention discloses color-change-preventing cyanide-free silver plating electroplating liquid and an electroplating method thereof. The electroplating liquid comprises, by mass volume concentration, 38-50 g/L of silver nitrate, 110-120 g/L of 2-sulpho-5,5-dimethyl hydantoin, 10-30 g/L of succinimide, 40-100 g/L of sodium pyrophosphate, 30-70 g/L of pyrophosphoric acid, 35-55 g/L of methionine, 0.5-2 g/L of polyethylene glycol, 4-10 g/L of benzotriazole, 1-8 g/L of nonylphenol polyoxyethylene laurel ether and 20-150 g/L of sodium sulfite. The pyrophosphoric acid is used for adjusting the pH to range from 3 to 5, and the temperature of the electroplating liquid ranges from 20 DEG to 55 DEG C. According to the color-change-preventing cyanide-free silver plating electroplating liquid and the electroplating method thereof, the combining force between a silver plating layer obtained through the electroplating method and a plating part base material is good, the leveling capability is good, the covering capability is excellent, the color is bright and not likely to become dark, an intermediate layer does not need to be pre-plated on the surface of the base material, the electroplating liquid can be used in a wide current range, and repeatability is good.

Description

technical field [0001] The invention belongs to the field of alloy electroplating solutions, and in particular relates to an anti-discoloration silver-plating electroplating solution and an electroplating method thereof. Background technique [0002] Metallic silver has become one of the most widely used precious metals due to its excellent performance and low cost, especially its unique silver-white metallic luster, which is often used as a decorative layer in household high-end appliances, handicrafts and jewelry. Sulfur dioxide or hydrogen sulfide in the air tends to react slowly with the silver coating, causing the silver coating to change color and darken. Usually, it needs to undergo post-plating treatment, mainly dipping, chemical and electrochemical passivation, coating, etc. [0003] Because of the good stability of the plating solution, the cyanide silver plating process is currently mostly based on the cyanide system, which seriously endangers the human body and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/46C25D5/00
CPCC25D3/46C25D5/00
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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