Cyanide-free gold electroplating solution and electroplating process thereof

A cyanide-free gold plating and electroplating solution technology, which is applied in the field of electroplating, can solve problems such as the stability of the plating solution or the lack of coating quality, and restrictions on popularization and application, and achieve the effects of improving electroplating efficiency, stability, and good corrosion resistance

Pending Publication Date: 2020-09-25
山东鲁蓝环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above cyanide-free electroplating technology is more or less lacking in the stability of the plating solution or the quality of the coating, so it is subject to certain restrictions in popularization and application.

Method used

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  • Cyanide-free gold electroplating solution and electroplating process thereof
  • Cyanide-free gold electroplating solution and electroplating process thereof
  • Cyanide-free gold electroplating solution and electroplating process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A kind of cyanide-free gold plating electroplating solution, described electroplating solution comprises main complexing agent 30g / L, conductive salt 10g / L, carbonate 20g / L, other additive 0.1g / L, tetrachloroauric acid 1g / L, stable Agent 0.1g / L; Described stabilizer is prepared by following method:

[0033] (1) Weigh 9g of ethylenediaminetetraacetic acid, 20mL of pyridine, and 15mL of acetic anhydride and place them in a flask in sequence. The reaction temperature is 65°C, and they are stirred for 24 hours under a nitrogen atmosphere. Washing, then drying in a vacuum oven, the product is stored in a desiccator;

[0034] (2) Take 5g of chitosan and dissolve it in acetic acid with a volume fraction of 3%, weigh 5g of the product obtained in step (1) and add it to methanol, then place the two in a flask and react with mechanical stirring at 30°C After 24 hours of reaction, wash with 100 mL of 0.1 mol / L NaOH solution, distilled water, 0.1 mol / L HCl solution, distilled wate...

Embodiment 2

[0053] A kind of cyanide-free gold plating electroplating solution, described electroplating solution comprises main complexing agent 80g / L, conductive salt 90g / L, carbonate 60g / L, other additive 8g / L, tetrachloroauric acid 10g / L, stabilizer 0.5g / L; Described stabilizer is prepared by following method:

[0054] (1) Weigh 9g of ethylenediaminetetraacetic acid, 20mL of pyridine, and 15mL of acetic anhydride and place them in a flask in sequence. The reaction temperature is 65°C, and they are stirred for 24 hours under a nitrogen atmosphere. Washing, then drying in a vacuum oven, the product is stored in a desiccator;

[0055] (2) Take 5g of chitosan and dissolve it in acetic acid with a volume fraction of 3%, weigh 5g of the product obtained in step (1) and add it to methanol, then place the two in a flask and react with mechanical stirring at 30°C After 24 hours of reaction, wash with 100 mL of 0.1 mol / L NaOH solution, distilled water, 0.1 mol / L HCl solution, distilled water, ...

Embodiment 3

[0075] A kind of cyanide-free gold plating electroplating solution, described electroplating solution comprises main complexing agent 80g / L, conductive salt 90g / L, carbonate 60g / L, other additive 8g / L, tetrachloroauric acid 10g / L, stabilizer 0.5g / L; Described stabilizer is prepared by following method:

[0076] (1) Weigh 9g of ethylenediaminetetraacetic acid, 20mL of pyridine, and 15mL of acetic anhydride and place them in a flask in sequence. The reaction temperature is 65°C, and they are stirred for 24 hours under a nitrogen atmosphere. Washing, then drying in a vacuum oven, the product is stored in a desiccator;

[0077] (2) Take 5g of chitosan and dissolve it in acetic acid with a volume fraction of 3%, weigh 5g of the product obtained in step (1) and add it to methanol, then place the two in a flask and react with mechanical stirring at 30°C After 24 hours of reaction, wash with 100 mL of 0.1 mol / L NaOH solution, distilled water, 0.1 mol / L HCL solution, distilled water, ...

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Abstract

The invention discloses a cyanide-free gold electroplating solution and an electroplating process thereof, and belongs to the technical field of electroplating. The electroplating solution disclosed by the invention comprises 30-120 g / L of main complexants, 10-150 g / L of conductive salt, 20-80 g / L of carbonates, 0.1-15 g / L of other additives, 1-20 g / L of chloroauric acid and 0.1-1.0 g / L of stabilizers. According to the cyanide-free gold electroplating solution, hydantoin derivatives are used as the main complexants, and sulfites and tartrate are used as conductive salt; and then the stabilizers are added. In the electroplating process, complex gold ions can be adsorbed by the stabilizers effectively, and the stability of the electroplating solution is improved greatly; meanwhile, the effective coordination between the gold ions and the hydantoin derivatives can be promoted, and the electroplating efficiency is improved effectively. A gold plating prepared with the electroplating solution is fine in crystal, and high in binding force and corrosion resistance, and the electroplating solution is nontoxic, and high in stability, dispersibility and covering ability. Cyanide gold platingsolution can be replaced with the gold electroplating solution, and the gold electroplating solution has broad development prospects.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and in particular relates to a cyanide-free gold plating electroplating solution and an electroplating process thereof. Background technique [0002] Precious metal electroplating has developed rapidly since its development. Gold plating is widely used in jewelry, Watches, handicrafts and electronic components and other fields. [0003] At present, the gold electroplating technology adopts the cyanide gold plating process. Although the cyanide gold plating has the advantages of stable plating solution and excellent coating performance, CN - It is highly toxic, which will not only cause serious pollution to the environment, but also pose a serious threat to the health of production operators. At the same time, cyanide also has many hidden dangers in transportation, storage and other links. In order to realize the protection of the environment and the green and sustainable development of t...

Claims

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Application Information

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IPC IPC(8): C25D3/48C25D5/12
CPCC25D3/48C25D5/12
Inventor 浦建堂叶仁祥孙卫东刘建祥
Owner 山东鲁蓝环保科技有限公司
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