Multi-coordination-agent cyanide-free electrogilding liquid and electrogilding process

A gold electroplating and multi-coordination technology, applied in the field of gold electroplating, can solve the problems of popularization and application limitations, and achieve the effects of high current efficiency, wide range of current density, excellent bath performance and coating performance

Active Publication Date: 2014-04-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing cyanide-free electroplating technology has some disadvantages more or less, which limits its popularization and application.

Method used

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  • Multi-coordination-agent cyanide-free electrogilding liquid and electrogilding process
  • Multi-coordination-agent cyanide-free electrogilding liquid and electrogilding process

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specific Embodiment approach 1

[0017] Specific embodiment one: The multi-coordinating agent cyanide-free electroplating gold plating solution in this embodiment uses hydantoin derivatives as the main complexing agent, and weighs 5-115 g / L of potassium hydroxide and 10-150 g / L of hydantoin derivatives. L. Mix 10-100g / L auxiliary complexing agent to completely dissolve the mixed complexing agent to obtain a solution of complex complexing agent, add potassium carbonate 5-150g / L to make a conductive salt, and adjust the pH value at 7 with potassium hydroxide Between ~13, weigh 1~80g / L of potassium gold chloride, dissolve the potassium gold chloride and add it to the previously prepared compound complexing agent solution to form the basic solution for electroplating gold, and add combined additives, the amount of which is 0.1~100mL / L, control the temperature at 20~75℃, stir for 0.1~24h. The plating solution is prepared with ultrapure water with a resistivity of 18MΩ / cm.

[0018] The electroplating process in th...

specific Embodiment approach 2

[0028] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the electroplating process of electroplating gold is: constant current electroplating method, and the current density is 0.5A / dm 2 , the distance between the cathode and the anode is 5cm, the temperature is 55°C, and the plating time is 10min. Electroplating gold bath composition: 1,3-dimethylol-5,5-dimethylhydantoin 45g / L, hypoxanthine 2g / L, potassium hydroxide 15g / L, potassium carbonate 25g / L, Potassium gold chloride 10g / L, combined additive 20mL / L, described combined additive consists of: antimony potassium tartrate 10g / L, polyethylene glycol 5g / L, guanine 5g / L, succinimide 5g / L . Adjust the pH of the plating solution to 10. During the preparation of the plating solution, control the temperature at 60° C. and stir for 20 hours. In the electroplating process, an inert metal electrode is used as the anode. A gold-plated layer with macroscopic golden yellow and full bright...

specific Embodiment approach 3

[0029] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the electroplating gold plating solution consists of: 1,3-dibromo-5,5-dimethylhydantoin 35g / L, potassium citrate 15g / L, potassium hydroxide 12g / L, potassium carbonate 28g / L, gold potassium chloride 14g / L, combined additive 85mL / L, described combined additive consists of: potassium selenite 5g / L, saccharin 10g / L , 1,4-butynediol 5g / L, sodium lauryl sulfate 1g / L. Adjust the pH of the plating solution to 10. During the preparation of the plating solution, control the temperature at 65° C. and stir for 15 hours. After electrolytic degreasing, pickling with 1:1 HCl aqueous solution, electroplating nickel intermediate layer and water washing, the copper sheet is used as the cathode, and the inert metal electrode is used as the anode. Density 2.0A / dm 2 , stirred properly, and the electroplating time was 3 minutes, to obtain a gold-plated layer with a macroscopic golden color...

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Abstract

The invention relates to multi-coordination-agent cyanide-free electrogilding liquid and an electrogilding process, which belong to the technical field of electrogilding. The electrogilding liquid is prepared from a main coordination agent, an auxiliary coordination agent, potassium hydroxide, potassium carbonate, goldpotassium chloride, combined additives and ultrapure water. The electrogilding process comprises the following steps: 1, preprocessing a substrate; 2, electroplating an intermediate nickel plating layer; 3, electrogilding, namely washing the substrate after electroplating the intermediate nickel plating layer with ultrapure water, directly feeding the substrate into a plating cell containing the multi-coordination-agent cyanide-free electrogilding liquid to be electrogilded, taking out a sample from the electrogilding liquid after the electrogilding, washing the surface of the sample by utilizing distilled water, and drying the sample through cold air. Double coordination agents are used as the coordination agents of gold ions in the electrogilding liquid, so that a cyanide-free electrogilding system which has high current efficiency, smoothness and compactness in plating layer crystallization, wide current density range, wide temperature requirement and capability of guaranteeing the golden bright appearance of the plating layer compared with those of a single coordination agent system is obtained.

Description

technical field [0001] The invention belongs to the technical field of electroplating gold, and relates to a multi-coordination agent cyanide-free electroplating gold system and an electroplating gold process. Background technique [0002] Gold is widely used in electronics, instruments, instruments, aviation, aerospace and other industrial fields because of its good electrical conductivity, good weldability, low contact resistance, high temperature resistance, and wear resistance. Gold also has high chemical stability, good corrosion resistance and discoloration resistance, so decorative gold plating is widely used in various aspects, such as jewelry, handicrafts, medals, commemorative coins, high-end tableware, etc. [0003] Traditional electroplating uses cyanide gold plating solution, but as we all know, CN - It is highly toxic and will cause great harm to electroplating workers and the environment. Therefore, in order to implement sustainable development, realize envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/48
Inventor 安茂忠任雪峰杨培霞宋英刘安敏
Owner HARBIN INST OF TECH
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