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Cyanide-free gold-cobalt alloy electroplating liquid and electroplating method thereof

A technology of electroplating solution and cobalt alloy, which is applied in the field of alloy electroplating solution, which can solve the problems of environmental and human hazards, easy burning of the plating solution, etc., and achieve the effect of good stability, not easy to darken, and bright color

Inactive Publication Date: 2016-02-10
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

[0003] Purpose of the invention: In order to overcome the defects in the prior art, the present invention provides a cyanide-free gold-cobalt alloy electroplating solution to solve the problem of harm to the environment and human body and the problem that the plating solution is easy to burn during high-current electroplating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 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, ultrasonic washing, pickling, washing and then drying. Put the pretreated plated parts into the electroplating solution as the working electrode, the platinum sheet as the anode, and set the current density to 2.5A / dm 2 , The composition of the electroplating solution includes: chloroauric acid 25g / L, 2-thio-5,5-dimethylhydantoin 110g / L, succinimide 30g / L, ammonium citrate 80g / L, Citric acid 55g / L, isonicotinic acid 35g / L, antimony potassium tartrate 2g / L, polyethylene glycol 1g / L, sodium sulfite 120g / L and cobalt sulfate heptahydrate 4g / L, the pH of the electroplating solution is adjusted to 5.4. The temperature of the electroplating solution is 25°C. During the electroplating process, the solution pump is used to circulate and stir. The electroplating time i...

Embodiment 2

[0016] The basic operation is the same as in Example 1, except that the amount of cobalt sulfate heptahydrate added is 2g / L. The gold-cobalt coating obtained in this embodiment has a bright golden color, good coating uniformity, no burnt area, and good wear resistance.

Embodiment 3

[0018] Basic operation is the same as embodiment 1, difference is: the addition of chloroauric acid is 15g / L, and the addition of cobalt sulfate heptahydrate is 1g / L. The gold-cobalt coating obtained in this embodiment has a bright golden color, good coating uniformity, no burnt area, and good wear resistance.

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PUM

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Abstract

The invention belongs to the field of alloy electroplating liquids, and discloses a cyanide-free gold-cobalt alloy electroplating liquid and an electroplating method thereof. The electroplating liquid comprises the following components with massic volume concentrations: 10-30g / L of chloroauric acid, 110-120g / L of 2-sulpho-5,5-dimethyl hydantoin, 10-30g / L of succinimide, 40-100g / L of ammonium citrate, 30-70g / L of citric acid, 20-40g / L of isonicotinic acid, 1-3g / L of antimony potassium tartrate, 0.5-2g / L of polyethylene glycol, 20-150g / L of sodium sulphite and 1-5g / L of cobalt sulphate hepathydrate, wherein the pH value is adjusted to 4.5-6 by virtue of citric acid, and the temperature of the electroplating liquid is 20-55 DEG C. During an electroplating process, the pre-treated plated parts are electroplated by virtue of a high-density current, and the obtained products are excellent in wear resistance, bright in colour, and not liable to darken; and base metal layers are not liable to diffuse to alloy plating layers. Besides, burning phenomenon is avoided and good repeatability is realized.

Description

technical field [0001] The invention belongs to the field of alloy electroplating solutions, and in particular relates to a cyanide-free gold-cobalt alloy electroplating solution and an electroplating method thereof. Background technique [0002] The gold coating has strong corrosion resistance, good ductility, easy polishing, high temperature resistance, stable chemical properties, and certain wear resistance. As a decorative coating, gold plating is also used in electroplated jewelry, medals (coins) or handicrafts. Such products have certain ornamental value and collection value, and they will inevitably be bumped and scratched in daily life, affecting their appearance. Gold-cobalt alloy is a common hard alloy with high wear resistance and low surface friction coefficient. Gold-cobalt alloy plating is often used to prepare printed boards or electrical connectors. The gold salt in the traditional electroplating solution is mostly cyanide-containing gold salt, which is harm...

Claims

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Application Information

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IPC IPC(8): C25D3/62
CPCC25D3/62
Inventor 冯正元冯育华
Owner 苏州市金星工艺镀饰有限公司