Glucosaminic-acid cyanide-free gold-plating electroplating liquid and electroplating method thereof

A technology of glucosamine and glucosamine, which is applied in the field of electroplating solution for cyanide-free gold plating with glucosamine, which can solve problems such as low quality of plating layer, restrictions on the promotion of cyanide-free electroplating, poor performance of plating solution, etc., and achieve high brightness , excellent performance of plating solution and good coating quality

Inactive Publication Date: 2016-03-30
无锡杨市表面处理科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing cyanide electroplating generally has the technical defects of poor performance of the plating solution and low coating quality, which seriously restrict the further promotion of cyanide-free electroplating in industry

Method used

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  • Glucosaminic-acid cyanide-free gold-plating electroplating liquid and electroplating method thereof
  • Glucosaminic-acid cyanide-free gold-plating electroplating liquid and electroplating method thereof
  • Glucosaminic-acid cyanide-free gold-plating electroplating liquid and electroplating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The formulation of the electroplating solution is as follows:

[0033]

[0034] Plating process conditions: the pulse width of single pulse square wave current is 0.5ms, the duty cycle is 30%, and the average current density is 0.5A / dm 2 ; The pH is 4, the temperature is 60°C, and the electroplating time is 40min.

Embodiment 2

[0036] The formulation of the electroplating solution is as follows:

[0037]

[0038] Plating process conditions: the pulse width of single pulse square wave current is 0.6ms, the duty cycle is 25%, and the average current density is 0.6A / dm 2 ; The pH is 4.5, the temperature is 60°C, and the electroplating time is 35min.

Embodiment 3

[0040] The formulation of the electroplating solution is as follows:

[0041]

[0042] Plating process conditions: the pulse width of single pulse square wave current is 0.8ms, the duty cycle is 20%, and the average current density is 1A / dm 2 ; The pH is 5, the temperature is 50° C., and the electroplating time is 20 minutes.

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PUM

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Abstract

The invention discloses a glucosaminic-acid cyanide-free gold-plating electroplating liquid and an electroplating method thereof. The electroplating liquid comprises 10-15 g/L of gold trichloride calculated based on gold, 80-104 g/L of a glucosaminate, 32-60 g/L of iminodiacetic acid and 1-5 g/L of glycine. The glucosaminate is taken as a coordinating agent, iminodiacetic acid is taken as an auxiliary coordinating agent, and the glucosaminate and iminodiacetic acid give play to synergic effect for improving the gold coordinating capability. Glycine is taken as a stabilizing agent and prevents the electroplating liquid from being oxidized under an acidic condition. Gold trichloride is taken as a gold main salt, and thus the obtained electroplating liquid possesses relatively good dispersing force and covering power, and is high in cathode current efficiency and excellent in performances. A plating layer obtained by employing the electroplating liquid for performing electroplating under an alkaline condition is low in porosity, high in brightness and good in plating-layer quality.

Description

technical field [0001] The invention relates to the technical field of copper-tin electroplating, in particular to an electroplating solution for cyanide-free gold plating with glucosamine and an electroplating method thereof. Background technique [0002] Gold has good ductility, is easy to polish, has low contact resistance, good conductivity and welding performance, and has been widely used as a solderable coating in the electronics industry. Gold is resistant to high temperatures, and hard gold is relatively wear-resistant, so gold plating is widely used in precision instruments, meters, printed circuit boards, integrated circuits, tube shells, electrical contacts and other parts that require long-term stable electrical parameters. Gold has high chemical stability and is only soluble in aqua regia but not in other acids. Therefore, the gold coating has strong corrosion resistance and good anti-tarnish performance. At the same time, the gold alloy coating has various colo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/48C25D5/18
Inventor 潘增炎
Owner 无锡杨市表面处理科技有限公司
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