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

A technology for cyanide-free gold plating and electroplating solution, applied in the field of gold electroplating, can solve the problems that restrict the promotion of cyanide-free gold electroplating, the quality of the coating layer is not high, the performance of the plating solution is poor, and the performance of the plating solution is excellent, the brightness is high, and the coating layer good quality results

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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  • Glutamic-acid cyanide-free gold-plating electroplating liquid and electroplating method thereof
  • Glutamic-acid cyanide-free gold-plating electroplating liquid and electroplating method thereof
  • Glutamic-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 the single pulse square wave current is 0.5ms, the duty cycle is 30%, and the average current density is 0.4A / 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 0.5A / 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 the single pulse square wave current is 0.8ms, the duty cycle is 20%, and the average current density is 0.8A / dm 2 ; The pH is 5, the temperature is 50° C., and the electroplating time is 20 minutes.

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Abstract

The invention discloses a glutamic-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, 60-115 g / L of glutamic acid, 24-46 g / L of quinaldinic acid and 2-6 g / L of glycine. Glutamic acid is employed as a coordination agent and quinaldinic acid is employed as an auxiliary coordination agent, glutamic acid and quinaldinic acid give play to synergic effect for improving the coordination capability of gold. Glycerin is employed as a stabilizing agent and prevents the electroplating liquid from being oxidized under an acidic condition. Gold trichloride is employed 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 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 gold electroplating, in particular to a glutamic acid cyanide-free gold plating electroplating solution and an electroplating method. 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 colors, so it is often use...

Claims

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Application Information

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IPC IPC(8): C25D3/48
Inventor 潘增炎
Owner 无锡杨市表面处理科技有限公司
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