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A heterocyclic thiol cyanide-free gold electroplating solution and an electroplating method

A cyanide-free gold plating and heterocyclic mercaptan technology, which is applied in the field of copper-tin electroplating, can solve the problems of low plating quality, poor plating solution performance, and restrictions on the promotion of cyanide-free gold plating, and achieve high brightness and good plating quality , the effect of excellent bath performance

Inactive Publication Date: 2016-03-02
无锡永发电镀有限公司
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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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  • A heterocyclic thiol cyanide-free gold electroplating solution and an electroplating method
  • A heterocyclic thiol cyanide-free gold electroplating solution and an electroplating method
  • A heterocyclic thiol cyanide-free gold electroplating solution and an electroplating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The formulation of the electroplating solution is as follows:

[0035]

[0036] 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 8, the temperature is 60°C, and the electroplating time is 40min.

Embodiment 2

[0038]The formulation of the electroplating solution is as follows:

[0039]

[0040]

[0041] 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 8.5, the temperature is 60°C, and the electroplating time is 35min.

Embodiment 3

[0043] The formulation of the electroplating solution is as follows:

[0044]

[0045] 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 9, the temperature is 50° C., and the electroplating time is 20 minutes.

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PUM

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Abstract

A heterocyclic thiol cyanide-free gold electroplating solution and an electroplating method are disclosed. The electroplating solution comprises gold trichloride with a concentration of 10-15 g / L based on gold, heterocyclic thiol with a concentration of 35-55 g / L based on the thiol group, 0.20-0.58 g / L of an alcohol amine compound and 0.08-0.22 g / L of antimony trioxide. The heterocyclic thiol is adopted as a main coordination agent, the alcohol amine compound is adopted as an electron accelerator, the antimony trioxide is adopted as a brightener and the gold trichloride is adopted as a main gold salt. The electroplating solution is good in dispersion force and deep plating capability, high in cathode current efficiency and excellent in performance. A plating layer obtained by electroplating by adopting the electroplating solution under alkaline conditions is low in porosity, high in brightness and good in quality.

Description

technical field [0001] The invention relates to the technical field of copper-tin electroplating, in particular to an electroplating solution and an electroplating method for heterocyclic thiol cyanide-free gold plating. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/48C25D5/18
Inventor 石明
Owner 无锡永发电镀有限公司
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