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Propylene-glycol-added thiosulfate cyanide-free gold-electroplating solution and electroplating method

A kind of technology of thiosulfate, thiosulfate

Inactive Publication Date: 2016-04-13
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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  • Propylene-glycol-added thiosulfate cyanide-free gold-electroplating solution and electroplating method
  • Propylene-glycol-added thiosulfate cyanide-free gold-electroplating solution and electroplating method
  • Propylene-glycol-added thiosulfate cyanide-free gold-electroplating solution and electroplating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0039]

[0040] 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 6, the temperature is 60°C, and the electroplating time is 40min.

Embodiment 2

[0042] The formulation of the electroplating solution is as follows:

[0043]

[0044] 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 6.5, the temperature is 60°C, and the electroplating time is 35min.

Embodiment 3

[0046] The formulation of the electroplating solution is as follows:

[0047]

[0048]

[0049] 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 7, 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 propylene-glycol-added thiosulfate cyanide-free gold-electroplating solution and an electroplating method. The gold-electroplating solution comprises 10-15 g / L by gold of gold trichloride, 100-140 g / L by thiosulfate radical of thiosulfate, 78-94 g / L by sulfite radical of sulfite, 0.8-3.4 g / L of propylene glycol, 0.30-0.65 g / L of an organic phosphorus compound, and 0.05-0.14 g / L by thallium of thallium (I) salt. In the gold-electroplating solution, thiosulfate is taken as a main complexant; propylene glycol is taken as a stabilizing agent; the organic phosphorus compound is taken as an electron accelerant; thallium (I) salt is taken as a brightener; and gold trichloride is taken as main gold salt. Therefore, the obtained gold-electroplating solution is relatively good in dispersion and deep plating ability, high in cathodic current efficiency, and excellent in electroplating solution performance. Through adopting the gold-electroplating solution in an alkaline condition, a plated layer obtained through electroplating is low in porosity, high in brightness, and excellent in plating 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 cyanide-free gold plating with thiosulfate added with propylene glycol. 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 coat...

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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