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Aromatic mercaptan cyanide-free gilding electroplating solution and method

Inactive Publication Date: 2016-02-17
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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  • Aromatic mercaptan cyanide-free gilding electroplating solution and method
  • Aromatic mercaptan cyanide-free gilding electroplating solution and method
  • Aromatic mercaptan cyanide-free gilding electroplating solution and 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] 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

[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 0.8ms, 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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Abstract

The invention discloses an aromatic mercaptan cyanide-free gilding electroplating solution and method. The electroplating solution comprises 10 g / L to 15 g / L of auric chloride by gold, 35 g / L to 55 g / L of aromatic mercaptan by sulfydryl, 0.10 g / L to 0.35 g / L of a dipyridyl compound and 0.30 g / L to 0.60 g / L of selenite by selenious acid radical. The aromatic mercaptan serves as a main coordination agent, the dipyridyl compound serves as an electron acceleration agent, the selenite serves as a brightening agent, and the auric chloride serves as main auric salt, so that the obtained electroplating solution has the good dispersion force and the deep-plating capacity, cathode current efficiency is high, and the performance of the electroplating solution is excellent. The electroplating solution is adopted for electroplating under the alkaline condition, so that an obtained plated layer is low in porosity, high in brightness and good in quality.

Description

technical field [0001] The invention relates to the technical field of electroplating gold, in particular to an electroplating solution and an electroplating method for aromatic 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 it is oft...

Claims

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Application Information

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IPC IPC(8): C25D3/48C25D5/18
Inventor 石明
Owner 无锡永发电镀有限公司
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