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Arsenic-contained sulfite cyanide-free plated gold electroplating liquid and electroplating method

A sulfite, cyanide-free gold plating technology, applied in the field of copper-tin electroplating, can solve the problems that restrict the promotion of cyanide-free gold plating, the quality of the coating is not high, the performance of the plating solution is poor, and the performance of the plating solution is excellent and the brightness is high. , The effect of good coating quality

Inactive Publication Date: 2016-02-03
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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  • Arsenic-contained sulfite cyanide-free plated gold electroplating liquid and electroplating method
  • Arsenic-contained sulfite cyanide-free plated gold electroplating liquid and electroplating method
  • Arsenic-contained sulfite cyanide-free plated gold electroplating liquid and electroplating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The formulation of the electroplating solution is as follows:

[0036]

[0037] 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

[0039] The formulation of the electroplating solution is as follows:

[0040]

[0041]

[0042] 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

[0044] The formulation of the electroplating solution is as follows:

[0045]

[0046] 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

The invention discloses arsenic-contained sulfite cyanide-free plated gold electroplating liquid and an electroplating method. The electroplating liquid comprises 10-15 g / L of gold trichloride calculated by gold, 78-94 g / L of sulfite calculated by sulfurous acid radical, 9-16 g / L of nitrophenol and 0.16-0.48 g / L of arsenic trichloride. The electroplating liquid uses the sulfite as a main coordination agent, the nitrophenol as a stable positioning agent, the arsenic trichloride as a brightening agent and the gold trichloride as gold main salt, so that the electroplating liquid is better in dispersibility and deep plating capacity, high in cathode current efficiency and excellent in plating liquid performance. A plating layer electroplated by the plating liquid under the alkaline condition is low in porosity, high in brightness and excellent 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 and an electroplating method for arsenic-containing sulfite 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 co...

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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