Plating solution for mercapto sulfonic acid non-cyanogen gold plating and plating method thereof

A technology of mercaptosulfonic acid and cyanide-free gold plating, which is applied in the field of electroplating gold tin, can solve problems such as low quality of plating, restrictions on the promotion of cyanide-free electroplating, and poor performance of the plating solution, achieving high brightness and excellent performance of the plating solution , the effect of good coating quality

Inactive Publication Date: 2016-04-06
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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  • Plating solution for mercapto sulfonic acid non-cyanogen gold plating and plating method thereof
  • Plating solution for mercapto sulfonic acid non-cyanogen gold plating and plating method thereof
  • Plating solution for mercapto sulfonic acid non-cyanogen gold plating and plating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The formulation of the electroplating solution is as follows:

[0034]

[0035] 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

[0037] The formulation of the electroplating solution is as follows:

[0038]

[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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PUM

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Abstract

The invention discloses a plating solution for mercapto sulfonic acid non-cyanogen gold plating and a plating method thereof. The plating solution comprises 10-15g / L of gold trichloride calculated by gold, 35-55g / L mercapto sulfonic acid compound calculated by mercapto group, 11-17g / L citric acid and salts thereof calculated by citrate, and 50-70g / L EDTA. The plating solution uses mercapto sulfonic acid compound as the main complexing agent, uses citric acid and its salts, and EDTA as the auxiliary complexing agent, and uses gold trichloride as the main gold salt, so that the obtained plating solution has good dispersion force, deep plating capability power, high cathodic current efficiency, and excellent performance. The plating layer obtained under basic conditions by using the plating solution has the advantages of low porosity, high brightness and good plating layer quality.

Description

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