Electroplating liquid for non-cyanide plating gold by thiazole and electroplating method thereof

A cyanide-free gold plating and electroplating solution technology, which is applied in the field of electroplating gold, can solve problems such as low quality of the coating, poor performance of the plating solution, and restrictions on the promotion of cyanide-free electroplating. The effect of excellent performance

Inactive Publication Date: 2014-12-24
华文蔚
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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

Method used

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  • Electroplating liquid for non-cyanide plating gold by thiazole and electroplating method thereof
  • Electroplating liquid for non-cyanide plating gold by thiazole and electroplating method thereof
  • Electroplating liquid for non-cyanide plating gold by thiazole and electroplating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The formulation of the electroplating solution is as follows:

[0032]

[0033] 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 0.2A / dm 2 ; The pH is 8, the temperature is 60°C, and the electroplating time is 40min.

Embodiment 2

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

[0036]

[0037] Plating process conditions: the pulse width of the single pulse square wave current is 0.6ms, the duty cycle is 25%, and the average current density is 0.25A / dm 2 ; The pH is 8.5, the temperature is 40°C, and the electroplating time is 35min.

Embodiment 3

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

[0040]

[0041] 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 0.5A / dm 2 ; The pH is 10, the temperature is 60°C, and the electroplating time is 20min.

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PUM

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Abstract

The invention discloses an electroplating liquid for non-cyanide plating gold by thiazole and an electroplating method thereof. The electroplating liquid comprises 8-12g/L auric chloride (measured by gold), 60-90g/L of thiazolyl compounds (measured by thiazolyl) ad 80-120 g/L citric acid alkali metal salt. According to the electroplating liquid and the preparation method thereof, the thiazolyl compounds are adopted as a complexant for gold ions and the citric acid alkali metal salt is adopted as an auxiliary complexant, the two materials act synergistically to improve complexing capacity with gold, and the auric chloride is adopted as a main salt of gold, and therefore, the electroplating liquid is good in dispersion force and deep plating capacity, high in cathode current efficiency and excellent in performance. The plated layer obtained through electroplating by using the electroplating liquid under the alkaline condition 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 for thiazole cyanide-free gold plating and an electroplating method thereof. 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 o...

Claims

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Application Information

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IPC IPC(8): C25D3/48C25D5/18
Inventor 华文蔚
Owner 华文蔚
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