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Thiosulfate silvering plating solution

A technology of thiosulfate and sodium thiosulfate, which is applied in the field of silver plating technology, can solve the problems of poor discoloration resistance of the plating layer, insufficient stability of the plating solution, and unsatisfactory weldability, etc., and achieve strong discoloration resistance and weldability , good stability

Inactive Publication Date: 2015-04-15
WUXI HUAYE IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing thiosulfate silver plating solution has the technical defects that the solution is not stable enough, the coating has poor discoloration resistance and solderability is not ideal

Method used

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  • Thiosulfate silvering plating solution
  • Thiosulfate silvering plating solution
  • Thiosulfate silvering plating solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The formula of thiosulfate silver plating electroplating solution is as follows:

[0038]

[0039] Plating process conditions: the pulse width of the square wave pulse current is 1ms, the duty cycle is 5%, and the average current density is 0.3A / dm 2 ; The pH is 9, the temperature is 15°C, and the electroplating time is 30min.

Embodiment 2

[0041] The formula of thiosulfate silver plating electroplating solution is as follows:

[0042]

[0043] Plating process conditions: the pulse width of the square wave pulse current is 2ms, the duty cycle is 10%, and the average current density is 0.35A / dm 2 ; The pH is 9.5, the temperature is 20°C, and the electroplating time is 40min.

Embodiment 3

[0045] The formula of thiosulfate silver plating electroplating solution is as follows:

[0046]

[0047] Plating process conditions: the pulse width of the square wave pulse current is 2.5ms, the duty cycle is 15%, and the average current density is 0.40A / dm 2 ; The pH is 10, the temperature is 25°C, and the electroplating time is 45min.

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PUM

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Abstract

The invention discloses a thiosulfate silvering plating solution and an electroplating method. The thiosulfate silvering plating solution includes: 40-50g / L silver nitrate, 230-250g / L thiosulfate, 45-65g / L carbonate, 40-50g / L of pyrosulfite, 2-3g / L citrazinic acid, 0.3-0.5g / L thiosemicarbazide and 0.1-0.2g / L triethanolamine. According to the technical scheme of the invention, thiosemicarbazide is selected as the anode activator, the citrazinic acid, thiosemicarbazide and triethanolamine are compounded to serve as the brightener, the plating solution can have good stability, and the coating has strong color change resistance and weldability.

Description

technical field [0001] The invention relates to the technical field of silver plating technology, in particular to a thiosulfate silver plating electroplating solution. Background technique [0002] Metal silver has become one of the most widely used precious metals due to its excellent performance and relatively low cost. Among all metals, silver has the best conductivity, and it has good thermal conductivity, ductility, light reflection, corrosion resistance and welding performance. Therefore, it is in great demand in electronics, communications and other industrial fields. In addition, because of its unique silver-white metallic luster, silver has been used as a decorative layer on handicrafts such as high-end household utensils, tableware and jewelry. However, silver is a precious metal after all, and the actual application cost is relatively high, and its content in the earth's crust is only 1×10 -5 %, so it is considered to reduce the cost by electrodepositing silver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/46
CPCC25D3/46
Inventor 张明
Owner WUXI HUAYE IRON & STEEL
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