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Cyanide-free silvering electroplating solution and electroplating method

A cyanide-free silver plating and electroplating solution technology, which is applied in the field of silver plating technology, can solve the problems of insufficient stability of the plating solution, poor discoloration resistance and weldability of the coating, and achieve strong discoloration resistance and weldability of the coating, good stability effect

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

In the RoHS Directive formulated by the European Union (Regarding the Prohibition of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment, the WEEE Directive (Waste Electrical and Electronic Equipment Directive), the use of cyanide has been clearly restricted.
[0004] The discoloration resistance and solderability of the coating of the existing cyanide-free silver electroplating solution are poor, and the stability of the plating solution is not low enough

Method used

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  • Cyanide-free silvering electroplating solution and electroplating method
  • Cyanide-free silvering electroplating solution and electroplating method
  • Cyanide-free silvering electroplating solution and electroplating method

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Effect test

Embodiment 1

[0035] The formula of cyanide-free silver-plating electroplating solution is as follows:

[0036]

[0037]

[0038] Plating process conditions: the period of the square wave pulse current is 1ms, the duty cycle is 15%, and the average current density is 0.3A / dm 2 ; The pH is 9, the temperature is 25°C, and the electroplating time is 240min.

Embodiment 2

[0040] The formula of cyanide-free silver-plating electroplating solution is as follows:

[0041]

[0042] Plating process conditions: the period of the square wave pulse current is 2ms, the duty cycle is 20%, and the average current density is 0.35A / dm 2 ; The pH is 9.5, the temperature is 30°C, and the electroplating time is 240min.

Embodiment 3

[0044] The formula of cyanide-free silver-plating electroplating solution is as follows:

[0045]

[0046]

[0047] Plating process conditions: the period of the square wave pulse current is 3ms, the duty cycle is 25%, and the average current density is 0.4A / dm 2 ; The pH is 10, the temperature is 35°C, and the electroplating time is 240min.

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Abstract

The invention discloses a cyanide-free silvering electroplating solution and an electroplating method. The cyanide-free silvering electroplating solution includes: 25-35g / L silver nitrate, 90-110g / L 2, 4-imidazolinedione or 2, 4-imidazolinedione with the heterocyclic ring substituted by any group, 60-90g / L carbonate, 30-40g / L pyrophosphate, 0.30-0.45g / L hydroxypropyl propargyl ether, 0.10-0.25g / L benzaldehyde-2-sodium sulphonate, and 0.15-0.30g / L N, N-bis(hydroxyethyl)ethylamine. According to the technical scheme, 2, 4-imidazolinedione or 2, 4-imidazolinedione with the heterocyclic ring substituted by any group is selected as the complexing agent of the electroplating solution, so that the electroplating solution has 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 cyanide-free silver plating electroplating solution and an electroplating method. Background technique [0002] As a relatively cheap precious metal, silver is widely used in printed circuit boards and electronic devices in the electronics industry because of its high electrical and thermal conductivity, good chemical stability, and excellent processing performance. Aircraft, optical instruments, high-frequency components and waveguides and other important parts of communication equipment and equipment need to use silver to ensure good electrical conductivity and brazing performance. In addition, silver has a beautiful silver-white luster, and silver is also used as a decorative layer in household utensils, tableware and various handicrafts. Despite this, the amount of storage of silver in the earth's crust is relatively small (the mass content of silver elem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/46C25D5/18
CPCC25D3/46C25D5/18
Inventor 张明
Owner WUXI HUAYE IRON & STEEL
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