Environmental non-cyanide plating solution for silver-plating

A silver electroplating and environment-friendly technology, applied in the field of electrochemical silver plating, can solve the problems of low industrial practical value, increased electroplating cost, poor coating adhesion, etc., to meet the needs of electroplating industry, low raw material cost, and reduced production cost. Effect

Inactive Publication Date: 2010-03-10
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are roughly the following problems: (1) The silver-plated layer is easy to change color
(2) Poor adhesion of coating
(3) The stability of the plating solution is poor and the service life is sh...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to 0.15mol / L AgNO 3 , 0.6mol / L β-alanine, 0.1mol / L uracil and 0.002g / L polyethyleneimine. Dissolve each substance in deionized water to prepare an environmentally friendly silver plating solution to adjust the pH value of the silver plating solution is 13, and the temperature of the silver electroplating solution is 15°C. Immerse the copper or brass plated parts in the silver electroplating solution, adopt a one-step electroplating method, and use a current density of 0.2A / dm 2 Electroplating is carried out on the copper plated parts until the thickness of the silver layer is 3 μm. The obtained silver layer is bright and has good bonding force with the matrix.

Embodiment 2

[0022] According to 0.15mol / L AgNO 3 , 0.5mol / L cystine, 0.1mol / L isonicotinic acid, 0.05g / L polyethyleneimine and 0.05g / L benzotriazole. Dissolve each substance in deionized water and prepare an environmentally friendly silver For the electroplating solution, the pH of the silver plating solution is adjusted to be 10, and the temperature of the silver electroplating solution is 40°C. Immerse the copper or brass plated parts in the silver electroplating solution, adopt a one-step electroplating method, and use a current density of 0.2A / dm 2 Electroplating is carried out on the copper plated parts until the thickness of the silver layer is 3 μm. The obtained silver layer is bright and has good bonding force with the matrix.

Embodiment 3

[0024] According to 0.1mol / L AgSO 3 CH 3 , 0.5mol / L aminodiacetic acid, 0.1mol / L 5,5-dimethylhydantoin, 0.95g / L polyethyleneimine and 0.05g / L 10ppm Sb were dissolved in deionized water, The environment-friendly silver electroplating solution is prepared, the pH of the silver plating solution is adjusted to be 8, and the temperature of the silver electroplating solution is 40°C. Immerse the brass plated parts in the silver electroplating solution, adopt a one-step electroplating method, and use a current density of 0.2A / dm 2 Electroplating is carried out on the copper plated parts until the thickness of the silver layer is 3 μm. The obtained silver layer is bright and has good bonding force with the matrix.

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PUM

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Abstract

An environmental non-cyanide plating solution for silver-plating contains silver ion source, amino acid compound and derivative thereof used as complexant, auxiliary complexant and plating additive. The component ratio and the process condition are as follows: the contents of silver salt, amino acid compound and derivative thereof, auxiliary complexant and plating additive are separately 0.01-1mol/L, 0.01-10mol/L, 0.002-2mol/L and 0.001-2.0g/L, the pH value of silver-plating solution is 6-14 and the temperature of the silver-plating solution is 10-70 DEG C. Compared with the traditional cyanide-containing formulation for silver-plating, the environmental plating solution for silver-plating is characterized by clean plating; meanwhile the replacement rate between silver ions in the platingsolution and active metal such as copper, copper alloy and the like and alloy base is extremely slow, the one-step electroplating method is adopted for silver-plating, pre-plating and soaking processes of silver are not needed, and the coating is bright with good binding force.

Description

technical field [0001] The invention relates to the technical field of electrochemical silver plating, in particular to a formula for an environment-friendly cyanide-free silver plating solution used to replace highly toxic cyanide silver plating solution technical background [0002] Silver plating has been widely used in fields such as decorations, tableware and electronic products. So far, most of the electroplating silver processes at home and abroad still use the cyanide silver plating process to electroplate the silver layer. However, cyanide is highly toxic and extremely harmful to humans and the environment. With the strengthening of environmental protection awareness and the promulgation of relevant policies in various countries around the world, cyanide electroplating has become a process with restricted declarations and eliminated in principle. [0003] Compared with the cyanide silver plating process, the research on the cyanide-free silver plating process has ...

Claims

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Application Information

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IPC IPC(8): C25D3/46
Inventor 谢步高杜力夫
Owner FUJIAN NORMAL UNIV
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