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Cu-Zn-Sn ternary alloy cyanide-free imitation gold plating solution and use method thereof

A cu-zn-sn, ternary alloy technology, applied in the field of cyanide-free imitation gold electroplating, can solve the problems of unsatisfactory appearance and color of imitation gold plating, endanger the health of operators, narrow range of process parameters, etc., and achieve the improvement of appearance and color , wide range of process parameters, good appearance and color effect

Inactive Publication Date: 2012-07-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional imitation gold electroplating process is cyanide electroplating, which is highly toxic, difficult to treat waste water and liquid waste, serious environmental pollution, and will seriously endanger the health of operators, so its application is greatly restricted
The existing cyanide-free imitation gold electroplating mainly includes Cu-Zn binary imitation gold electroplating and Cu-Zn-Sn ternary imitation gold electroplating process, but the existing processes have narrow range of process parameters and unsatisfactory appearance and color of imitation gold plating , there are many pinholes on the surface, pitting and other shortcomings, and its process still needs to be further improved and optimized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: copper sulfate: 50g / L; zinc sulfate: 13g / L; stannous sulfate: 7g / L; sulfuric acid: 5ml / L; potassium pyrophosphate: 270g / L; ethylenediamine: 55ml / L; citric acid Potassium: 18g / L; Nitrilotriacetic acid: 25g / L; Potassium hydroxide: 15g / L;

[0023] The process conditions of ternary alloy cyanide-free imitation gold electroplating solution are: pH value: 8.0, temperature: room temperature, cathode current density: 2.0A / dm 2 , Plating time: 60s.

[0024] The appearance of the cyanide-free imitation gold coating that embodiment 1 obtains is golden yellow, without structural defect; Plating solution deep plating ability is 82%, and current efficiency is 83.5%, and electrical conductivity is 0.0462Ω / m; No discoloration after soaking in sweat for 3 hours; high surface smoothness and low porosity; the interface with the bright nickel layer is firmly bonded without peeling, peeling and peeling; high stability in batch production; it can be used as a realistic imitation ...

Embodiment 2

[0025] Example 2: copper sulfate: 30g / L; zinc sulfate: 15g / L; stannous sulfate: 6g / L; sulfuric acid: 4ml / L; potassium pyrophosphate: 250g / L; ethylenediamine: 50ml / L; citric acid Potassium: 18g / L; Nitrilotriacetic acid: 20g / L; Potassium hydroxide: 15g / L

[0026] The process conditions of ternary alloy cyanide-free imitation gold electroplating solution are: pH value: 9.0, temperature: room temperature, cathode current density: 2.0A / dm 2 , Plating time: 60s.

[0027] The appearance of the cyanide-free imitation gold coating that embodiment 2 obtains is light yellow, without structural defect; Plating solution deep plating ability is 81%, and current efficiency is 82.8%, and electrical conductivity is 0.0464Ω / m; No discoloration after soaking in sweat for 3 hours; high surface smoothness and low porosity; the interface with the bright nickel layer is firmly bonded, no peeling, peeling and peeling; high batch production stability; can be used as a realistic imitation 9K gold deco...

Embodiment 3

[0028] Example 3: copper sulfate: 35g / L; zinc sulfate: 12g / L; stannous sulfate: 5g / L; sulfuric acid: 3ml / L; potassium pyrophosphate: 260g / L; ethylenediamine: 60ml / L; citric acid Potassium: 18g / L; nitrilotriacetic acid: 22g / L; potassium hydroxide: 20g / L.

[0029] The process conditions of ternary alloy cyanide-free imitation gold electroplating solution are: pH value: 10, temperature: room temperature, cathode current density: 2.5A / dm 2 , Plating time: 90s.

[0030] The appearance of the cyanide-free imitation gold coating obtained in Example 3 is golden red, without structural defects; the deep plating ability of the plating solution is 83.5%, the current efficiency is 83.2%, and the electrical conductivity is 0.0459Ω / m; No discoloration after soaking in sweat for 3 hours; high surface smoothness and low porosity; the interface with the bright nickel layer is firmly bonded, no peeling, peeling and peeling; high stability in batch production; can be used as a realistic imitati...

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Abstract

The invention discloses a Cu-Zn-Sn ternary alloy cyanide-free imitation gold plating solution and a use method thereof. In the plating solution, copper sulfate, zinc sulfate and stannous sulfate are used as main salts, potassium pyrophosphate is used as a main complexing agent, ethylene diamine, potassium citrate and nitrilotriacetic acid are used as auxiliary complexing agents, sulfuric acid is used as an antioxidant and an anti-hydrolysis agent for stannous ions, and potassium hydroxide is used as a regulator for regulating the pH value of the plating solution. The operating conditions are as follows: the cathode current density is 1.0-3.0A / dm2, the pH value is 8.0-10.0, the temperature of the plating solution is room temperature, the plating time is 60-90s, the mechanical stirring or cathode movement is adopted, the anode material is 316L stainless steel, and the plating process is carried out on the substrate of a plating bright nickel layer. The invention has simple formula of the plating solution, easy control, wide process parameter range, fine crystal, good appearance color, stable plating solution, long service life, strong uniformly plating capacity and covering capacity, and high stability in batch production. The technology can replace the cyanide imitation gold plating process to be used as the plating process for imitating 9K, 18K or 24K gold on surfaces of decorative articles such as jewelry, clocks, handicraft articles and the like.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to the cyanide-free imitation gold electroplating technology. Background technique [0002] Imitation gold electroplating is a decorative alloy electroplating technology. Jewelry, handicrafts, household appliances, lamps and clocks and other accessories are coated with a decorative imitation gold coating to become dazzling, which can achieve the same appearance as pure gold and its coating. The effect of the same color and luster, so the imitation gold plating is very popular. There are two types of imitation gold plating: cyanide plating and cyanide-free plating. The traditional imitation gold electroplating process is cyanide electroplating, which is highly toxic, difficult to treat waste water and liquid waste, serious environmental pollution, and will seriously endanger the health of operators, so its application is greatly restricted. The existing cyanide-free imitatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/56
Inventor 徐瑞东王军丽
Owner KUNMING UNIV OF SCI & TECH
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