Chemical-physical combined method of deplating copper and copper-zinc alloy-based silver coating

A silver coating, alloy-based technology, applied in chemical instruments and methods, cleaning methods using liquids, cleaning methods and utensils, etc., can solve the problem of inability to achieve separation and recovery of substrates and coatings, high equipment and control requirements, and waste liquid treatment costs. High cost and other problems, to achieve the effect of improving the working conditions of workers, less substrate corrosion, and low processing costs

Active Publication Date: 2019-03-15
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common deplating technologies for silver coatings are mainly mixed acid system, aqua regia system, highly toxic cyanide system and electrolytic deplating; mixed acid system and aqua regia system are strongly acidic and even oxidizing, making the deplating process difficult control, it is easy to cause severe corrosion and dissolution of the substrate, and the effective separation and recovery of the substrate and the coating cannot be realized. At the same time, the cost of waste liquid treatment is high; the cyanide system is highly toxic and extremely dangerous to operate, which will pose a serious threat to workers and the environment. ;Electrolytic deplating technology has higher requirements on equipment and control, and the operating cost increases, which reduces the economic profit of the enterprise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of method of chemistry-physics combined deplating copper and copper-zinc alloy base silver coating, comprises the following steps:

[0020] Step 1, preparation stripping solution;

[0021] The composition of the stripping solution, in terms of molar concentration: sodium thiosulfate 0.2mol / L, anhydrous copper sulfate 0.05mol / L, ammonia water 0.6mol / L, ammonium sulfate 0.2mol / L, and the rest is deionized water;

[0022] Step 2,

[0023] The plated parts are cleaned in ethanol before stripping to remove surface oil, and then cleaned with deionized water;

[0024] The deplating solution is placed in the reactor, and the plated parts are immersed in the deplating solution, and the mass ratio of the plated parts to the volume of the deplating solution is 80g / L;

[0025] A cover plate is installed on the top of the reactor to reduce the volatilization of ammonia during the stripping process;

[0026] Carry out magnetic stirring, place the plated piece in a hanging b...

Embodiment 2

[0031] A kind of method of chemistry-physics combined deplating copper and copper-zinc alloy base silver coating, comprises the following steps:

[0032] Step 1, preparation stripping solution;

[0033] The composition of the stripping solution, in terms of molar concentration: sodium thiosulfate 0.1mol / L, anhydrous copper sulfate 0.04mol / L, ammonia water 0.5mol / L, ammonium sulfate 0.1mol / L, and the rest is deionized water;

[0034] Step 2,

[0035] The plated parts are cleaned in ethanol before stripping to remove surface oil, and then cleaned with deionized water;

[0036] Place the deplating solution in the reactor, immerse the plated parts in the deplating solution, and the mass ratio of the plated parts to the volume of the deplating solution is 60g / L;

[0037] A cover plate is installed on the top of the reactor to reduce the volatilization of ammonia during the stripping process;

[0038] Carry out magnetic stirring, and the plated parts are immersed in the deplating...

Embodiment 3

[0043] A kind of method of chemistry-physics combined deplating copper and copper-zinc alloy base silver coating, comprises the following steps:

[0044] Step 1, preparation stripping solution;

[0045] The composition of the stripping solution, in terms of molar concentration: sodium thiosulfate 0.05mol / L, anhydrous copper sulfate 0.02mol / L, ammonia water 0.5mol / L, ammonium sulfate 0.05mol / L, and the rest is deionized water;

[0046] Step 2,

[0047] The plated parts are cleaned in ethanol before stripping to remove surface oil, and then cleaned with deionized water;

[0048] The deplating solution is placed in the reactor, the plated parts are immersed in the deplating solution, and the mass ratio of the plated parts to the volume of the deplating solution is 50g / L;

[0049] A cover plate is installed on the top of the reactor to reduce the volatilization of ammonia during the stripping process;

[0050] Carry out mechanical stirring, and the plated parts are immersed in ...

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PUM

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Abstract

The invention belongs to the technical field of deplating and discloses a chemical-physical combined method of deplating a copper and copper-zinc alloy-based silver coating. The method comprises the following steps: S1, preparing a deplating solution; S2, putting the deplating solution in a reactor, immersing a plated part in the deplating solution, and stirring and deplating the plated part to obtain a silver-containing solution and the deplated plated part; S3, recovering silver in the silver-containing solution according to a conventional method; and S4, putting the deplated plated part indeionized water and carrying out ultrasonic action till residual coating is deplated to obtain solid high purity metal silver. The method is simple to operate, can be used for deplating silver coatings of copper and a copper-zinc alloy quickly and is small in matrix corrosion. The reaction process is easy to control, the treatment cost is low, the alkaline environment is safe, ammonia volatilization is very small, the environmental pollution is reduced, and the working conditions of workers are improved. In the deplating process, the liquid silver-containing solution and the high purity silverproduct in a solid form can be obtained at the same time, and the follow-up silver recovery treatment cost is lowered effectively.

Description

technical field [0001] The invention belongs to the technical field of deplating, and in particular relates to a chemical-physical combined method for deplating copper and copper-zinc alloy-based silver plating. Background technique [0002] In order to make the device achieve certain technical parameters and performance, silver plating is often performed on the surface. As an effective surface treatment technology, silver plating is widely used in the manufacturing process of electrical components, electronic equipment, communication equipment and instruments. When the plated parts are old or damaged after long-term use and replaced, it is necessary to separate and recycle the coating on the surface of the device and the internal matrix to achieve a certain degree of economy and sustainable resource utilization. Common deplating technologies for silver coatings are mainly mixed acid system, aqua regia system, highly toxic cyanide system and electrolytic deplating; mixed ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/40B08B3/12C22B7/00C22B11/00
CPCB08B3/12C22B7/00C22B11/00C23F1/40Y02P10/20
Inventor 杨洪英赵鹤飞金哲男佟琳琳
Owner NORTHEASTERN UNIV
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