Anti-tarnishing agent for cyanide-free silver plating and application thereof

A technology of cyanide-free silver plating and anti-discoloration agent, which is applied in the field of electroplating, can solve the problems of poor anti-discoloration performance of the coating, huge environmental damage, and safety hazards, and achieve the effects of improving anti-discoloration performance, solving easy discoloration, and avoiding discoloration

Pending Publication Date: 2021-12-07
CHONGQING LIDAO SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional silver plating adopts a system containing highly toxic cyanide. The total content of cyanide in the plating solution of this system reaches 100-200 g / L, and the content of cyanide in the cleaning water after plating is also extremely high. 0.05 g of cyanide can cause death. Wounds are immediately poisoned when exposed to cyanide. There are huge safety hazards in the use and transportation of cyanide. In history, cyanide has caused great harm to humans and the environment. The research on cyanide-free silver plating technology originated in the 1950s. It has been widely used in production. The stability, dispersion ability and deep plating ability of the plating solution have fully reached the level of the cyanide process. Under the atmospheric environment, the cyanide silver plating layer does not change color for about 200 days, while the cyanide-free silver plating layer can only reach about 60 days. The silver layer does not change color for about 200 days in the atmospheric environment. The success of this research will greatly promote the popularization and application of cyanide-free silver plating process

Method used

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  • Anti-tarnishing agent for cyanide-free silver plating and application thereof
  • Anti-tarnishing agent for cyanide-free silver plating and application thereof
  • Anti-tarnishing agent for cyanide-free silver plating and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The mass concentration ratio of each component of the cyanide-free silver plating anti-tarnish agent described in the present embodiment is as follows:

[0031] Sodium lauryl sulfate 0.5g / L

[0032] 2-p-aminobenzenesulfonamido-5-methoxypyrimidine 15g / L

[0033] The solvent is deionized water.

[0034] The preparation method of anti-tarnish agent for cyanide-free silver plating described in the present embodiment is as follows:

[0035] 1) Preparation of sodium lauryl sulfate solution: Dissolve 0.5 g of sodium lauryl sulfate in 200 ml of warm deionized water at about 50°C, stir to dissolve completely until clear, and set aside;

[0036] 2) Preparation of 2-p-aminobenzenesulfonyl-5-methoxypyrimidine solution: Dissolve 15 g of 2-p-aminobenzenesulfonyl-5-methoxypyrimidine in 500 ml of deionized water, slowly add 50% analytically pure hydrogen Potassium oxide solution, until the pH value is 10-13, to promote dissolution, stir to dissolve completely until clear, set aside....

Embodiment 2

[0047] The concentration ratio of each component of the silver-plated anti-tarnish agent described in the present embodiment is as follows:

[0048] Sodium Lauryl Sulfate 1g / L

[0049] 2-p-aminobenzenesulfonamido-5-methoxypyrimidine 20g / L

[0050] The solvent is deionized water.

[0051] The preparation method of the anti-tarnish agent for cyanide-free silver plating described in this embodiment is the same as that in Embodiment 1, except that the amounts of the components are calculated according to the above-mentioned proportions.

[0052] performance testing

[0053] Get 30ml of the anti-tarnish agent for cyanide-free silver plating prepared in Example 2 and add in 1L cyanide-free silver-plating solution, and the workpiece is heated at 0.5A / dm 2 , After electroplating at 40°C for 2 hours, take out the plated workpiece, treat it with a protective agent and dry it, measure the thickness of the silver-plated layer with an X-ray fluorescence meter, and place it in an atmospher...

Embodiment 3

[0059] The concentration ratio of each component of the silver-plated anti-tarnish agent described in the present embodiment is as follows:

[0060] Sodium castor oil sulfate 0.5g / L

[0061] Sodium sulfacetamide 5g / L

[0062] Sulfabenzopyrazole 5g / L

[0063] The solvent is deionized water.

[0064] The preparation method of the anti-tarnish agent for cyanide-free silver plating described in this embodiment is the same as that in Embodiment 1, except that the amounts of the components are calculated according to the above-mentioned proportions.

[0065] performance testing

[0066] Get 30ml of the anti-tarnish agent for cyanide-free silver plating prepared in Example 3 and add it to 1L of cyanide-free silver plating solution, and place the workpiece therein at 0.5A / dm 2 , After electroplating at 40°C for 2 hours, take out the plated workpiece, treat it with a protective agent and dry it, measure the thickness of the silver-plated layer with an X-ray fluorescence meter, and ...

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Abstract

The invention relates to an anti-tarnishing agent for cyanide-free silver plating, which comprises the following components by mass concentration: 0.1-2g / L of a sulfuric acid compound, 10-25g / L of a sulfanilamide compound and water as a solvent. The sulfuric acid compound is one or more of castor oil sodium sulfate, lauryl sodium sulfate or ammonium thiosulfate. The sulfanilamide compound is one or more of 2-p-aminobenzene sulfonamide-5-methoxypyrimidine, sulfametoxypyrimidine, sulfaacetic acid sodium or sulfadiazol. According to the anti-tarnishing agent for the silver plating provided by the invention, the anti-tarnishing performance of silver plating parts is improved, the anti-corrosion performance of the silver plating parts is particularly improved remarkably, the storage cost of the silver plating parts is reduced, and the anti-tarnishing agent for the silver plating can be widely applied to the technical field of silver plating.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and relates to an anti-tarnish agent for cyanide-free silver plating and an application thereof. Background technique [0002] Electroplating is the process of plating a thin layer of other metals or alloys on the surface of certain metals using the principle of electrolysis. It is a process of using electrolysis to attach a layer of metal film to the surface of metal or other material parts to prevent metal oxidation. role, and can also play a role in improving wear resistance, electrical conductivity, light reflection, corrosion resistance, etc. Silver is a silvery-white, malleable, malleable and reflective precious metal. With its excellent performance and relatively low cost, it has become one of the most widely used precious metals. Among all metals, silver has the best conductivity, and has good thermal conductivity, ductility, light reflection, corrosion resistance and welding perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/46
CPCC25D3/46
Inventor 胡国辉师玉英刘军肖春艳韩力王辉李谢武汪青
Owner CHONGQING LIDAO SURFACE TECH
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