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Protective agent applied to cyanide-free silver coating and preparation method thereof

A cyanide-free silver plating and protective agent technology, applied in coatings, metal material coating processes, anti-corrosion coatings, etc., can solve the problems of poor anti-tarnish performance, limited application, low electrical conductivity, etc., and achieve good corrosion resistance and Conductive properties, good gloss and corrosion resistance, effects of preventing discoloration due to chemical reactions

Active Publication Date: 2020-12-29
GUANGZHOU SANFU NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For now, the research and development of the cyanide-free electroplating process has always lagged behind the market demand of the electroplating industry. across
[0004] At present, the main problems in the cyanide-free silver plating process are: the integrity index of the silver plating layer cannot meet the requirements, especially in the aspect of engineering application silver plating. higher requirements
Although the protection methods of the above two cyanide-free silver plating layers can make the silver layer more stable and improve the anti-tarnish ability, this protective layer will reduce the conductivity of the silver plating layer, reduce the brightness of the silver plating layer, and limit its use in the electronics industry. Applications
[0006] In summary, there are generally technical problems in the prior art such as insufficient brightness and easy discoloration of the coating, low electrical conductivity, and poor anti-discoloration performance.

Method used

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  • Protective agent applied to cyanide-free silver coating and preparation method thereof
  • Protective agent applied to cyanide-free silver coating and preparation method thereof
  • Protective agent applied to cyanide-free silver coating and preparation method thereof

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preparation example Construction

[0026] The preparation method of the protective agent applied to the cyanide-free silver plating layer described in this embodiment comprises the following steps: film forming agent, cosolvent, poly(3,4-ethylenedioxythiophene)-poly(styrene Sulfonic acid), ammonium carbamate and 1-phenyl-5-mercaptotetrazolium are mixed evenly, and propanol solution is added and stirred evenly to obtain.

[0027] The method of using the protective agent applied to the cyanide-free silver plating layer prepared in this embodiment is as follows: immerse the silver-plated workpiece in the protective agent, keep the temperature at 35-40°C, and take it out after immersion for 1-3 minutes , Dry at 50-55°C for 5 minutes.

Embodiment 1

[0028] Embodiment 1, a kind of protective agent applied to cyanide-free silver plating layer

[0029] The protective agent applied to the cyanide-free silver plating layer comprises the following components and parts by weight thereof:

[0030] 30 parts of film-forming agent, 15 parts of co-solvent, 7 parts of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid), 15 parts of ammonium carbamate, 1-phenyl-5-mercapto tetra 10 parts of azoles, 50 parts of propanol.

[0031] The film-forming agent used in the protective agent for the cyanide-free silver plating layer is composed of dodecyl mercaptan, linoleic acid and polyphenol glycidyl ether epoxy resin in a mass ratio of 21:13:3.

[0032] The co-solvent used in the protective agent for the cyanide-free silver plating layer is composed of benzyl alcohol, propylene glycol phenyl ether and ethylene glycol butyl ether in a mass ratio of 15:7:12.

[0033] The particle size of poly(3,4-ethylenedioxythiophene)-poly(styrenesulf...

Embodiment 2

[0034] Embodiment 2, a kind of protective agent applied to cyanide-free silver plating layer

[0035] The protective agent applied to the cyanide-free silver plating layer comprises the following components and parts by weight thereof:

[0036] 37 parts of film-forming agent, 18 parts of co-solvent, 9 parts of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid), 18 parts of ammonium carbamate, 1-phenyl-5-mercapto tetra 13 parts of azoles, 46 parts of propanol.

[0037] The film-forming agent used in the protective agent for the cyanide-free silver plating layer is composed of dodecyl mercaptan, linoleic acid and polyphenol glycidyl ether epoxy resin in a mass ratio of 23:14:5.

[0038] The co-solvent used in the protective agent for the cyanide-free silver plating layer is composed of benzyl alcohol, propylene glycol phenyl ether and propylene glycol butyl ether in a mass ratio of 17:8:11.

[0039] The particle diameter of poly(3,4-ethylenedioxythiophene)-poly(styren...

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Abstract

The invention belongs to the technical field of electro-chemical silver plating, and particularly relates to a protective agent applied to a cyanide-free silver coating and a preparation method thereof. The protective agent applied to a cyanide-free silver coating is prepared from a film-forming agent, a co-solvent, poly(3,4-ethylenedioxy thiophene)-poly(styrene sulfonic acid), ammonium carbamate,1-phenyl-5-mercaptotetrazole and propyl alcohol. The protective agent can form a nano scale protective layer on the surface of a silver coating, does not influence the brightness of the silver coating, has good corrosion resistance and conductivity, and can effectively prevent the silver coating from chemical reaction discoloration after contacting halogen and sulfur substances. Besides, the protective agent is simple and convenient in preparation process, free of harmful gas in the production process, environmentally friendly, simple in formula components and easy to realize industrial production.

Description

technical field [0001] The invention belongs to the technical field of electrochemical silver plating, and in particular relates to a protective agent applied to a cyanide-free silver plating layer and a preparation method thereof. Background technique [0002] Silver plating is widely used in the power electronics industry and the aerospace industry because of its excellent conductivity and weldability. It is also widely used as a decorative coating in tableware, jewelry and other crafts and artworks. In 1840, Britain applied for the patent of cyanide silver plating for the first time, creating a new era of electroplating industry. However, the main component of silver cyanide plating solution is potassium silver cyanide. Potassium cyanide is highly toxic, seriously pollutes the environment, and endangers the health of producers. Moreover, the cost of waste liquid treatment is relatively high, so cyanide silver plating is gradually being replaced by cyanide-free replaced b...

Claims

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Application Information

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IPC IPC(8): C09D163/10C09D165/00C09D125/18C09D7/63C09D7/20C09D5/08C09D5/24C25D5/48C25D3/46C23C22/02
CPCC08L2201/04C08L2205/03C09D5/08C09D5/24C09D163/10C23C22/02C25D3/46C25D5/48C09D7/20C09D7/63C08L65/00C08L25/18C08K5/175C08K5/378
Inventor 田志斌詹益腾许荣国
Owner GUANGZHOU SANFU NEW MATERIALS TECH
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