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A kind of blackening treatment agent for silver-plated parts and silver-plating chemical blackening treatment method

A treatment method and technology of blackening agent, applied in the direction of metal material coating process, etc., can solve the problems of long blackening time, no beneficial function, and high blackening temperature, and achieve stable chemical properties, improved appearance and performance, and improved surface uniform effect

Active Publication Date: 2019-07-26
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polysulfides can provide sulfur, the substance itself does not have other beneficial functions
In addition, this method has problems such as high blackening temperature and long blackening time.

Method used

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  • A kind of blackening treatment agent for silver-plated parts and silver-plating chemical blackening treatment method
  • A kind of blackening treatment agent for silver-plated parts and silver-plating chemical blackening treatment method
  • A kind of blackening treatment agent for silver-plated parts and silver-plating chemical blackening treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The main blackening agent is linear dodecyl mercapto (HS-(CH 2 ) 11 -CH 3 ), the content is 0.6molL -1 . The auxiliary blackening agent is p-methylthiophenol (also known as 4-methylthiophenol or 4-mercaptotoluene), the content is 0.02molL -1 . Surfactant is OP emulsifier content is respectively 0.1g / L. The solvent is 95% ethanol and 5% water. The blackening time is 15 minutes, and the temperature of the blackening solution is 40°C. The samples were aged for 24 hours after blackening.

Embodiment 2

[0027] The main blackening agent is linear tetradecyl mercaptool (HS-(CH 2 ) 13 -CH 3 ), the content is 0.8molL -1 . The auxiliary blackening agent is 4-mercaptobenzoic acid, the content is 0.05molL -1 . Surfactant is Triton 0.01g / L and OP emulsifier 0.1g / L. The solvent is 98% ethanol and 2% water. The blackening time is 20 minutes, and the temperature of the blackening solution is 50°C. The samples were aged for 48 hours after blackening.

Embodiment 3

[0029] The main blackening agent is straight-chain hexadecyl mercaptool (HS-(CH 2 ) 15 -CH 3 ), the content is 0.5molL -1 . The auxiliary blackening agent is 4-mercaptoaniline, the content is 0.08molL -1 . Surfactant is 0.1g / L OP emulsifier and 0.1g / L alkylphenol polyoxyethylene ether. The solvent is 98% ethanol and 2% water. The blackening time is 10 minutes, and the temperature of the blackening solution is 35°C. The samples were aged for 24 hours after blackening.

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PUM

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Abstract

The invention provides a silver-plated part blackening treatment agent and a silver-plated chemical blackening treatment method. The chemical blackening treatment method can be used for rapidly treating a lot of fine plated parts, such as silver-plated buttons and accessories, which are not suitable for being subjected to electrochemical blackening; the appearance and performance of a treated silver-plated layer are remarkably improved and a blackened layer is firm and stable and has a good bonding force with a substrate; the silver-plated layer is not faded after being subjected to mechanicalactions including wiping and the like; the plated part have stable chemical properties and the anti-corrosion performance is greatly enhanced; the surface of the treated plated part is uniform, has ablack color and is flat and bright. The chemical blackening treatment method has the advantages that the accessories are beautiful and the like.

Description

technical field [0001] The invention relates to the technical field of electroplating and surface engineering, in particular to a blackening treatment agent for silver-plated parts and a chemical blackening treatment method for silver-plating. Background technique [0002] The silver plating process is widely used. It is not only used for decorative plating, but also widely used in manufacturing industries such as electrical, instrumentation and lighting. Compared with other common metals, such as copper, tin, zinc and nickel, silver has a higher electrode potential, so it is more stable. But silver plating is prone to discoloration, for example, even trace amounts of sulfur compounds in the air can discolor silver. Therefore, in order to improve the anti-tarnish performance of the coating, post-plating treatment is usually required. [0003] There are many reasons for the discoloration of the silver coating, mainly in the natural environment or industrial environment, ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/48C25D3/46C23C22/02C23C22/68
CPCC23C22/02C23C22/68C25D3/46C25D5/48
Inventor 赵健伟孙志赵博儒
Owner JIAXING UNIV
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