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A kind of cyanide-free electroplating nano-gold electrolytic solution and its preparation method and the method of using it to prepare nano-gold coating

An electrolyte preparation and nano-gold technology, applied in electrodes and other directions, can solve the problems of coarse gold grains and poor stability, and achieve the effect of bright coating and golden color of coating.

Active Publication Date: 2021-07-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of the poor stability of the existing cyanide-free electroplating process and the coarse gold crystal grains deposited by using hydantoin and its derivatives as complexing agents, and to provide a nano-gold electrolytic process for cyanide-free electroplating. Solution, preparation method and method for preparing nano-gold coating using it

Method used

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  • A kind of cyanide-free electroplating nano-gold electrolytic solution and its preparation method and the method of using it to prepare nano-gold coating
  • A kind of cyanide-free electroplating nano-gold electrolytic solution and its preparation method and the method of using it to prepare nano-gold coating
  • A kind of cyanide-free electroplating nano-gold electrolytic solution and its preparation method and the method of using it to prepare nano-gold coating

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specific Embodiment approach 1

[0022] Specific embodiment one: This embodiment is a kind of cyanide-free electroplating nano-gold electrolyte prepared from main salt, complexing agent, conductive salt, additive and distilled water; described main salt is chloroauric acid; described complexing Hydantoin, 5,5-dimethylhydantoin, 5,5-diphenylhydantoin, 1,3-dibromo-5,5-dimethylhydantoin and one or more of 1,3-dichloro-5,5-dimethylhydantoin; the conductive salt is potassium carbonate; the additive is 5-aminoquinoline, 5-fluoro Cytosine, o-phenanthroline, 1-acetylpiperidine, N-acetyl-L-glutamine, polydiallyldimethylammonium chloride, 5-bromoindole, polyacrylamide, polycarboxylate One or a combination of non-, N-isopropylpiperazine, sodium polyanethol sulfonate and 2,2-bipyridine.

[0023] Principles and advantages of this embodiment:

[0024] 1. In this embodiment, organic hydantoin and its derivatives are used as electroplating gold complexing agents, and 5-aminoquinoline, 5-fluorocytosine, o-phenanthroline, 1-...

specific Embodiment approach 2

[0027] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the concentration of the main salt in the described cyanide-free electroplating nano-gold electrolyte is 0.01mol L -1 ~0.10mol·L -1 . Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the concentration of the complexing agent in the cyanide-free electroplating nano-gold electrolyte is 0.20mol L -1 ~0.40mol·L -1 . Other steps are the same as those in Embodiment 1 or 2.

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Abstract

A cyanide-free electroplating nano-gold electrolyte, a preparation method and a method for preparing a nano-gold coating by using the same, relate to an electrolyte, a preparation method and an application. The purpose of the present invention is to solve the problems of poor stability of the existing cyanide-free electroplating process and coarse gold grains deposited by using hydantoin and its derivatives as complexing agents. A cyanide-free electroplating nano-gold electrolyte is prepared from main salt, complexing agent, conductive salt, additives and distilled water; method: 1, dissolving complexing agent and conductive salt into distilled water; 2, dissolving main salt into Distilled water; 3. Mixing, adding additives, and constant volume. The method of preparing nano-gold coating by using a cyanide-free electroplating nano-gold electrolyte is to use a pure gold sheet as an anode, and a copper foil coated with a bright nickel layer on the surface as a cathode, and immerse the anode and the cathode in the nano-gold used for the preparation of cyanide-free electroplating. In the electrolytic solution of the plating layer, the temperature, stirring speed and current density are controlled for electroplating. The invention is suitable for preparing nano-gold coating.

Description

technical field [0001] The invention relates to an electrolyte, a preparation method and application. Background technique [0002] Nanoscale gold has special physical and chemical properties such as good electrical conductivity, biocompatibility, small size effect, quantum tunneling effect and high surface chemical activity, so it is widely used in electroplating, industrial catalysis, biomedicine, food safety rapid detection, etc. The field has wide application. When used as a decorative and protective coating, the nano-scale grains will make the coating more dense, firmly bonded to the substrate, and less likely to produce pores, so the required thickness of the gold coating is reduced, thereby reducing costs and improving the substrate. protective effect. At the same time, the main uses of gold nanoparticles in industrial catalysis are as follows: oxidation of CO, reduction of NOx, hydrochlorination of acetylene, selective oxidation of alcohols, photocatalytic decompos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/48C25D17/10
CPCC25D3/48C25D17/10
Inventor 安茂忠屠晓强杨培霞张锦秋
Owner HARBIN INST OF TECH