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Cyanide-free silver-graphene composite coating and preparation method

A composite coating, silver-graphite technology, applied in the functional design and preparation of the coating, in the field of functional coating, can solve the problems of affecting the conductivity of the composite coating, environmental friendly phase violation, cyanide is highly toxic, etc., to achieve the production process. High efficiency, excellent comprehensive performance, convenient recycling and reprocessing effect

Inactive Publication Date: 2017-02-01
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cyanide used is highly toxic, which is contrary to environmental friendliness, and the poor electrical and thermal conductivity of graphite will inevitably affect the electrical and thermal conductivity of the composite coating. There is an urgent need for a material with excellent electrical conductivity, thermal conductivity and self-lubrication to replace graphite.

Method used

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  • Cyanide-free silver-graphene composite coating and preparation method
  • Cyanide-free silver-graphene composite coating and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Solution configuration

[0027] ①The main components of the pre-silvering solution are: AgNO 3 10 g / L, KI 200 g / L, Na 2 S 2 o 3 80 g / L, HNO 3 5 g / L, temperature 25 ℃, time 30 s, pH value 4.

[0028] ②The main components of the composite plating solution are: AgNO 3 20 g / L, KI 260 g / L, Na 2 S 2 o 3 80 g / L, HNO 3 5 g / L, 5 g / L dispersant, 20 g / L nanographene sheet, stirring speed 700 r / min, stirring time 40 min, pH value 4.

[0029] The components of the dispersant are: sodium polyacrylate 2 wt%, sodium carboxymethyl cellulose 1 wt%, alkylphenol polyoxyethylene ether 3 wt%;

[0030] (2) Coating preparation

[0031] Grinding: Use 400# water sandpaper to evenly polish the substrate.

[0032] Strong alkali degreasing: put the test piece in the degreasing solution, soak for 5 minutes to carry out strong alkali degreasing.

[0033] ③Clean the degreased test piece with deionized water.

[0034] ④ Pickling: Soak the cleaned test piece in the pickling s...

Embodiment 2

[0040] (1) Solution configuration

[0041] ①The main components of the pre-silvering solution are: AgNO3 10 g / L, KI 200 g / L, Na 2 S 2 o 3 80 g / L, HNO 3 5 g / L, temperature 25 ℃, time 30 s, pH value 4.

[0042] ②The main components of the composite plating solution are: AgNO 3 20 g / L, KI 260 g / L, Na 2 S 2 o 3 80 g / L, HNO 3 5 g / L, 5 g / L dispersant, 30 g / L nanographene sheet, stirring speed 700 r / min, stirring time 40 min, pH value 4.

[0043] The components of the dispersant are: sodium polyacrylate 1 wt%, sodium carboxymethyl cellulose 2 wt%, alkylphenol polyoxyethylene ether 3 wt%;

[0044] (2) Coating preparation

[0045] Grinding: Use 800# water sandpaper to evenly polish the substrate.

[0046] Strong alkali degreasing: put the test piece in the degreasing solution, soak for 5 minutes to carry out strong alkali degreasing.

[0047] ③Clean the degreased test piece with deionized water.

[0048] ④ Pickling: Soak the cleaned test piece in the pickling sol...

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Abstract

The invention discloses a cyanide-free silver-graphene composite coating and a preparation method. The surface of a copper base material is electroplated with a silver coating and a silver-graphene coating. The preparation method of the cyanide-free silver-graphene composite coating comprises the steps of base body treatment, silver-graphene composite plating solution preparing, silver preplating and silver-graphene composite coating preparing. The cyanide-free silver-graphene composite coating has good electrical conductivity, good thermal conductivity, good abrasion resistance, a long service life, good corrosion resistance and good anti-sulfuration capacity, wherein the contact resistance is 15-30 [mu]omega (the external torque is 5-20 N.m); the heat conductivity rate is 350-500 W.m<1>.K<1>; the friction coefficient is 0.06-0.22 when the load at the normal temperature and pressure is 280 g; and the service life meet the standard between the M1 level and the M2 level of disconnector mechanical life levels in a mechanical life experiment (the clamping force is 400-600 N). The cyanide-free silver-graphene composite coating has good comprehensive performance, can meet outdoor working conditions of high-voltage disconnectors and has large application value.

Description

technical field [0001] The invention relates to a functional coating of cyanide-free silver graphene, in particular to a functional design of the coating and a preparation method thereof, belonging to the technical field of electric contact protection materials. Background technique [0002] At present, the protection parts of the dynamic and static contacts of outdoor high-voltage disconnectors are mostly designed with cyanide-plated pure silver. This kind of electrical contact material can provide good electrical conductivity, thermal conductivity and low and stable contact resistance. However, the traditional cyanide silver plating system pollutes the environment greatly, and the coating has disadvantages such as large amount of wear and poor welding resistance, which eventually leads to heating failure of the disconnector. Due to the self-lubricating properties, oxidation resistance, good stability of flake graphite, and its large specific surface area and surface energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/46C25D15/00C25D5/10C25D5/34
CPCC25D3/46C25D5/10C25D5/34C25D15/00
Inventor 叶志国何庆庆涂景罗刘书潭薛金涛罗辞辞王超陈川马光
Owner NANCHANG HANGKONG UNIVERSITY
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