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Preparation method for silver and graphene composite coating of cyanide-free system

A graphene composite and system technology, applied in coatings, electrolytic coatings, etc., can solve the problems of environmental pollution by electroplating waste liquid, low hardness of pure silver coating, and highly toxic cyanide, and achieve good economic and social benefits. The effect of good abrasion resistance and low toxicity

Inactive Publication Date: 2016-08-03
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pure silver coating has disadvantages such as low hardness, high friction coefficient, poor high temperature resistance, and easy discoloration, which affect its application in aircraft instruments, electronic products, decorations, etc.
[0003] For a long time, the cyanide silver plating process has the advantages of good stability of the plating solution, high current efficiency, good dispersion ability, fine and bright crystallization of the obtained coating, etc., but the cyanide is highly toxic and will It is harmful to the human body, and its electroplating waste solution seriously pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Substrate treatment: Chemical degreasing uses EZ-111 chemical degreasing stock solution provided by Shenzhen Erzhen Company, the temperature is 60°C, and the time is 30 minutes. The composition of chemical polishing liquid is: nitric acid 200mL / L, sulfuric acid 200mL / L, phosphoric acid 200mL / L hydrochloric acid 10mL / L. Room temperature, time 20s. The composition of the silver immersion solution is: thiourea 160g / L, silver nitrate 20g / L, dilute nitric acid to adjust the pH value to 1. Room temperature, time 120s.

[0023] 2) Electroplating solution preparation: prepare 1L thiosulfate system graphene silver plating solution, its composition is as follows:

[0024] Sodium thiosulfate 225g / L

[0025] Potassium metabisulfite 45g / L

[0026] Silver nitrate 45g / L

[0027] Add 3g of graphene into 20mL of deionized water, mix with 30mL of sodium lauryl sulfate (10g / L) solution, stir and dissolve at room temperature, and finally add it into the silver plating solution, and...

Embodiment 2

[0030] 1) Substrate treatment: Chemical degreasing uses EZ-111 chemical degreasing stock solution provided by Shenzhen Erzhen Company, the temperature is 60°C, and the time is 30 minutes. The composition of chemical polishing liquid is: nitric acid 200mL / L, sulfuric acid 200mL / L, phosphoric acid 200mL / L hydrochloric acid 10mL / L. Room temperature, time 20s. The composition of the silver immersion solution is: thiourea 160g / L, silver nitrate 20g / L, dilute nitric acid to adjust the pH value to 1. Room temperature, time 120s.

[0031] 2) Electroplating solution preparation: prepare 1L thiosulfate system graphene silver plating solution, its composition is as follows:

[0032] Sodium thiosulfate 225g / L

[0033] Potassium metabisulfite 45g / L

[0034] Silver nitrate 45g / L.

[0035] Add 3g of graphene to 18mL of deionized water, then mix with 12mL of sodium dodecylsulfonate (25g / L) solution, stir and dissolve at room temperature, and finally add it to the silver plating solution,...

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Abstract

The invention discloses a preparation method for a silver and graphene composite coating of a cyanide-free system. Due to the fact that common problems that cyanide silver plating pollution is serious, the human body will be harmed, and meanwhile a silver coating has some defects exist, the preparation method is characterized in that dispersed grapheme is added in the cyanide-free system, and composite plating is carried out on a copper substrate. The preparation method comprises the basic steps that (1) a substrate is subject to oil removing and polishing, and silver soaking treatment is carried out; (2) sodium thiosulfate, potassium metabisulfite and silver nitrate are prepared into silver plating liquid, graphene powder, a certain amount of deionized water and a certain number of dispersing agent are mixed to be added into the silver plating liquid, and ultrasonic dispersion is carried out; and (3) a silver plate serves as an anode, the substrate serves as a cathode, the silver plate and the substrate are placed into the silver plating liquid to be subject to electroplating, and the silver-graphene composite coating is obtained. Compared with the prior art, the method is simple in process, good in controllability and wide in application scope; and the prepared silver-graphene composite coating is good in resistance to high temperature oxidation, high in resistance to sulfur, high in mechanical property and high in resistance to corrosion.

Description

technical field [0001] The invention belongs to the field of cyanide-free composite electroplating, and relates to a cyanide-free electroplating solution for composite silver plating, in particular to a method for preparing a cyanide-free system silver and graphene composite coating. Background technique [0002] Metal silver has excellent physical and chemical properties, making silver one of the most widely used precious metals, and electroplating silver with its relatively low cost has become the main way to obtain the excellent properties of silver. However, the pure silver coating has disadvantages such as low hardness, high friction coefficient, poor high temperature resistance, and easy discoloration, which affects its application in aircraft instruments, electronic products, and decorations. [0003] For a long time, the cyanide silver plating process has the advantages of good stability of the plating solution, high current efficiency, good dispersion ability, fine ...

Claims

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Application Information

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IPC IPC(8): C25D15/00C25D3/46C25D5/34
CPCC25D15/00C25D3/46C25D5/34
Inventor 赵晴张弘弘杜楠周海飞罗浩宇
Owner NANCHANG HANGKONG UNIVERSITY
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