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Graphene oxide/cobalt-based composite plating as well as preparation method and application thereof

A composite coating, graphene technology, applied in the direction of coating, electrolytic coating, etc., to reduce friction coefficient and wear rate, good economy, simple and easy preparation method

Inactive Publication Date: 2019-01-01
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few related patents and papers about cobalt-based composite coatings at home and abroad, especially the integrated graphite oxide / cobalt-based composite coatings for anti-wear, anti-friction and corrosion resistance.

Method used

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  • Graphene oxide/cobalt-based composite plating as well as preparation method and application thereof
  • Graphene oxide/cobalt-based composite plating as well as preparation method and application thereof
  • Graphene oxide/cobalt-based composite plating as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Configure the composite electroplating solution: dissolve cobalt sulfate, nickel sulfate, sodium hypophosphite, boric acid, sodium gluconate, and graphene oxide into deionized water to make a composite electroplating solution; the concentration of cobalt sulfate is 20g / L, The concentration of nickel sulfate is 20g / L, the concentration of sodium hypophosphite is 16g / L, the concentration of boric acid is 16g / L, the concentration of sodium gluconate is 16g / L, and the concentration of graphene oxide is 0.1g / L. Sodium oxide and dilute sulfuric acid adjust the pH value of the plating solution to 3.

[0032] 2. Take the anode as a cobalt sheet, and the cathode as a brass substrate that has undergone degreasing-cleaning-acid activation. The distance between the two electrodes is 3cm. Immerse the above-mentioned anode and cathode in the electroplating solution obtained in step S1. After vibrating in the vibrator for 20 minutes, pulse current was used for electrodeposition, an...

Embodiment 2

[0034] 1. Configure composite electroplating solution: dissolve cobalt sulfate, nickel sulfate, sodium hypophosphite, boric acid, sodium citrate, and graphene oxide into deionized water to make composite electroplating solution; among them, the concentration of cobalt sulfate is 50g / L, The concentration of nickel sulfate is 50g / L, the concentration of sodium hypophosphite is 10g / L, the concentration of boric acid is 40g / L, the concentration of sodium citrate is 40g / L, and the concentration of graphene oxide is 0.2g / L. Sodium oxide and dilute sulfuric acid adjust the pH value of the plating solution to 3.

[0035] 2. The anode is a nickel sheet, and the cathode is a No. 45 steel substrate that has undergone degreasing-cleaning-acid activation. The distance between the two electrodes is 2cm. The above-mentioned anode and cathode are immersed in the electroplating solution obtained in step S1. After 30 minutes of ultrasonic vibration in the vibrator, pulse current was used for el...

Embodiment 3

[0038] 1. Configure composite electroplating solution: dissolve cobalt sulfate, nickel chloride, sodium phosphate, boric acid, ammonium citrate, and graphene oxide into deionized water to make a composite electroplating solution; among them, the concentration of cobalt sulfate is 100g / L, The concentration of nickel chloride is 100g / L, the concentration of sodium phosphate is 20g / L, the concentration of boric acid is 30g / L, the concentration of ammonium citrate is 30g / L, and the concentration of graphene oxide is 0.5g / L. Sodium oxide and dilute sulfuric acid adjust the pH value of the plating solution to 4.

[0039] 2. The anode is a nickel sheet, and the cathode is a No. 45 steel substrate that has undergone degreasing-cleaning-acid activation. The distance between the two electrodes is 4cm. The above-mentioned anode and cathode are immersed in the electroplating solution obtained in step S1. After 30 minutes of ultrasonic vibration in the vibrator, pulse current was used for ...

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Abstract

The invention discloses a graphene oxide / cobalt-based composite plating as well as a preparation method and application thereof. The preparation method comprises the following steps: soaking cobalt, nickel or a cobalt-nickel alloy serving as a positive electrode and a workpiece to be plated serving as a negative electrode in a composite electroplating solution for ultrasonic oscillation; performing electro-deposition on the workpiece to be plated by adopting pulse current to obtain the graphene oxide / cobalt-based composite plating, wherein the composite electroplating solution is prepared from30 to 200 g / L of cobalt salt, 30 to 200 g / L of nickel salt, 5 to 80 g / L of phosphate, 10 to 60 g / L of boric acid, 10 to 50 g / L of a complexing agent, and 0.1 to 5 g / L of graphene oxide and the balance of deionized water. The preparation method is simple, efficient and environmentally friendly. The composite plating has the advantages of high hardness, superior wear resistance and corrosion resistance, and can be widely applied to various mechanical parts which have high requirements on hardness, wear resistance, low friction coefficient and high corrosion resistance as a functional protectionlayer.

Description

technical field [0001] The invention belongs to the technical field of surface functional film materials, and more specifically relates to a graphene oxide / cobalt-based composite coating and its preparation method and application. Background technique [0002] Metal materials are the most widely used engineering materials today, and the wear, corrosion and fracture failure of metal parts bring huge losses to the economy. In fact, the failure of metal materials mainly starts from its surface. As long as a certain thickness of functional protective layer is obtained on the surface through surface engineering technology, the comprehensive performance of metal materials can be effectively improved and its service life can be extended. Electrodeposition technology is widely used in the deposition of high hardness, wear resistance, corrosion resistance, heat resistance and beautiful coating materials on the surface of metal parts due to its advantages of simple operation, cost-eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00C25D3/56
CPCC25D3/562C25D15/00
Inventor 刘灿森揭晓华魏冬冬麦永津张留艳
Owner GUANGDONG UNIV OF TECH
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