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Modified graphene oxide/cobalt-based composite coating and preparation method and application thereof

A technology of composite coating and oxide stone, applied in the direction of coating, electrolytic coating, etc., can solve the problems of curling and wrinkles, poor stability of two-dimensional structure, and agglomeration of dispersion system, so as to reduce the friction coefficient and wear rate, not easy to agglomerate, Effect of improving corrosion resistance

Active Publication Date: 2019-11-08
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current problem is that graphene oxide sheets are prone to spontaneous curling and wrinkling due to their poor stability in the two-dimensional structure, which makes them prone to agglomeration and sedimentation in the dispersion system.
However, there are currently domestic and international research on the use of nano-Al 2 o 3 There are few patents and literature reports on the modification of graphene oxide by particles to improve its dispersion in the plating solution, so as to prepare anti-wear, anti-friction and corrosion-resistant integrated graphene oxide / cobalt-based composite coatings

Method used

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  • Modified graphene oxide/cobalt-based composite coating and preparation method and application thereof
  • Modified graphene oxide/cobalt-based composite coating and preparation method and application thereof
  • Modified graphene oxide/cobalt-based composite coating and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0033] 1. Modified graphene oxide: Mix 1g / L alumina and 0.1g / L 3-aminopropyltriethoxysilane in absolute ethanol, stir at 200rpm for 60min, then filter and dry to obtain amino Aluminum oxide powder, graphene oxide powder and aminated aluminum oxide powder were added to deionized water, 50W ultrasonic vibration for 60min to disperse, and then stirred at 300rpm for 30min to obtain modified graphene.

[0034] 2. Dissolve cobalt sulfate, sodium phosphate, boric acid, sodium gluconate, cetyltrimethylammonium bromide, and modified graphene oxide into deionized water, and configure a composite electroplating solution; wherein, the concentration of cobalt sulfate is 50g / L, the concentration of sodium phosphate is 80g / L, the concentration of boric acid is 60g / L, the concentration of sodium gluconate is 40g / L, the concentration of cetyltrimethylammonium bromide is 1g / L, and modified graphite oxide Alkene 0.1g / L, adjust the pH value of the electroplating solution to 3 with sodium hydroxi...

Embodiment 2

[0037] 1. Modified graphene oxide: Mix 2g / L alumina and 0.2g / L 3-aminopropyltriethoxysilane in alcohol, stir at 300rpm for 60min and filter to obtain aminated alumina. Graphene oxide powder and aminated alumina powder were added into deionized water, dispersed by 80W ultrasonic vibration for 60min, and then stirred at 300rpm for 60min to obtain modified graphene oxide.

[0038] 2. Dissolve cobalt sulfate, sodium hypophosphite, boric acid, sodium citrate, sodium lauryl sulfate, and modified graphene oxide into deionized water to make a composite electroplating solution; wherein, the concentration of cobalt sulfate is 100g / L , The concentration of sodium hypophosphite is 20g / L, the concentration of boric acid is 20g / L, the concentration of sodium citrate is 40g / L, the concentration of sodium lauryl sulfate is 1g / L, and the concentration of modified graphene oxide is 0.1g / L , adjust the pH of the plating solution to 3 with sodium hydroxide and dilute sulfuric acid.

[0039] 3. T...

Embodiment 3

[0048] 1. Modified graphene oxide: Mix 1g / L alumina and 0.1g / L 3-aminopropyltriethoxysilane in alcohol, stir at 600rpm for 60min and filter to obtain aminated alumina. Graphene oxide powder and aminated alumina powder were added into deionized water, dispersed by 80W ultrasonic vibration for 30min, and then stirred at 600rpm for 30min to obtain modified graphene.

[0049] 2. Dissolve cobalt sulfate, sodium phosphate, boric acid, ammonium citrate, sodium lauryl sulfate, and modified graphene oxide into deionized water to make a composite electroplating solution; wherein the concentration of cobalt sulfate is 150g / L, The concentration of sodium phosphate is 80g / L, the concentration of boric acid is 40g / L, the concentration of ammonium citrate is 40g / L, the concentration of sodium lauryl sulfate is 0.1g / L, and the concentration of modified graphene oxide is 0.5g / L. Adjust the pH of the plating solution to 4 with sodium hydroxide and dilute sulfuric acid.

[0050] 3. Take the ano...

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Abstract

The invention discloses a modified graphene oxide / cobalt-based composite coating and a preparation method and application thereof. The composite coating is prepared by taking cobalt, graphite or platinum mesh as an anode and a workpiece to be plated as a cathode, immersing the anode and the cathode in a composite plating solution, performing ultrasonic vibration, and performing electrodeposition on the workpiece to be plated by using pulse current, specifically, the composite plating solution per liter comprises, by volume, 30-200 g of cobalt salt, 5-80 g of phosphate, 10-60 g of boric acid, 10-50 g of a complexing agent, 0.1-1 g of surfactant, 0.1-0.5 g of modified graphene oxide, and the balance deionized water. The problems that graphene oxide has poor dispersibility and is prone to agglomeration in the composite electroplating solution are effectively solved, graphene oxide is uniformly and firmly combined in the composite coating along with electrodeposition of metal ions, and theprepared modified graphene oxide / cobalt-based composite coating has excellent lubrication and wear resistance.

Description

technical field [0001] The invention belongs to the technical field of material surface engineering, and more specifically relates to a modified 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. Using electroplating technology to deposit a layer of metal-based composite coating with excellent performance on metal materials can effectively improve the overall performance of metal materials and greatly reduce their wear and corrosion, which has aroused the interest of researchers. The properties of metal matrix composite coatings largely depend on the degree of uniform dispersion of the reinforcing phase in the matrix. Graphene oxide has been widely used to improve the comprehensive performance of composite coatings due to its excellent propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00C25D5/18
CPCC25D15/00C25D5/18
Inventor 魏冬冬刘灿森揭晓华麦永津张留艳
Owner GUANGDONG UNIV OF TECH
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