Carbon nano tube/cobalt composite coating and preparation method thereof

A technology of carbon nanotubes and composite coatings, which is applied in coatings, electrolytic coatings, etc., can solve the problems of no relevant patents and paper reports, and achieve the effects of small investment, excellent wear resistance and antifriction performance, and simple methods

Inactive Publication Date: 2012-10-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no relevant patents and paper reports on the electroplating preparation and electroplating parameter optimization of carbon nanotube-reinforced cobalt composite coatings at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of preparation method of carbon nanotube / cobalt composite coating, concrete steps are as follows:

[0025] A certain amount of carbon nanotubes is mixed in a solution of concentrated sulfuric acid (volume concentration 98%) and concentrated nitric acid (volume concentration 37%) at a volume ratio of 3:1, refluxed at 80°C for 2 hours, and then vacuum-dried as the treated carbon nanotube.

[0026] Configuration prepares the electroplating solution of carbon nanotube / cobalt composite coating, and its component is to comprise in every liter of plating solution: cobalt sulfate 100g, anhydrous sodium sulfate 100g, boric acid 30g, sodium dodecylbenzenesulfonate 0.10g, sodium saccharin 2g, 30g sodium citrate, 5g treated carbon nanotubes, repeatedly adjust the pH value to 6.5 with sodium hydroxide and dilute sulfuric acid, and the rest is distilled water.

[0027] Electroplating was carried out after the above electroplating solution was ultrasonically oscillated for 30 ...

Embodiment 2

[0029] A kind of preparation method of carbon nanotube / cobalt composite coating, concrete steps are as follows:

[0030] A certain amount of carbon nanotubes was placed in a solution of concentrated sulfuric acid and concentrated nitric acid at a volume ratio of 1:1, refluxed at 80° C. for 10 hours, and then vacuum-dried to obtain treated carbon nanotubes.

[0031] Configuration prepares the electroplating solution of carbon nanotube / cobalt composite coating, and its composition is to comprise in every liter of plating solution: cobalt sulfate 150g, anhydrous sodium sulfate 100g, boric acid 30g, sodium dodecylbenzenesulfonate 0.15g, sodium saccharin 2g, 45g of sodium citrate, 10g of treated carbon nanotubes, adjust the pH value to 6.8 with sodium hydroxide and dilute sulfuric acid, and the rest is distilled water.

[0032] Electroplating was carried out after the above electroplating solution was ultrasonically oscillated for 60 min in an ultrasonic oscillator with a power of ...

Embodiment 3

[0035]A kind of preparation method of carbon nanotube / cobalt composite coating, concrete steps are as follows:

[0036] A certain amount of carbon nanotubes was placed in a solution of concentrated sulfuric acid and concentrated nitric acid at a volume ratio of 3:1, refluxed at 80° C. for 8 hours, and then vacuum-dried to obtain treated carbon nanotubes.

[0037] Configuration prepares the electroplating solution of carbon nanotube / cobalt composite coating, and its component is to comprise in every liter of plating solution: cobalt sulfate 112g, anhydrous sodium sulfate 100g, boric acid 30g, sodium dodecylbenzenesulfonate 0.10g, sodium saccharin 1g, 30g of sodium citrate, 5g of treated carbon nanotubes, adjust the pH value to 7.0 with sodium hydroxide and dilute sulfuric acid, and the rest is distilled water.

[0038] Electroplating was carried out after the above electroplating solution was ultrasonically oscillated for 20 min in an ultrasonic oscillator with a power of 300w....

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Abstract

The invention discloses a carbon nano tube / cobalt composite coating and a preparation method thereof. The preparation method comprises the steps of taking platinum net as an anode and a to-be-plated workpiece as a cathode, as well as mixed solution as plating solution, conducting ultrasonic oscillation treatment to the plating solution, and electroplating, wherein the mixed solution comprises compositions as follows in mass concentration: 50-200g / l of cobalt salt, 4-20g / l of carbon nano tube, 50-150g / l of sodium salt, 10-50g / l of boric acid, 1-4g / l of saccharin sodium, 0.01-0.2g / l of a surface active agent, 10-100g / l of a complexing agent and the balance of distilled water. In the composite coating, cobalt has a nanocrystalline structure, the grain size is 10-40nm, the cobalt content is 70-85wt%, the carbon content is 5-12wt%, and the oxygen content is 10-18wt%. The preparation method is simple, the coating not only is high in hardness, but also is excellent in wear resistance and friction reduction properties. The carbon nano tube / cobalt composite coating is applicable to components required with high hardness, high wear resistance and low friction coefficient.

Description

technical field [0001] The invention relates to the technical field of preparation of nano functional thin film materials, in particular to a carbon nanotube / cobalt composite coating and a preparation method thereof. The coating of the invention not only has high hardness, but also has excellent wear resistance and antifriction properties. It is suitable for parts requiring high hardness, high wear resistance and low friction coefficient, and has a wide range of applications in the fields of automobiles, machinery, precision manufacturing and aerospace. Background technique [0002] With the rapid development of modern automobile industry, machinery industry, aviation and aerospace industry, more and more high-load cylinder pistons and sliding parts are used under the action of dry friction, hydraulic pressure and lubricating oil medium. Electroplating coating materials with high hardness, high temperature resistance, corrosion resistance and fatigue wear resistance on the ...

Claims

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Application Information

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IPC IPC(8): C25D3/12C25D5/18C25D15/00
Inventor 苏峰华刘灿森郭佳丽黄平
Owner SOUTH CHINA UNIV OF TECH
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