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A kind of preparation method of graphene-reinforced iron-based composite material

An iron-based composite material and graphene technology, applied in electrolytic coatings, coatings, etc., can solve the problems of easy corrosion, low temperature resistance, and easy peeling of electroplated pure iron coatings, and achieve low cost, easy operation, and simple process flow Effect

Active Publication Date: 2020-04-14
SUZHOU INSTITUE OF WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] As a repair method for mechanical parts, DC electroplating technology has been successfully applied in transportation, mining equipment and machinery manufacturing due to its characteristics of fast deposition speed, high current efficiency, simple process, low production cost and basically no pollution. The repair of mechanical wear parts or processing out-of-tolerance parts in other industries has achieved good economic and social benefits. However, electroplated pure iron has the disadvantages of easy peeling of the coating, low temperature resistance, and easy corrosion.

Method used

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  • A kind of preparation method of graphene-reinforced iron-based composite material
  • A kind of preparation method of graphene-reinforced iron-based composite material
  • A kind of preparation method of graphene-reinforced iron-based composite material

Examples

Experimental program
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Embodiment 1

[0023] The average particle size of graphite powder in this embodiment is 325 mesh. The Hummer method is used to prepare graphene oxide. The specific steps are as follows: First, weigh 0.2g graphite and 0.5g K 2 S 2 O 4 , 0.5g P 2 O 5 , Measure 2 ~ 4mL concentrated sulfuric acid, mix together and put it in a water bath equipment at 80°C and continue to stir for 4 hours before taking it out. Add 12mL concentrated sulfuric acid to the treated solution, and slowly add 2g KMnO 4 , And always keep the temperature below 20℃, add KMnO 4 Then, the temperature was kept at 35°C and stirred for 2 hours. Then, 25 mL of distilled water was added, and after the exotherm was completed, the resultant was added to 70 mL of distilled water and maintained at 60-70°C for 1 hour. Add 3mL hydrogen peroxide to the solution to remove excess KMnO 4 , Use alcohol to clean the sample to pH = 7, use ultrasonic dispersion for 1 hour, dry the solution at 40 ~ 70 ℃ to obtain graphene oxide, such as figure 1 ...

Embodiment 2

[0025] The experimental conditions for chemical exfoliation of graphene are the same as in Example 1. After the graphene oxide is obtained, it is ground into a finer powder, and 0.05g, 0.1g, 0.15g, 0.2g, and 0.25g GO are respectively weighed and added to 10mL , 20mL, 30mL, 40mL, 50mL of iron plating electrolyte, and then add 5ppm, 10ppm, 15ppm, 20ppm, 25ppm of polyacrylic acid respectively, ultrasonic dispersion for 30min, obtain graphene oxide suspension; add graphene oxide suspension to Sheng In the beaker with the iron plating electrolyte, ultrasonic dispersion is performed for 30 minutes to obtain a graphene oxide suspension with a preset concentration.

Embodiment 3

[0027] The experimental conditions of the graphene oxide suspension were the same as in Example 2. After obtaining the 0.1g / L graphene oxide suspension, pure iron sheets were used as the cathode, and stainless steel was used as the anode. The area ratio of the cathode to the anode was 1:2. Before the experiment, the pure iron sheets were polished with 400#, 600#, 800#, 1200# sandpaper respectively, and then etched in 30% (volume fraction) hydrochloric acid for 30s, and then electroplating experiments were carried out. The composition of the iron plating electrolyte: FeCl 2 ·4H 2 O: 350g / L, NH 4 Cl: 30g / L, MnCl 2 : 5g / L, sodium lauryl sulfate 0.1g / L, saccharin 0.1g / L, use dilute hydrochloric acid to adjust the pH to 1-2, the current density is 1A / dm 2 , Temperature 40℃, electroplating time: 20min, magnetic stirring: 1000rpm, GO dosage: 0.1g / L. Finally, graphene reinforced iron-based composite materials are obtained.

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Abstract

The invention provides a method for preparing a high-strength and high-corrosion-resistance graphene enhanced iron-based composite material at the low temperature lower than 80 DEG C through an electroplating method. The method comprises the steps that precursor oxidized graphene (GO) is ultrasonically scattered into an iron-plating electrolyte, stable oxidized graphene suspension liquid is formed, the proper direct current is conducted, Fe<2+> and oxidized graphene are subjected to co-deposition, and the graphene enhanced iron-based composite material is formed on a cathode. According to thegraphene enhanced iron-based composite material, the characters of high strength, high abrasion resistance, high corrosion resistance and the like of graphene are effectively utilized, advantage complementing and strengthening of component materials are achieved, and the mechanical performance, corrosion resistance and other performance of an iron-based clad layer are greatly improved. The methodhas the beneficial effects that the technology is simple, operation is easy, performance is greatly improved, environment friendliness is achieved, and industrial application can be achieved; and themethod can have wide application prospects in the fields of machine abraded component repairing, chemical engineering, military, oceanographic engineering, aerospace and the like.

Description

Technical field [0001] The invention relates to a preparation technology of graphene-enhanced iron-based composite materials, in particular to disperse graphene oxide in an iron electroplating solution, obtain graphene-enhanced iron-based composite materials by a direct current electroplating method, and improve the mechanical properties and resistance of the composite materials. The corrosion performance is significantly enhanced. Background technique [0002] Graphene (Gr) is a two-dimensional honeycomb structure formed by sp2 hybridization of carbon atoms. It is the thinnest material found so far. From the structural point of view, graphene can be called the basic unit of other carbon materials. This unique two-dimensional structure gives graphene extremely excellent physical, chemical, and mechanical properties. For example, single-layer graphene is the thinnest material in the world, with a thickness of only 0.335nm; graphene is currently known to have the highest strength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D15/00C25D3/20
CPCC25D3/20C25D15/00
Inventor 潘春旭宋贡生杨延鹏
Owner SUZHOU INSTITUE OF WUHAN UNIV
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