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Graphene-coated aluminum composite coating, preparation method and application thereof

A graphene coating, aluminum composite technology, applied in transportation and packaging, metal processing equipment, pressure inorganic powder coating and other directions, can solve problems such as accelerated corrosion of magnesium alloy substrates, avoid pipe blockage, compensate for local corrosion, improve The effect of spraying efficiency

Active Publication Date: 2019-03-08
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cold-sprayed aluminum-based coatings on magnesium alloys have attracted the most attention because of their low cost and good protective effect. However, due to the strong activity of magnesium alloys, it is necessary to have a high density of the coating structure, otherwise the slight coating Defects are also likely to cause accelerated corrosion of the magnesium alloy matrix

Method used

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  • Graphene-coated aluminum composite coating, preparation method and application thereof
  • Graphene-coated aluminum composite coating, preparation method and application thereof
  • Graphene-coated aluminum composite coating, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Coating of aluminum powder: weigh 0.02g graphene oxide, put into 100mL deionized water and disperse to a clear and transparent solution, and obtain a graphene oxide aqueous solution with a concentration of 0.2g / L; weigh 20g aluminum powder (10 ~40μm) into the dispersed graphene oxide aqueous solution with a concentration of 0.2g / L and magnetically stirred. After reacting for 300s, filter off the excess water and wash the above-mentioned graphene-coated powder with alcohol and filter again. Bake it down for 18 hours to obtain a graphene-coated aluminum powder with a graphene mass fraction of 0.1 wt%.

[0033] 2. Surface roughening of the substrate: use YT-9060 sandblasting machine to sandblast the surface of the magnesium alloy. After sanding and sanding, the surface roughness is 5-10Ra.

[0034] 3. Surface cleaning: Put the substrate treated in step 2 into alcohol and ultrasonically clean it for 20 minutes to remove oil and impurities, and dry it for later use.

[...

Embodiment 2

[0044] The aluminum powder coating process and the coating preparation steps are the same as in Example 1, the difference being that the graphene oxide weighed is 0.03g, the concentration of the graphene oxide aqueous solution is 0.3g / L, and the graphene mass fraction obtained is 0.15 Wt% graphene-coated aluminum powder; the reaction time of aluminum powder in the solution is 400s; the blasting gas pressure is 0.6MPa, the blasting angle is 85°, or polished with 200 mesh sandpaper; cold spraying process parameters: working pressure is 0.8Mpa, the gas temperature is 400°C, the moving speed of the nozzle relative to the sample is 100mm / min, the distance between the bottom of the nozzle and the surface of the sample is 20mm, and the powder feeding rate is 0.2g / s.

Embodiment 3

[0046] The aluminum powder coating process and the coating preparation steps are the same as in Example 1, the difference is that the weighed graphene oxide amount is 0.04g, the concentration of the graphene oxide aqueous solution is 0.4g / L, and the obtained graphene mass fraction is 0.2 Wt% graphene-coated aluminum powder; the reaction time of aluminum powder in the solution is 450s; the blasting gas pressure is 0.65MPa, the blasting angle is 80°, or polished with 400 mesh sandpaper; cold spraying process parameters: working pressure is 0.65Mpa, the gas temperature is 450°C, the moving speed of the nozzle relative to the sample is 200mm / min, the distance between the bottom of the nozzle and the surface of the sample is 10mm, and the powder feeding rate is 0.4g / s.

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Abstract

The invention belongs to the technical field of metal surface treatment, and discloses a graphene-coated aluminum composite coating, a preparation method and application thereof. The preparation method comprises the steps that aluminium powders are put into a graphene oxide aqueous solution and are subjected to a mixing reaction, and thus graphene-coated aluminium powders are obtained; a metal surface is subjected to roughness fabrication adopting a method of mechanical treatment, and the metal surface with roughness is obtained after being cleaned and dried; a cold spraying device is started,and the graphene-coated aluminium powder is put into a specified powder feeding tube; and the metal surface with roughness is installed on a specific fixture, a cold spraying technological parameteris set, and the spraying device is started to deposit the composite graphene-coated aluminium powders on the metal surface with roughness, and the preparation of the graphene-coated aluminum compositecoating is carried out. According to the aluminium powders coated through the preparation method, the surface hardness is improved, the fluidity is better, and the phenomenon of tube plugging duringspraying is avoided, and thus the spraying efficiency is improved. The structure of the graphene-coated aluminum composite coating has high compactness, can efficiently insulate eroding ions, has higher corrosion resistance and can be used in the field of corrosion prevention.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and more specifically relates to a graphene-coated aluminum composite coating, a preparation method and application thereof. Background technique [0002] Magnesium alloys have broad application prospects in the fields of automobiles, electronic communications, aerospace, and biomedicine due to their high specific strength, excellent cutting processing, casting properties, and biocompatibility. The resulting poor corrosion resistance severely limits its application. Surface coating protection is the most commonly used and efficient protection method for magnesium alloys, mainly including: electroplating, vapor deposition, thermal spraying, plasma spraying and organic coating, etc. These methods have pollution, complicated process, many coating defects or insufficient protection effect And other issues. Low-pressure cold spraying is a new method of preparing protective coatings d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04B22F1/02
CPCC23C24/04B22F1/16
Inventor 张留艳王秀金揭晓华麦永津
Owner GUANGDONG UNIV OF TECH
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