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Method for improving corrosion resistance of magnesium alloy by adopting nitrogen doped graphene quantum dot coating

A technology of graphene quantum dots and magnesium alloys, applied in metal material coating process, electrolytic inorganic material coating, etc., can solve the problems of poor anti-corrosion effect on the surface of magnesium alloys, and achieve simple operation steps and equipment requirements, easy to implement , Improve the effect of corrosion resistance

Active Publication Date: 2018-11-13
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for improving the corrosion resistance of magnesium alloys by using a nitrogen-doped graphene quantum dot coating, which uses a nitrogen-doped graphene quantum dot coating The method for improving the corrosion resistance of magnesium alloys is to solve the technical problem of poor corrosion resistance on the surface of magnesium alloys in the prior art

Method used

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  • Method for improving corrosion resistance of magnesium alloy by adopting nitrogen doped graphene quantum dot coating
  • Method for improving corrosion resistance of magnesium alloy by adopting nitrogen doped graphene quantum dot coating
  • Method for improving corrosion resistance of magnesium alloy by adopting nitrogen doped graphene quantum dot coating

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Embodiment 1

[0018] 1) Preprocessing, the steps are as follows:

[0019] The AZ31 magnesium alloy was ground with sandpaper, polished, ultrasonically cleaned, rinsed with distilled water, and ultrasonically cleaned with absolute ethanol for 10 minutes.

[0020] 2) Electrodeposition of nitrogen-doped graphene quantum dot coating:

[0021] A CHI860D electrochemical workstation was used to assemble a three-electrode system, the AZ31 magnesium alloy pretreated in step 1) was used as the working electrode, the platinum electrode was used as the auxiliary electrode, and the saturated calomel electrode was used as the reference electrode. Take 100ml of 10mg / mL nitrogen-doped graphene quantum dot solution, carry out ultrasonic dispersion for 30 minutes and use it as electrolyte solution. Select the constant current method, the current is 0.26A, and the electrodeposition time is 10 minutes. After electrochemical deposition, the AZ31 magnesium alloy was taken out and placed in a space to dry for 1...

Embodiment 2

[0026] 1) Preprocessing, the steps are as follows:

[0027] The sample material used in Example 2 was AZ31 magnesium alloy, which was ground, polished, and ultrasonically cleaned with 2000# sandpaper, then rinsed with distilled water, and ultrasonically cleaned with absolute ethanol for 15 minutes.

[0028] 2) Electrodeposition of nitrogen-doped graphene quantum dot coating:

[0029] Use the CHI860D electrochemical workstation to assemble a three-electrode system. The AZ31 magnesium alloy pretreated in step 1) is used as the working electrode, the platinum electrode is used as the auxiliary electrode, and the saturated calomel electrode is used as the reference electrode. Take 10 mg / mL nitrogen-doped 100ml of graphene quantum dot solution was used as electrolyte solution after ultrasonic dispersion for 30 minutes. Select the constant current method, the current is 0.20A, and the electrodeposition time is 8 minutes. After electrochemical deposition, the AZ31 magnesium alloy w...

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Abstract

The invention provides a method for improving corrosion resistance of a magnesium alloy by adopting a nitrogen doped graphene quantum dot coating. The method comprises the following steps of: taking agraphene quantum solution as an electrolyte solution; adopting a tri-electrode system; taking a magnesium alloy as a working electrode; taking a saturated potassium chloride / calomel electrode as a reference electrode, taking a platinum electrode as an auxiliary electrode, electrochemically depositing a nitrogen doped graphene quantum dot on the surface of the magnesium alloy, placing the deposited nitrogen doped graphene quantum dot coating in a silylation solution, drying the magnesium alloy subjected to silylation treatment, thereby forming the nitrogen doped graphene quantum dot coating onthe surface of the magnesium alloy, wherein the silylation treatment temperature is 40-55 DEG C and the silylation standing time is 1-2 hours. According to the method provided by the invention, the nitrogen doped graphene quantum dot is uniformly and electrically deposited on the surface of the magnesium alloy, and binding force between the magnesium alloy and the nitrogen doped graphene quantumdot is improved through silylation treatment, so that the nitrogen doped graphene quantum dot coating which is high in compactness and is tightly combined is obtained on the surface of the magnesium alloy.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a metal surface treatment technology, in particular to a method for improving the corrosion resistance of a magnesium alloy by using a nitrogen-doped graphene quantum dot coating. Background technique [0002] Magnesium has a low density (its density is 1.74g / cm 3 , only 2 / 3 of aluminum and 1 / 4 of iron), and the specific strength of magnesium alloy is higher than stiffness, with excellent electromagnetic shielding performance and thermal and electrical conductivity, known as the green engineering material of the 21st century, in the communication It has broad application prospects in the fields of electronic automobile manufacturing weaponry and aerospace. However, due to the poor corrosion performance of magnesium alloys, the research on the surface anticorrosion of magnesium alloys is particularly important. Generally, corrosion-resistant coatings on the surface of magnesium all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/04C23C22/05
Inventor 陈爱英蒋宝坤王现英
Owner UNIV OF SHANGHAI FOR SCI & TECH
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