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Preparation method of metal surface graphene/polypyrrole protective composite film

A composite film and metal surface technology, applied in electrolytic inorganic material plating, electrolytic coating, coating, etc., can solve the problems of poor solubility and plasticity of conductive polymers, loss of oxidative properties of polypyrrole films, and restrictions on the application of conductive polymers. Achieve the effects of avoiding difficult dissolution, novel design and good corrosion resistance

Inactive Publication Date: 2015-05-06
QINGDAO HUAGAO GRAPHENE CORP LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that conductive polymers used in corrosion protection coatings can achieve good anti-corrosion effects because conductive polymers can induce metal surface passivation to form a good anti-corrosion layer, but due to the poor solubility and plasticity of conductive polymers , so the application of conductive polymers in metal protection is severely limited
In the prior art, YanHua Lei et al. (YanHua Lei, Nan Sheng et al.Corrosion Science: Electrochemical synthesis of polypyrrole films on copper from physical solution for corrosion protection, 2013, 76:302-309) used electrochemical deposition in A layer of polypyrrole film was deposited on the copper surface. By studying its corrosion behavior in NaCl solution, it was shown that the polypyrrole film can significantly improve the corrosion performance of metal copper, but as time goes on, the oxidation properties of the polypyrrole film are gradually lost. resulting in reduced corrosion resistance

Method used

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  • Preparation method of metal surface graphene/polypyrrole protective composite film
  • Preparation method of metal surface graphene/polypyrrole protective composite film
  • Preparation method of metal surface graphene/polypyrrole protective composite film

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Effect test

Embodiment 1

[0020] The specific steps of the preparation method of the metal surface graphene / polypyrrole protective composite film involved in this implementation are:

[0021] (1) Pre-oxidation process: After mixing 2g of natural graphite, 1g of phosphorus pentoxide, 10ml of concentrated sulfuric acid with a mass fraction of 98% and 1g of potassium persulfate and stirring evenly, pre-oxidize at a temperature of 80-90°C for 0.5-18h, Then cool naturally to room temperature (20-25°C) and place for 6-8h, then add distilled water to dilute, filter with suction and wash with water until neutral, and obtain pre-oxidized graphite after drying;

[0022] (2) Oxidation process: After mixing and stirring the pre-oxidized graphite and 46ml concentrated sulfuric acid evenly, use an ice bath device to control the reaction system, slowly add 6g of potassium permanganate powder under the condition of 10-20°C and keep stirring, then put the reaction system on the Stir and react in an oil bath at 35-38°C ...

Embodiment 2

[0028] Take 20 mg of graphene oxide (or measure a certain volume according to the concentration of the calibrated graphene oxide dispersion (quantitatively to about 1 mg / ml)), and use an ultrasonic cleaner to sonicate for 15 to 20 minutes to obtain a uniform graphene oxide dispersion. Liquid; measure 20mg pyrrole monomer, add dropwise in the above-mentioned graphene oxide dispersion liquid, make the weight ratio of graphene oxide and pyrrole 1:1, obtain uniform graphene oxide pyrrole dispersion liquid (abbreviation dispersion liquid) through magnetic stirring , Nitrogen was passed through the above dispersion liquid for 30 min; carbon steel sheet, saturated silver chloride electrode and platinum electrode were put into the dispersion liquid, and a voltage of 0.8 V was applied for 5 min by using an electrochemical workstation (Shanghai Chenhua CHI 760D type). Form a graphene / polypyrrole protective composite film (hereinafter referred to as the composite film) on the surface of t...

Embodiment 3

[0030] Take 20 mg of graphene oxide (or measure a certain volume according to the concentration of the calibrated graphene oxide dispersion (quantitatively to about 1 mg / ml)), and use an ultrasonic cleaner to sonicate for 15 to 20 minutes to obtain a uniform graphene oxide dispersion. Liquid; measure 20mg pyrrole monomer, add dropwise in the above-mentioned graphene oxide dispersion liquid, make the weight ratio of graphene oxide and pyrrole 1:1, obtain uniform graphene oxide pyrrole dispersion liquid (abbreviation dispersion liquid) through magnetic stirring , Nitrogen was passed through the dispersion liquid for 30 min; copper flakes, saturated silver chloride electrodes and platinum electrodes were put into the dispersion liquid, and a voltage of 1.2 V was applied for 1 min by using an electrochemical workstation (Shanghai Chenhua CHI 760D type), and the electrodeposited Form a graphene / polypyrrole protective composite film (hereinafter referred to as the composite film) on ...

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Abstract

The invention belongs to the technical field of metal protection, and relates to a preparation method of a graphene / polypyrrole protective composite film and application of the graphene / polypyrrole protective composite film on different metal surfaces. The preparation method comprises the steps of preoxidation, oxidation, compounding, electrodeposition and electroreduction. The electrodeposition is adopted to deposit the graphene oxide and polypyrrole on the metal surface to form a composite film, and the electrochemical reduction is performed to obtain the high-corrosion-resistance conductive polymer film. The method comprehensively utilizes the advantages of the graphene and conductive polymer, and overcomes the defects of low solubility and difficulty in processing of the conductive polymer. The method has the advantages of novel design, scientific principle, simple process, simple operation, high preparation efficiency, favorable corrosion resistance, no pollution and no waste.

Description

Technical field: [0001] The invention belongs to the technical field of metal protection, and relates to a composite anti-film used on metal surfaces, in particular to a preparation method of a graphene / polypyrrole protective composite film and its application for protection on different metal surfaces. Background technique: [0002] In practice, there are serious corrosion and waste phenomena in the application of metals in the fields of railways, mines, bridge construction, and shipbuilding industries. According to incomplete statistics, the direct economic losses caused by metal corrosion in my country are as high as nearly 100 billion yuan each year. Therefore, A better solution to the metal corrosion problem will bring great economic and social benefits. At present, the anti-corrosion treatment of metal surfaces generally includes the following methods: first, coating organic and inorganic compounds such as paint, plastic, rubber, asphalt, etc. on the metal surface; seco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/10C25D9/12C25D9/08
Inventor 刘敬权王福山潘东晓宋忠乾钱锋吴春艳郭洪云
Owner QINGDAO HUAGAO GRAPHENE CORP LTD
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