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Preparation method and application of polypyrrole/phytic acid/graphene oxide composite anti-corrosion coating

A graphene composite and composite coating technology, which is applied in the field of metal anti-corrosion and anti-corrosion coating of metal materials, can solve problems such as poor adhesion, pore defects, and lack of good stability, and achieve enhanced bonding force and high Anti-corrosion stability, the effect of good anti-corrosion stability

Active Publication Date: 2020-10-30
SUZHOU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of polypyrrole / phytic acid / graphene oxide composite anti-corrosion coating, to solve the pore defects, poor adhesion, and lack of good stability in the current conductive polymer anti-corrosion coating. sexual issues

Method used

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  • Preparation method and application of polypyrrole/phytic acid/graphene oxide composite anti-corrosion coating
  • Preparation method and application of polypyrrole/phytic acid/graphene oxide composite anti-corrosion coating

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preparation example Construction

[0031]A kind of preparation method of polypyrrole / phytic acid / graphene oxide composite anticorrosion coating disclosed by the present invention, it comprises the following steps:

[0032] (1) adopt improved Hummers method to prepare graphene oxide, it is uniformly dispersed in deionized water, obtain graphene oxide dispersion liquid;

[0033] (2) Disperse the pyrrole monomer and phytic acid in deionized water, then add the graphene oxide dispersion, stir until uniform, and prepare a mixed electrolyte;

[0034] (3) Using a three-electrode method, using the mixed electrolyte as a supporting solution, electrodepositing a composite coating to obtain the polypyrrole / phytic acid / graphene oxide composite anti-corrosion coating.

[0035] Wherein, the improved Hummers method to prepare graphene oxide specifically includes processes such as oxidation of graphite powder, suction filtration, washing, freeze-drying, grinding, and probe-type ultrasound. More specifically, the mass of graph...

Embodiment 1

[0037] Disperse the pyrrole monomer and phytic acid in deionized water, then add the graphene oxide dispersion, and stir it magnetically for 10 minutes to prepare a uniform mixed electrolyte, in which the concentration of the pyrrole monomer is 0.4mol / L, and the solubility of phytic acid is 0.068mol / L, graphene oxide concentration is 0.25mg / mL;

[0038] The non-working surface of the stainless steel sheet with an area of ​​10mm×10mm is encapsulated by epoxy resin, while leaving the contact area of ​​the electrode clip, and the working area is polished with 400, 800, 1200, and 2000 mesh SiC sandpaper in sequence, and then deionized Wash with water, acetone and ethanol, and finally dry;

[0039] At room temperature, a three-electrode system is used to prepare the coating by constant current electrodeposition in the above mixed electrolyte, wherein the reference electrode is a saturated calomel electrode, the counter electrode is a platinum sheet electrode, and the working elect...

Embodiment 2

[0052] Disperse the pyrrole monomer and phytic acid in deionized water, then add the graphene oxide dispersion mother liquor, and stir magnetically for 15 minutes under dark conditions, and prepare a well-mixed pyrrole monomer with a concentration of 0.4mol / L and a solubility of phytic acid of 0.1 mol / L, a mixed electrolyte with a graphene oxide concentration of 0.25mg / mL;

[0053] Encapsulate the non-working surface of a stainless steel sheet with an area of ​​10mm×10mm with epoxy resin, and leave the contact area of ​​the electrode clip on the top, use 400, 800, 1200, 2000 mesh SiC sandpaper to polish the working area in turn, and then use deionized water in turn , acetone and ethanol to clean and degrease, and finally dry;

[0054] At room temperature, a three-electrode system is used to prepare the coating by constant current electrodeposition in the above mixed electrolyte, wherein the reference electrode is a saturated calomel electrode, the counter electrode is a platin...

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Abstract

The invention discloses a preparation method and application of a polypyrrole / phytic acid / graphene oxide composite anti-corrosion coating. The preparation method comprises the following steps: systematically adjusting and controlling the concentration and ratio of pyrrole monomer, phytic acid and graphene oxide dispersion liquid, and carrying out direct electro-deposition of the composite coatingmaterial on the surface of stainless steel through the convenient one-step galvanostatic method. The polypyrrole / phytic acid / graphene oxide composite anti-corrosion coating is applied to corrosion protection of stainless steel in an acid environment to solve the problems that an existing conducting polymer anti-corrosion coating has micropores and is poor in adhesive force and does not have high stability. The preparation method is simple and can realize direct, rapid and large-area deposition of the coating material on the surface of stainless steel; and in addition, the coating is dense in structure and stable in anti-corrosion performance, and has excellent application prospect in the stainless steel material used in an oil and gas well and acid soil and a metal bipolar plate of a fuelcell.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion coatings for metal materials, in particular to a preparation method and application of a polypyrrole / phytic acid / graphene oxide composite anti-corrosion coating, which belongs to the field of metal anti-corrosion. Background technique [0002] Stainless steel is an iron-based alloy rich in chromium. It has a wide range of applications in industry and energy because of its high strength and fracture toughness, excellent passivation performance and electrical conductivity. However, when working in an environment containing corrosive substances for a long time, the corrosion of stainless steel is still inevitable, which will cause serious waste of resources and environmental pollution. Anti-corrosion coating is currently one of the most important methods to improve the corrosion resistance of stainless steel. Conductive polymer coatings are a class of coating systems that are environmentally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00C25D9/02C25D9/04
CPCC25D15/00C25D9/02C25D9/04
Inventor 蒋莉袁妍李继航周兴董延茂
Owner SUZHOU UNIV OF SCI & TECH
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