Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Graphene-doping-modified protective coating and preparing method and application thereof

A protective coating, graphene technology, applied in coatings, anti-corrosion coatings, epoxy resin coatings and other directions, can solve the problems of harsh conditions, many chemical reagents, increase production costs, etc., to achieve low cost and improve protective performance , controllable effect

Active Publication Date: 2016-06-29
ZHEJIANG UNIV
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method undoubtedly increases the complexity of the process, uses many chemical reagents, and requires harsh conditions, which greatly increases the production cost.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Graphene-doping-modified protective coating and preparing method and application thereof
  • Graphene-doping-modified protective coating and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] The preparation method steps of the protective coating modified by graphene doping are as follows:

[0028] 1) After the metal substrate is mechanically polished as required, put it in a degreasing solution at 30-60°C for 1-10 minutes, then ultrasonically at 30-60°C for 5-15 minutes, and finally wash it with tap water and deionized water in sequence, and quickly Blow dry with hot air and place in a drying box for 5-24 hours for later use;

[0029] 2) Preparation of silica precursor solution: add 50-100mL absolute ethanol, 50-100mL water, 1-10mL SiO 2 For the precursor, adjust the pH to 2.0-6.0, stir at room temperature for 2-48 hours, and set aside;

[0030] 3) Add the prepared precursor solution into the three-electrode electrolytic cell, then add 1-100mg of graphene, and stir and mix evenly with ultrasonic power of 100-200W for 1-10min. Ag / AgCl is used as the reference electrode, platinum sheet It is working electrode; Described three-electrode electrolyzer can be m...

Embodiment 1

[0042] The AA2024 aluminum alloy substrate was subjected to No. 80, No. 120, and No. 400 electrostatic sanding in sequence, and mechanically polished with No. 14 metallographic sandpaper, then put it in a degreasing solution at 60°C for 10 minutes, then ultrasonicated at 30°C for 10 minutes, and finally used tap water to remove the oil. After cleaning with deionized water, dry it quickly with hot air, and place it in a drying box for 5 hours to be used; the components of the degreasing liquid are sodium carbonate 8g / L, sodium silicate 5g / L, sodium polyphosphate 8g / L, ten Sodium dialkylsulfonate 1g / L, alkylphenol polyoxyethylene ether 5mL / L;

[0043] Precursor solution preparation: add 50mL absolute ethanol, 50mL deionized water, 5mL tetraethyl silicate, 2M nitric acid solution to adjust the pH to ~5.0, stir at room temperature for 24h, and set aside;

[0044] Add the prepared precursor solution into the special three-electrode tank, then add about 0.0020g of graphene, stir and...

Embodiment 2

[0053] The specific implementation steps are similar to those in Example 1, except that the metal substrate is replaced by low-carbon steel. The difference is that the low-carbon steel substrate does not need to be sanded, and the degreasing step is directly performed. In addition, the corrosion inhibitor was changed from BTA to thiourea suitable for steel. The protective performance of the protective film system was tested by electrochemical impedance spectroscopy (EIS), and the test solution used was 3.5wt% NaCl aqueous solution. The results show that the direct doping of graphene and thiourea in the coating has no effect on the protective performance of the coating, and the doping of electrodeposited SiO 2 The protective performance of the modified graphene epoxy coating has been significantly improved, while the use of graphene / SiO 2 Doping after adsorption of thiourea can greatly improve the protective performance of the coating. Table 2 lists the low-frequency impedanc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a graphene-doping-modified protective coating and a preparing method and application thereof.The preparing method includes the steps that a rough-porous nanometer SiO2 film with good binding force is directly modified to the graphene surface with the electrodeposition method, then a corrosion inhibitor is loaded with the prepared powder, and the mixture is doped to the protective coating to improve the anti-corrosion effect of a coating.SiO2-loaded graphene powder is prepared in the mode that graphene is directly added into a SiO2 precursor solution, and the mixture is subjected to electrodeposition in a three-electrode system under the evenly-stirred condition.According to the method, the excellent characteristics of the graphene and porous SiO2 capable of serving as a corrosion inhibitor container are fully combined, the physical barrier effect of the inert graphene in the coating on corrosive media is developed, and it is delayed that the corrosive media get to a matrix.Meanwhile, when the matrix is corroded, the corrosion inhibitor can be released through the nanometer-porous SiO2 film loaded to the graphene, and the repair effect on the matrix is achieved.According to the graphene doping-modified protective coating and the preparing method and application thereof, the preparing technology is simple, cost is low, and the industrial application is hopefully achieved.

Description

technical field [0001] The invention relates to the field of metal protection, in particular to a preparation method and application of a metal surface protection layer modified by graphene doping and loaded with a corrosion inhibitor. Background technique [0002] As we all know, except for a small amount of inert metals (gold, platinum, etc.) in nature, most of the other metals and their alloys are prone to corrosion under natural conditions. service life. At present, the most commonly used metal protection method in the industry is to apply a protective film, and in order to further prolong the protective effect of the film layer, a corrosion inhibitor is often added to the protective layer. For example, Vignesh Palanivel (Progress in Organic Coatings, 2005, 53 (2), pp153-168) found that after adding TTA, BTA, cerium salt and other corrosion inhibitors to the silane film, it has a repairing effect on the film layer. On this basis, the German Dimitriya Borisova group (AC...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/08C09D163/00C09D175/04C09D129/14C25D9/04C25D7/00
CPCC08K3/04C08K3/36C08K5/3475C08K9/12C08K13/06C09D5/08C09D129/14C09D163/00C09D175/04C25D7/00C25D9/04C08L77/00C08K5/405
Inventor 胡吉明赵继鹏付红丽
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com