Preparation and Anticorrosion Performance of 2-6 Diaminopyridine Modified Graphene Oxide Composite Coating

GUO Hongfei, ZHAO Zengqi, CHAO Bao, NAN Ding, LIU Jingshun

China Surface Engineering ›› 2022, Vol. 35 ›› Issue (2) : 126-139.

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China Surface Engineering ›› 2022, Vol. 35 ›› Issue (2) : 126-139. DOI: 10.11933/j.issn.1007-9289.20210617002

Preparation and Anticorrosion Performance of 2-6 Diaminopyridine Modified Graphene Oxide Composite Coating

  • GUO Hongfei, ZHAO Zengqi, CHAO Bao, NAN Ding, LIU Jingshun
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Abstract

The addition of graphene materials as fillers to polymer coatings can effectively improve the anticorrosion properties of coatings. To improve the dispersion of graphene oxide and obtain a composite coating with high anticorrosion performance, 2-6 diaminopyridine is used as a modifier to prepare the modified GO composite (BGO). The effects of modification temperature and the proportion of modifiers on the preparation and anticorrosion performance of BGO are analyzed. The modified GO composite coating (BGO / EP) is prepared by adding BGO to epoxy resin. The influence of the addition amount of BGO on the anticorrosion performance of the composite coating is investigated, and the anticorrosion mechanism of the coating is revealed. The results of XRD, Raman, FT-IR, SEM, AFM and TEM show that 2-6 diaminopyridine is successfully grafted onto GO surface. The best modification effect of GO is obtained when the reaction temperature is 80 ℃ and the ratio of modifier to GO is 1∶5. The results of electrochemical test, salt spray test and adhesion test show that the addition of BGO significantly improves the corrosion resistance of epoxy resin, and the best effect is obtained when the addition amount is 0.1 wt.%. After soaking in 3.5% NaCl solution for 10 d, the coating resistance of BGO / EP still reaches 1.03 G?·cm2 , which is 5 orders of magnitude higher than the 38.9 k?·cm2 of pure epoxy resin coating, 4 orders of magnitude higher than the 262 k?·cm2 of GO / EP composite coating, the anticorrosion performance of coating is significantly improved. The research results can lay a foundation for further optimizing the preparation process of graphene-based anticorrosion coatings, exploring the dispersion effect of amino modified graphene oxide composites in epoxy resin, and exploring its mechanism of action in the coating system.

Key words

2-6 diaminopyridine; graphene oxide; amino modification; anticorrosion coating

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GUO Hongfei, ZHAO Zengqi, CHAO Bao, NAN Ding, LIU Jingshun. Preparation and Anticorrosion Performance of 2-6 Diaminopyridine Modified Graphene Oxide Composite Coating[J]. China Surface Engineering, 2022, 35(2): 126-139 https://doi.org/10.11933/j.issn.1007-9289.20210617002

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Funding

Supported by Science and Technology Plan Project in Guangzhou (202002030321);Science and Technology Plan Project in Inner MongoliaAutonomous Region (2019GG238);Guangdong Academic Degree and Graduate Education Reform Research Project (2019JGXM15);Guangdong ProvinceHigher Education Teaching Research and Reform Project (2020059);Guangdong Graduate Education Innovation Project (82620516);Guangzhou LeadingInnovation Team Program (201909010006).
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