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Journal of Chinese Society for Corrosion and protection  2021, Vol. 41 Issue (2): 161-168    DOI: 10.11902/1005.4537.2020.272
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Preparation and Anticorrosion Performance of M-phenylenediamine-graphene Oxide/Organic Coating
LUAN Hao1, MENG Fandi1(), LIU Li1(), CUI Yu2, LIU Rui3, ZHENG Hongpeng1, WANG Fuhui1
1.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Abstract  

In order to solve the problems of poor dispersion of graphene oxide (GO) in organic coatings and poor compatibility with resins, m-phenylenediamine, taking as the so called "bridge" material, was grafted on the surface of graphene oxide (GO) via a chemical means to obtain M-GO composite materials. Then the M-GO/epoxy resin E-44 composite anticorrosion coatings were also prepared. The results of FTIR, Raman and TGA showed that amine groups of m-phenylenediamine were successfully bonded with the epoxy group. A few layers of the M-GO composite particulates of lamellar morphology can be observed by transmission electron microscope (TEM), indicating that the dispersibility of GO was improved through m-phenylenediamine-grafting. On the other hand, the cross-sectional morphology of the coating showed that the M-GO composite material also has good compatibility with epoxy resin. In comparison with the epoxy resin coating GO/EP with the inherent graphene oxide GO, the M-GO/EP coating shows far more better anti-corrosion performance, namely, after 1000 h of immersion in 3.5% (mass fraction) NaCl solution, the impedance modulus (|Z|0.01 Hz) value of EP/M-GO stayed at 1.0×109 Ω·cm2, and after salt spray test for 12 d, the M-GO/EP coating could still provide effective protection for the metal substrate. The results show that the m-phenylenediamine modified graphene oxide/organic coatings present significantly enhanced anti-corrosion performance.

Key words:  graphene oxide      organic coating      anti-corrosion performance     
Received:  24 December 2020     
ZTFLH:  TQ323.5  
Fund: National Natural Science Foundation of China(51901040);China Postdoctoral Science Foundation;Liao Ning Revitalization Talents Program(XLYC1807076)
Corresponding Authors:  MENG Fandi,LIU Li     E-mail:  fandimeng@mail.neu.edu.cn;liuli@mail.neu.edu.cn
About author:  LIU Li, E-mail: liuli@mail.neu.edu.cn
MENG Fandi, E-mail: fandimeng@mail.neu.edu.cn

Cite this article: 

LUAN Hao, MENG Fandi, LIU Li, CUI Yu, LIU Rui, ZHENG Hongpeng, WANG Fuhui. Preparation and Anticorrosion Performance of M-phenylenediamine-graphene Oxide/Organic Coating. Journal of Chinese Society for Corrosion and protection, 2021, 41(2): 161-168.

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2020.272     OR     https://www.jcscp.org/EN/Y2021/V41/I2/161

Fig.1  Schematic diagram of the surface modification of GO by m-phenylenediamine
Fig.2  FT-IR spectra of GO and M-GO
Fig.3  TGA curves of GO and M-GO
Fig.4  Raman spectra of GO and M-GO
Fig.5  Photos showing the contact angles of water drops on GO (a) and M-GO (b)
Fig.6  Visual illustrations of GO (a) and M-GO (b) dispersed in epoxy resin for different time
Fig.7  TEM images of GO (a) and M-GO (b)
Fig.8  SEM images of cross-sectional microstructures of EP/GO (a) and EP/M-GO (b) coatings
Fig.9  Water absorption curves of EP/GO and EP/M-GO coatings
Fig.10  Nyquist (a~d) and Bode (e, f) plots of EP/GO (a, b, e) and EP/M-GO (c, d, f) coatings after immersion in 3.5%NaCl solution for different time
Fig.11  Equivalent electrical circuits of EIS of EP/GO and EP/M-GO coatings: (a) the first stage (0~2 h), (b) the second starge (100~1000 h)
Fig.12  Variations of coating resistance Rc of two coatings with immersion time
Fig.13  Stress-strain curves of EP/GO and EP/M-GO coatings
Fig.14  Visual performances of EP/GO (a) and EP/M-GO (b) coatings on steel substrates to salt spray test for different time
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