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Self-alignment of cationic graphene oxide nanosheets for anticorrosive reinforcement of epoxy coatings
Abstract
Abstract Designing coatings with long term anticorrosion performance remains a great challenge. Herein, a newfangled cationic dopamine-reduced graphene oxide (DRGO+) nanosheet is prepared as a filler for epoxy coating via simple dopamine oxidative self-polymerization and ionization reaction. DRGO+ can be dispersed stably in commercial water-based cathodic epoxy emulsion for more than 45 days without precipitation. Due to the presence of –NH3+ in DRGO+, it can be self-aligned parallel arrangement in the composite coating (DRGO+/EP coating) under the electric field. This highly parallel DRGO+ nanosheets tremendously improve the physical barrier effect of the coating and prolong the penetration path of the corrosive medium. Electrochemical impedance spectroscopy (EIS) test showed that the initial low-frequency impedance modulus of 0.5%-DRGO+/EP coating is as high as 4.79 × 1010 Ω cm2 when the content of DRGO+ is 0.5 wt%, which is an order of magnitude higher than that of pure epoxy coating (4.07 × 109 Ω cm2), exhibiting extraordinary corrosion resistance. Finally, the protective mechanism of composite coating is revealed by the identification of corrosion products and local-EIS techniques. In view of the validity of DRGO+, this work highlights the potential route for the large-scale preparation of coatings with superior long-term anti-corrosion.
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Cites
Wang, Z., Dong, Y., Li, H., Zhao, Z., Bin Wu, H., Hao, C., Liu, S., Qiu, J., & Lou, X. W. (2014) · Nature Communications · doi:10.1038/ncomms6002 · Cited by 1,059
Cited by
Zhu, X., Zhang, W., Lu, G., Zhao, H., & Wang, L. (2022) · ACS Nano · doi:10.1021/acsnano.2c06264 · Cited by 279
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Metadata
- Authors
- Zhu, X., Yan, Q., Cheng, L., Wu, H., Zhao, H., & Wang, L.
- Venue
- Chemical Engineering Journal
- Publisher
- Elsevier BV
- Published
- 2020-06
- Volume
- 389
- Pages
- 124435
- ISSN
- 1385-8947 (ISSN-L)
- OpenAlex
- W3005896582
- Cited by
- 204
- References
- 1
- FWCI
- 9.98
- Type
- journal article
- Language
- en
- Open access
- closed
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- Zhu, X., Yan, Q., Cheng, L., Wu, H., Zhao, H., & Wang, L. (2020). Self-alignment of cationic graphene oxide nanosheets for anticorrosive reinforcement of epoxy coatings. Chemical Engineering Journal. https://doi.org/10.1016/j.cej.2020.124435
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