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Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings

In order to improve the corrosion resistance of zinc-rich epoxy coatings and reduce the amount of zinc used, first, graphene oxide (GO) was modified by sulfonated multiwall carbon nanotubes (SMWCNTs) to obtain the modified graphene oxide (SM-GO). The samples were characterized by Fourier transform i...

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Autores principales: Tian, Yong, Bi, Zhenxiao, Cui, Gan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8160921/
https://www.ncbi.nlm.nih.gov/pubmed/34069742
http://dx.doi.org/10.3390/polym13101657
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author Tian, Yong
Bi, Zhenxiao
Cui, Gan
author_facet Tian, Yong
Bi, Zhenxiao
Cui, Gan
author_sort Tian, Yong
collection PubMed
description In order to improve the corrosion resistance of zinc-rich epoxy coatings and reduce the amount of zinc used, first, graphene oxide (GO) was modified by sulfonated multiwall carbon nanotubes (SMWCNTs) to obtain the modified graphene oxide (SM-GO). The samples were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and Raman spectroscopy. Then, four kinds of coatings were prepared, namely pure zinc-rich coating (0-ZRC), graphene oxide-based zinc-rich coating (GO-ZRC), sulfonated multiwall carbon nanotube-based zinc-rich coating (SM-ZRC) and SM-GO-based zinc-rich coating (SG-ZRC). The corrosion resistance of the above coatings was studied by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), a salt spray test, 3D confocal microscope, and electron scanning electron microscope (SEM). The results indicate that GO is successfully non-covalently modified by SMWCNTs, of which the interlayer spacing increases and dispersion is improved. The order of the corrosion resistance is GO-ZRC > SG-ZRC > SM-ZRC > 0-ZRC. The addition of GO, SMWCNTs, and SM-GO increases the shielding effect and increases the electrical connection between Zn particles and metal substrates, which improves the corrosion resistance. However, SMWCNTs and SM-GO also strengthen the galvanic corrosion, which decreases the corrosion resistance to some extent.
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spelling pubmed-81609212021-05-29 Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings Tian, Yong Bi, Zhenxiao Cui, Gan Polymers (Basel) Article In order to improve the corrosion resistance of zinc-rich epoxy coatings and reduce the amount of zinc used, first, graphene oxide (GO) was modified by sulfonated multiwall carbon nanotubes (SMWCNTs) to obtain the modified graphene oxide (SM-GO). The samples were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and Raman spectroscopy. Then, four kinds of coatings were prepared, namely pure zinc-rich coating (0-ZRC), graphene oxide-based zinc-rich coating (GO-ZRC), sulfonated multiwall carbon nanotube-based zinc-rich coating (SM-ZRC) and SM-GO-based zinc-rich coating (SG-ZRC). The corrosion resistance of the above coatings was studied by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), a salt spray test, 3D confocal microscope, and electron scanning electron microscope (SEM). The results indicate that GO is successfully non-covalently modified by SMWCNTs, of which the interlayer spacing increases and dispersion is improved. The order of the corrosion resistance is GO-ZRC > SG-ZRC > SM-ZRC > 0-ZRC. The addition of GO, SMWCNTs, and SM-GO increases the shielding effect and increases the electrical connection between Zn particles and metal substrates, which improves the corrosion resistance. However, SMWCNTs and SM-GO also strengthen the galvanic corrosion, which decreases the corrosion resistance to some extent. MDPI 2021-05-19 /pmc/articles/PMC8160921/ /pubmed/34069742 http://dx.doi.org/10.3390/polym13101657 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Tian, Yong
Bi, Zhenxiao
Cui, Gan
Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings
title Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings
title_full Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings
title_fullStr Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings
title_full_unstemmed Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings
title_short Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings
title_sort study on the corrosion resistance of graphene oxide-based epoxy zinc-rich coatings
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8160921/
https://www.ncbi.nlm.nih.gov/pubmed/34069742
http://dx.doi.org/10.3390/polym13101657
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