Journal
APPLIED SURFACE SCIENCE
Volume 479, Issue -, Pages 963-973Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.02.193
Keywords
Graphene oxide; Polyethyleneimine; Waterborne epoxy; Corrosion resistance; SVET
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Funding
- National Natural Science Foundation of China [51775540]
- Zhejiang Province Key Technology Project [2015C01006]
- Youth Innovation Promotion Association, CAS [2017338]
- Open Financial Great from Qingdao National Laboratory for Marine Science and Technology [QNLM2016ORP0409]
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In this work, a polyethyleneimine-grafted graphene oxide (PEI-GO) hybrid material was prepared as an effective filler to improve the anticorrosion performance of waterborne epoxy coating. The successful covalent reaction between PEI and GO was confirmed by FTIR, Raman, XPS, XRD and TGA measurement. The epoxy coating filled with modified and unmodified graphene oxide was characterized by SEM and Raman spectroscopy. The results showed that PEI-GO was uniformly dispersed in the epoxy matrix. It was found that the PEI-GO hybrid materials displayed considerable superiorities in improving corrosion resistance of epoxy coating by EIS and SVET. Besides, the optimal content (0.25 wt%) of PEI-GO was obtained through experimental results. Moreover, the desirable anticorrosive property of PEI-GO/EP composite coating is proposed to be mainly attributed to the role of PEI, which fully stimulated the barrier properties of graphene oxide by improving its dispersion in the epoxy coating and also enhanced the crosslink density of epoxy resin by increasing the surface activity of the graphene oxide to the epoxy groups.
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