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Preparation and Anti-Corrosive Properties of Waterborne Epoxy Composite Coating Containing Graphene Oxide Grafted with Sodium Tripolyphosphate

by Na Wang 1,2,3,*, Xu Yin 1, Jing Zhang 1, Huiying Gao 1, Xinlin Diao 1 and Hongrui Yao 1,*
1
Sino-Spanish Advanced Materials Institute, Shenyang University of Chemical Technology, Shenyang 110142, China
2
Liaoning Provincial Key Laboratory of Rubber & Elastomer, Shenyang 110142, China
3
Key Laboratory on Resources Chemicals and Material of Ministry of Education, Shenyang University Chemical Technology, Shenyang 110142, China
*
Authors to whom correspondence should be addressed.
Coatings 2020, 10(4), 307; https://doi.org/10.3390/coatings10040307
Received: 21 February 2020 / Revised: 18 March 2020 / Accepted: 20 March 2020 / Published: 25 March 2020
(This article belongs to the Section Corrosion, Wear and Erosion)
In this paper, graphene oxide (GO) was grafted with sodium tripolyphosphate (STP) to achieve a new anti-corrosive pigment (STG) with homogenous dispersion in waterborne epoxy (EP). The results obtained from Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and X-ray Diffraction (XRD) revealed that STP was successfully combined with GO by chemical bonding. The corrosion resistance of EP, GO/EP and STG/EP coatings on carbon steel substrates was investigated via electrochemical impedance spectroscopy (EIS) and salt spray test. The EIS results showed that the impedance value of coating with 0.7 wt.% STG reached 1.019 × 109 Ω∙cm2, which was considerably higher than that of neat waterborne EP coatings. Salt spray test results revealed once again that STG (0.7 wt.%)/EP coating had superior corrosion resistance. Besides, the STG (0.7 wt.%)/EP coated sample showed the highest adhesion strength between coating and substrate. View Full-Text
Keywords: waterborne epoxy; graphene oxide; corrosion; tripolyphosphate; coating waterborne epoxy; graphene oxide; corrosion; tripolyphosphate; coating
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MDPI and ACS Style

Wang, N.; Yin, X.; Zhang, J.; Gao, H.; Diao, X.; Yao, H. Preparation and Anti-Corrosive Properties of Waterborne Epoxy Composite Coating Containing Graphene Oxide Grafted with Sodium Tripolyphosphate. Coatings 2020, 10, 307.

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