Journal
COATINGS
Volume 10, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/coatings10040307
Keywords
waterborne epoxy; graphene oxide; corrosion; tripolyphosphate; coating
Categories
Funding
- National Natural Science Foundation of China [51973124]
- National Key R&D Program Science and Technology Winter Olympics [2019YFF0302004]
- Sino-Spanish Advanced Materials Institute, Shenyang Municipal Science and Technology Bureau [18-005-6-04]
- Department of Science & Technology of Liaoning province-Shenyang National Laboratory for Materials Science Joint RD Fund Project [2019JH3/30100015]
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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 x 10(9) Omega.cm(2), 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.
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