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An inorganic route to decorate graphene oxide with nanosilica and investigate its effect on anti‐corrosion property of waterborne epoxy
Author(s) -
Song Bojun,
Shi Yuanchang,
Liu Qingdong
Publication year - 2020
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4770
Subject(s) - materials science , nanocomposite , dielectric spectroscopy , graphene , oxide , x ray photoelectron spectroscopy , epoxy , chemical engineering , scanning electron microscope , corrosion , fourier transform infrared spectroscopy , thermogravimetric analysis , dispersity , composite material , electrochemistry , nanotechnology , polymer chemistry , metallurgy , chemistry , electrode , engineering
This paper reported an inorganic route that uses potassium silicate, which is one type of alkali silicate as an inorganic modifier, taking advantage of its instability and water condensation to decorate graphene oxide (GO) with nano‐SiO 2 . The ingredients of prepared nanocomposites were characterized by Fourier‐transform infrared spectroscopy (FT‐IR) and X‐ray photoelectron spectroscopy (XPS), and the thermodynamic property was tested by thermal gravimetric analysis (TGA). Scanning electron microscopy (SEM) was used to observe the morphology of SiO 2 ‐GO nanocomposites. All the analyses above revealed the nano‐SiO 2 (<100 nm) was deposited on the surface of GO by chemical bonds. In the meantime, the dispersion test illustrated that nano‐SiO 2 played an important role in improving the dispersity of GO. The effect of SiO 2 ‐GO nanocomposites on barrier and corrosion protection performance of SiO 2 ‐GO nanocomposites was tested by immersion experiment and electrochemical impedance spectroscopy (EIS). The results indicated that GO was helped to block the corrosion of aggressive medium; moreover, SiO 2 ‐GO nanocomposites had the best anticorrosion performance and the slowest rate of corrosion because of its good dispersity with waterborne epoxy coatings.