An inorganic route to decorate graphene oxide with nanosilica and investigate its effect on anti‐corrosion property of waterborne epoxy

Abstract

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.

Difunctional Silicon Dioxide Combined with Graphene Oxide Nanocomposite to Enhance the Anticorrosion Performance of Epoxy Coatings

“…In addition, the weak peak at 1532 cm –1 was ascribed to the secondary amide N–H bending, and the N–H vibration peak could be observed at 814 cm –1 as well. Moreover, the C–N tensile peak and Si–O–C peak arose at 1456 and 1072 cm –1 , respectively. − These results vividly demonstrated that the GO was modified by GPTS and the nanocomposite SiO 2 -GO was prepared.…”

Application of Modified Graphene Oxide in Corrosion Protection

“…Compared with previous methods, this synthesis is relatively simple. [44] Besides the method of in-situ formation on the surface of graphene oxide, grafting nano-SiO 2 onto the surface of graphene oxide by silane coupling agent is also a common method. Pourhashem et al compared the effects of APTES and GPTMS on the performance of nanocomposite coatings.…”

“…The test results showed that SiO 2 ‐GO had good dispersion in epoxy resin coatings and enhanced the barrier properties of the coatings. Compared with previous methods, this synthesis is relatively simple [44] …”

Review of Recent Developments in the Formulation of Graphene-Based Coatings for the Corrosion Protection of Metals and Alloys

“…The interest in SiO 2 nanoparticles stems from their excellent chemical and thermal stability, hydrophilicity and low cost. A number of studies have shown that SiO 2 -modifed GO epoxy coatings have more protective properties than the corresponding GO/epoxy formulations with the nano-SiO 2 playing an important role in improving the dispersion of GO sheets [233,234]. When GO is modified with SiO 2 it becomes more hydrophilic and while this improves its dispersion within coatings, it can also reduce the protective nature of the coatings.…”