Incorporation of silica network and modified graphene oxide into epoxy resin for improving thermal and anticorrosion properties

Abstract

In this study, the silica network and functionalized graphene oxide (GO) were incorporated into the epoxy coating systems, which was aimed to improve the thermal property and corrosion resistance of epoxy coatings. First, tetraethyl orthosilicate (TEOS) oligomers and epoxy hybrid was fabricated through sol–gel method. Then the (3‐aminopropyl) triethoxysilane (APTES) modified graphene oxide (FGO) was added into the epoxy hybrid composite to obtain anticorrosion coatings. Fourier transform infrared spectroscopy, thermogravimetric analysis (TGA), Raman spectrum, and X‐ray photoelectron spectrum were conducted to evaluate the structural information of GO and APTES modified GO nanosheets. The results indicated that the APTES successfully grafted onto the surface of GO sheets. Besides, TGA curves, electrochemical measurements and salt spray test were also carried out to characterize the thermal performance and corrosion resistance of GO based epoxy coatings. The TGA results revealed that the thermal performance of epoxy coating containing silica network and FGO nanofiller (ES/FGO) was significantly strengthened compared to pure epoxy. The initial degradation temperature of epoxy coating was increased from 300 to 343.7°C after incorporation of silica component and FGO. The EIS measurements demonstrated that the impedance modulus of ES/FGO was significantly higher than neat epoxy, which indicated that the corrosion resistance of epoxy was substantially strengthened after introduction of silica component and FGO. The corrosion rate and inhibition efficiency of epoxy composite coatings were also shifted from 1.237 × 10−7 mm/year and 76.6% (for neat epoxy) to 1.870 × 10−9 mm/year and 99.6% (for ES/FGO), respectively. The salt spray test also revealed that the silica and FGO can improve the corrosion resistance of epoxy coating. Additionally, the dispersion of GO sheets was also enhanced after the modification of APTES siloxane.

Constructing Fe2O3 particles uniformly grown on graphene oxide as additives for ethylene vinyl acetate copolymer thermal stability, thermal conductivity and anti‐static performance enhancement

“…[24] Especially, the peak at 285.4 eV could be C-N bonds which confirmed the chemical reaction between GO and amino groups. [25] It is notice that, two peaks at 401.4 eV and 399.4 eV from N 1 s peak was associated the amino-functional groups on Fe 2 O 3 surface which could react with carboxyl functional groups on GO surface by forming -CO-NH-bonds. [26] As shown in Fe 2p spectrum (Figure S1), the XPS peaks at 711.1 eV and 724.6 eV could be Fe 2p 3/2 and Fe 2p 1/2 .…”

The impact of CaTiO 3 -Ca 2 SiO 4 nanoparticles on the mechanical properties of an epoxy/polyvinyl acetate nanocomposite reinforced with carbon fibers

“…and CaSiO3 [12] has a remarkable effect on the improvement of modulus, mechanical properties, wear resistance, the tensile and flexural strength, crack propagation energy, oxidation, and anticorrosion properties of epoxy resin.…”

Research on the Preparation and Anticorrosion Properties of EP/CeO2-GO Nanocomposite Coating

“…Surface coating is the most widely used protection method, among which epoxy coating is most commonly used for metal surface protection. Epoxy coating has excellent corrosion resistance, good mechanical strength and strong bonding performance of base material [ 5 , 6 , 7 ]. However, its long-term corrosion resistant performance is not outstanding and requires more effort [ 8 ].…”