Graphene/Epoxy Composite Coating Damage under γ-ray Irradiation and Corrosion Protection

doi:10.15541/jim20170143

Abstract

Abstract:

Polymer networks like epoxy resin, as common protection materials, always experience radiolytic oxidation degradation under gamma irradiation environment. To avoid this, we report a scheme to synthesis EPTES modified graphene oxide, and incorporate it into the epoxy resin, followed by thermal polymerization, then obtain a graphene/epoxy composite coating. Electrochemical tests were performed to prove the influence of γ-ray on a anti-corrosion properties of the Graphene/epoxy composite coating. electron spin resonance (ESR) and Fourier Transform infrared spectroscopy (FT-IR) were used to evaluate the damage degree under the gamma irradiation, as well as to confirm its mechanism of graphene in the epoxy resin matrix during the irradiation. The result of Tafel slope showed that the corrosion current of GEP was 6.140×10^-9 A/cm², smaller than neat epoxy, indicating a better anticorrosion property of the graphene/epoxy composite coating after 280 kGy irradiation. This findings pointed that graphene possesses anti-corrosion property under 280 kGy irradiation. The electron spin resonance and FT-IR detection show that graphene act as radical scavenger, thus decrease damage from gamma irradiation, and slow down ageing process of the coating under the gamma irradiation.

Key words: EPTES, graphene, composite, γ-ray irradiation, anti-corrosion property, radical

CLC Number:

O646

XIA Wei, WANG Tao, SONG Li, GONG Hao, GUO Hu, FAN Xiao-Li, GAO Bin, ZHAO Jun, HE Jian-Ping. Graphene/Epoxy Composite Coating Damage under γ-ray Irradiation and Corrosion Protection[J]. Journal of Inorganic Materials, 2018, 33(1): 35-40.

Figures/Tables 7

Fig. 1 (a) Schematics of EPTES functionlized graphene oxide preparation, (b) SEM image of functionlized graphene oxide, (c) FT-IR spectra of GO and FGO, (d) The wide-angle X-ray diffraction (XRD) patterns of GO and FGO and (e) TEM image of FGO & Photographs of GO and FGO dispersion in epoxy matrix. All the photographs were taken 30 d after their preparation, left: unmodified GO; right: FGO modified by EPTES

Fig. 2 (a) Low and (b) high magnification TEM images of ultrathin section of GEP/0.25% FGO nanocomposite

Fig. 3 SEM images of the surface of neat epoxy (a) and FGO/ EP (b) without gamma irradiation, and the surface of EP(c) FGO/ EP(d) after 280 kGy gamma irradiation

Fig. 4 Nyquist plots (a) and potentiodynamic polarization curves (b) of neat epoxy, FGO/EP before (c) andafter (d) 280 kGy irradiated,with (e) equivalent circuits used for fitting from Nyquist plots

Table 1 Change of corrosion current density (icorr) and corrosion potentials (Ecorr) values before and after 280 kGy irradiation

Sample	E_corr/mV (vs.SCE)	i_corr/(A•cm²)
EP-0 kGy	-0.148	9.756×10^-10
FGO/EP-0 kGy	-0.124	2.415×10^-9
EP-280 kGy	0.003	1.340×10^-8
FGO/EP-280 kGy	0.187	6.140×10^-9

Fig. 5 X-band ESR spectra measured at RT of neat epoxy, FGO/EP samples after 280 kGy irradiation

Fig. 6 FT-IR spectra of EP, FGO/EP samples during radiation environment normalized after 280 kGy irradiation

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	Supplementary Materials