石墨烯/环氧树脂复合涂层的γ射线辐照损伤及其腐蚀防护性能

用硅烷偶联剂对石墨烯表面进行修饰, 制备石墨烯/环氧树脂复合涂层。通过交流阻抗(EIS)和塔菲尔极化曲线(Tafel slope)等电化学方法分析复合涂层经伽马射线辐照后的腐蚀防护性能。采用电子自旋共振(ESR)和傅里叶红外光谱分析仪(FTIR)等测试复合涂层的γ射线辐照损伤, 探索了石墨烯在环氧树脂中抗辐照损伤的作用机理。Tafel结果显示复合涂层经280 kGy辐照后, 腐蚀电流为6.140×10^-9 A/cm², 而纯环氧树脂涂层的腐蚀电流则为1.340×10^-8 A/cm², 说明石墨烯可以使复合涂层保持较好的腐蚀防护性能。ESR分析表明, 复合涂层中的石墨烯可以降低环氧树脂基体在γ射线辐照过程中产生的过氧自由基, 表明石墨烯可有效吸收辐照过程中的自由基。辐照前后复合涂层的FT-IR图谱没有发生明显变化, 说明石墨烯有效降低了伽马射线对环氧树脂的结构损伤。因此, 可以认为石墨烯能够减缓环氧树脂在高能辐照环境中的老化, 从而延长其使用寿命。

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

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.