Tuning F-doped degree of rGO: Restraining corrosion-promotion activity of EP/rGO nanocomposite coating

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（9）
• 页码范围: 121-132
• 页数: 12页
• 语种: 英文

摘要

Given that graphene features high electrical conductivity,it is a kind of material with corrosion-promotion activity.This study aimed to inhibit the corrosion-promotion activity of graphene in coatings.Here,we report an exciting application of epoxy matrix (EP)/F-doped reduced graphene oxide (rGO) coatings for the long-term corrosion protection of steel.The synthesized F-doped rGO (FG) did not reduce the utilization of rGO by a wide margin and possessed distinctive electrically insulating nature.The electrical conductivity of rGO was approximately 1500 S/m,whereas those of FG-1,FG-2 and FG-3 were 1.17,5.217 × 10-2 and 3.643 × 10-11 S/m,respectively.FG and rGO were then dispersed into epoxy coatings.The chemical structures of rGO and FG were investigated by transmission electron microscopy (TEM),scanning probe microscopy (SPM),X-ray photoelectron spectroscopy (XPS),Fourier-transform infrared spectroscopy (FT-IR),and X-ray diffraction (XRD).EP/FG coatings exhibited outstanding corrosion protection in comparison with blank EP and EP/rGO coatings mainly because the corrosion-promotion effect of rGO was eliminated.The anticorrosion ability of EP/FG coatings was improved with increased F-doped degree ofF& In addition,electrochemical impendance spectroscopy (EIS) results indicated that the Rc values of EP/FG-2 and EP/FG-3 were four orders of magnitude higher than those of EP/rGO in diluent NaCl solution (3.5wt.％) after immersion for 90 days.