Effect of nano-Fe2O3/graphene oxide hybrids on the corrosion resistance of epoxy coating under alternating hydrostatic pressure
Jing Li, Fandi Meng, Li Liu, Yu Cui, Rui Liu, Hongpeng Zheng, Fuhui Wang
Abstract
2-aminoterephthalic acid (DATPA) was used as a binding agent for grafting nano-Fe2O3 onto the surface of graphene oxide (GO). Covalent bonding of this composite filler GOF was verified by SEM, XRD and FT-IR. The results indicated that the GOF fillers were dispersed well in the epoxy coating matrix. The compatibility between the filler and epoxy coating was enhanced, resulting in a good bonding of the filler and coating matrix. EIS results revealed that the |Z|0.01Hz values of GOF/EP coating kept at 107 Ω cm2 after 7 cycles under alternating hydrostatic pressure (AHP) condition, which is higher than that of GO/EP coating (2.38 × 106 Ω cm2). Well bonded GOF/epoxy resin interface is the reason for resisting the “push-pull” damage of AHP.