Synergistic effect of hybrid graphene oxide-aluminum dihydric tripolyphosphate in epoxy-based anticorrosive coatings

Abstract

ADTP-GO hybrid was prepared from multi-layered aluminum dihydric tripolyphosphate (ADTP) and flake-shaped graphene oxide (GO) by a coupling method using (3-aminopropyl) triethoxysilane (ASi) as the coupling agent. Characterization analyses of the hybrid were performed by FT-IR, XRD and SEM. The effect of incorporating 2wt% ADTP-GO hybrid on corrosion inhibition performance of epoxy coating was evaluated in 3.5wt.% NaCl aqueous solution by using Tafel and electrochemical impedance spectroscopy (EIS) analysis. For comparison, the effects of ADTP and GO, alone and in combination without coupling treatment were also evaluated. FT-IR and XRD showed the presence of the chemical interaction between ADTP and GO in ADTP-GO hybrid. SEM indicated that GO was spread on the surface of ADTP layers in the hybrid. Tafel and EIS data indicated that the hybrid displayed an anti-corrosion performance superior to ADTP/GO blend without coupling treatment. The superiority was attributed to the stronger synergetic effect of ADTP and GO in ADTP-GO hybrid than in ADTP/GO blend. Additionally, epoxy/ADTP/GO coating was better than pure epoxy, epoxy/ADTP, and epoxy/GO coatings in the anti-corrosion performance on mild steel. It seems that the combination of ADTP and GO produced synergistic effect, and the synergistic effect was more obvious after chemical coupling.

Review and Future Prospects of Properties and Applications of Graphene based Anti corrosion Composite Materials

“…The sediment was then dried at 60 ° C for 24 hours. The ground powder is used as an ADTP/GO blend [5]. Graphene oxide has excellent electrical conductivity and mechanical properties, while aluminum tripolyphosphate has excellent corrosion resistance and high temperature resistance, and the combination of the two can play a synergistic effect to improve the overall performance of the material.…”