Synthesis and Anti-Corrosion Properties of PPy/α-Fe₂O₃ Composites

PPy/α-Fe₂O₃ composites with excellent corrosion resistance were successfully prepared by in-situ chemical oxidation polymerization. The phase and microstructure of the composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscpy (FTIR) and scanning electron microscopy (SEM). The effects of citric acid concentration on the morphology and structure of the composites were investigated. Epoxy resin coating was modified by the composite materials, and the corrosion protection performance of the composite coating was significantly improved, and the corrosion resistance was largely affected by the concentration of citric acid. When the concentration of citric acid was 0.5 mol/L, the self-corrosion potential of the modified coating was -0.685 9 V (SCE), and the corrosion current density was 3.08×10^-6 A/m². The AC impedance was the largest and the corrosion resistance was the best.