Impact of Fe3O4-CNT Hybrid with Magnetic Field Control on Corrosion Resistance of Inorganic Phosphate Bonded Coating

Abstract

Fe3O4-CNT nanomaterials were used to enhance the corrosion performance of inorganic phosphate bonded coatings (IPBCs). Firstly, Fe3O4-CNT nanomaterials were prepared through hydrothermal method and characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that Fe3O4 nanoparticles relatively evenly distributed on the surface of CNT. Then, Fe3O4-CNT hybrids were added into IPBC as the reinforcing phase, IPBC, IPBC reinforced by Fe3O4-CNT hybrids (IPBC-CNT) and IPBC reinforced by Fe3O4-CNT hybrids with magnetic field control (IPBC-CNT-Mag) were prepared, respectively. And the corrosion performance of the three coatings were analyzed through open circuit potential, polarization curves and electrochemical impedance spectrum (EIS) experiments. Results shows the protection efficiency of neat IPBC, IPBC-CNT and IPBC-CNT-Mag is around 80.30, 94.98, 95.64%, indicating adding Fe3O4-CNT nanomaterials as a functional filler to the inorganic phosphate bonded coating can effectively enhance the corrosion resistance of the coating, while Fe3O4-CNT hybrids after magnetic field treatment can further improve the corrosion resistance of IPBCs. That is because with the introduction of magnetic field, Fe3O4-CNT hybrid can be better dispersed in IPBC, so that CNT can be better utilized and played, which resulting the excellent corrosion performance of IPBC-CNT-Mag.