Abstract
The epoxy coating containing ZrO(2) nanoparticles modified with 3-aminopropyltriethoxysilane (APTES) was prepared by electrostatic spraying on the surface of Q235 mild steel. The effect of the concentration of APTES-modified ZrO(2) nanoparticles on the corrosion resistance of epoxy coating was characterized and tested by FTIR spectroscopy, scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). The results show that nano ZrO(2) was successfully modified by a silane coupling agent. By adding an appropriate amount of APTES to modify nano ZrO(2) in epoxy coating could significantly improve the corrosion resistance of the Q235 surface. When the mass fraction of nano ZrO(2) is 2%, the composite coating shows the highest impedance value of about 1.0 × 10(5) Ω cm(2) to achieve the best corrosion resistance.