Abstract
Utilization of an inexpensive photocatalyst replacing the active metal in the traditional sacrificial anode protection method is not only low in energy consumption but also clean and friendly to the environment. In this work, a composite epoxy (EP) coating with the addition of oxygen-doped g-C3N4 (OCNNS) was prepared for improving the corrosion resistance of Q235 carbon blocks. A series of characterizations verified that the synthesized OCCNS nanosheets exhibit high specific surface area and better water dispersibility. In addition, the corrosion resistance of coated samples was investigated by open-circuit potentials (OCP), electrical polarization curves and electrochemical impedance spectra (EIS), and the results showed that the optimal corrosion resistance was achieved with the addition of OCNNS-2 photocatalyst/coating with a maximum impedance radius about 6000 kΩ cm−2. Finally, the photocatalytic anticorrosion mechanism of OCNNS photocatalyst/coating was proposed and discussed.
Published Version
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