Abstract
The effect of free radicals generated by photocatalysis on the inhibition behaviour of Ce3+ was investigated. Inhibition behaviour of Ce3+ was evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy and the concentration of Ce3+ is detected by inductively coupled plasma-optical emission spectroscopy. Results confirmed that free radicals have no evident effect on the corrosion behaviour of carbon steel or zinc, but the corrosion inhibition efficiency of Ce3+ gradually decreases with the extension of ultraviolet (UV) irradiation time and increasing UV light intensity. Studies showed that the free radicals generated under photocatalysis gradually convert Ce3+ into Ce4+, which quickly form precipitation in the medium, thereby reducing the corrosion inhibition performance of Ce3+.
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