Abstract
In this study, the corrosion inhibition effect of Plagiochila porelloides (Torr. ex Nees) Lindenb. extract, a Marchantiophyta species, on mild steel in hydrochloric acid solution at 298 K was investigated for the first time by applying electrochemical impedance spectroscopy (EIS), linear polarization (LPR) and potentiodynamic polarization techniques. Experiments were performed by immersing mild steel electrodes in acidic solutions containing different concentrations of Plagiochila porelloides extract for 1 hour before each electrochemical measurement to equilibrate with the aggressive solution. Liverwort extract showed a strong inhibitory effect as a result of 1 hour electrochemical experiments, and as the extract concentration increased, the protective effect of mild steel in acidic solutions raised. In addition, the surface images of the electrodes in 1.0 M HCl solutions with and without liverwort extract after 1-hour exposure were examined by an optical microscope and it was shown that the metal surface in the inhibited extract solution had a smoother appearance compared to the uninhibited metal surface. Electrochemical findings and surface images support each other.
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