The Effect of Persimmon Leaves Extract as Corrosion Inhibitor of Carbon Steel in Hydrochloric Acid Media

Inhibition of the corrosion of carbon steel by persimmon leaves extract in HCl solution has been studied using weight loss measurement, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The effect of temperature on the corrosion inhibition effect of persimmon leaves extract was also studied by using potentiodynamic polarization method. The obtained results demonstrate that inhibition efficiency in both media increased with increasing concentration of the extract while inhibition efficiency decreases with increasing temperature. Potentiodynamic polarization curves revealed that persimmon leaves extract behaves as mixed-type inhibitor. At all temperatures, the adsorption of the extract components onto the steel surface was found to follow Langmuir adsorption isotherm. The morphology of the corroding steel surface in the absence and presence of persimmon leaves extract was visualized using scanning electron microscopy (SEM).