Mild steel corrosion inhibition by Parsley (Petroselium Sativum) extract in acidic media

Abstract

The inhibition effect of Parsley (Petroselium Sativum) leaves extract (PSL) on mild steel in one molar HCl solution was investigated by weight loss, potentiodynamic polarization, impedance spectroscopy and scanning electron microscopy. Steel corrosion rate decreased significantly in the presence of PSL. The corrosion inhibition efficiency increased with the increase of PSL concentration up to 92.39% obtained at 25 °C for a 5 gL−1 concentration. Polarization showed that PSL acts as a mixed type inhibitor. The adsorption of the extract on mild steel surface was spontaneous, physisorption type and according to the Langmuir adsorption isotherm. Results obtained by different tests proved that the extract is an effective green inhibitor for mild steel corrosion in acid solution. Keywords: Corrosion, Mild steel, Parsley, Polarization, Impedance spectroscopy