The inhibitive action of Pistacia lentiscus as a potential green corrosion inhibitor for mild steel in acidic medium

The aim of present work is to test the effect of the extract (PLE) and the essential oil (PLO) of Pistacia lentiscus as a potential green corrosion inhibitors for acidic media using weight loss measurements and electrochemical techniques (potentiodynamic polarization curves, and electrochemical impedance spectroscopy) in the presence of different concentrations of PLE & PLO ranging from 0.25 to 2 g/L. The inhibition efficiency was found to increase with increasing inhibitor concentration up to maximum 81.2 % and 92.1 % for PLO and PLE at 2g/L, respectively. Potentiodynamic polarization showed that PLE and PLO act as mixed type inhibitors. Nyquist plots show that the efficiency of inhibition increases with increasing concentration of PL and the increased charge transfer resistance. Adsorption of PLO and PLE on the steel surface followed a Langmuir’s isotherm and the thermodynamic parameters were determined and discussed.