Coriandrum sativum leaves extract (CSL) as an eco-friendly green inhibitor for corrosion of carbon steel in acidic media

The inhibition efficiency of coriandrum sativum leaves extract (csl) have been studied as an eco-friendly green inhibitor for corrosion of carbon steel in 1 m hcl and 0.5 m h2so4 solutions using the potentiodynamic polarization,electrochemical impedance spectroscopy (eis),weight loss techniques and scanning electron microscopy analysis. the inhibition efficiency increased with the increase of the concentration of the extract and decreased with the increase in temperature. the results obtained showed that csl extract inhibited the corrosion process by a physical adsorption mechanism that followed the langmuir adsorption isotherm model. the adsorption thermodynamic parameters that were calculated include,free energy of adsorption (δg°ads),enthalpy of adsorption (δh°ads),and entropy of adsorption (δs°ads) revealed that the adsorption process are spontaneous and exothermic. all the results show that the csl extract can act as an inhibitor for the corrosion of carbon steel in the acidic medium.