Corrosion Inhibition of Copper by Olive Leaves Extract as Environmentally Friendly Inhibitors in Acidic Media

Abstract

An inhibition effect of olive leaves extract in corrosion of copper alloy in hydrochloric acid solution was studied by means of potentiodynamic polarization and scanning electron microscopy (SEM). The inhibition efficiency has as inhibitor concentration increased but decreased with increase in temperature. Fallouts have depicted that the inhibition takes place throughout adsorbing inhibitor molecules on the metal surface that agrees with Langmuir adsorption isotherm. Several thermodynamic parameters 14∆Gads." style="width: 41.25pt; height: 15pt;"> in addition to activation energy 14Ea" style="width: 22.5pt; height: 15pt;"> have been determined to explain the process of corrosion inhibition. The measurements of polarization indicated that olive leaves extract is of cathodic type. The surface characteristic of the inhibited and uninhibited metal tasters have examined by SEM.       

Keywords: Corrosion inhibition, copper, olive leaves extract, Adsorption Mechanism thermodynamic parameters.