Corrosion Inhibition of Oil Pipelines in Acidic Medium by Using Limon leaves Extract as an Environmentally Friendly Inhibitor

Abstract

Citrus Limon leaf ( ) extract was used to produce an environmentally friendly anti-corrosion inhibitor when exposed to mild steel in  at a  concentration. The effect of temperatures ( ) and inhibitor concentration was studied using a weight loss technique. The results obtained show that the inhibition efficiency increases with increasing extract concentration and increasing temperature. At higher inhibitor concentrations and temperatures, the inhibition effectiveness was increased to . The inhibitory effect was confirmed by the absorption of the components of the extract, which was determined by the Langmuir adsorption isotherms. The values of the adsorption free energy were less than , indicating physical adsorption. The adsorption thermodynamic parameters that were calculated supported the physical adsorption of  extract on a mild steel surface, as shown by the results. The inhibition was confirmed by testing the metal's surface morphology with  and .