Synergistic effect of iodide ions and bark resin of <i>Schinus molle</i> for the corrosion inhibition of API5L X70 pipeline steel in H<sub>2</sub>SO<sub>4</sub>
Mounir Djellab, Hamza Bentrah, Abdelouahad Chala, Hicham Taoui, Slimane Kherief, Bouzid Bouamra
Abstract
Abstract The synergistic effect of bark resin of Schinus molle (BRSM) and iodide ions in 0.5 M sulfuric acid has been studied for the first time by potentiodynamic polarization and electrochemical impedance spectroscopy measurements; also, the surface morphology has been analyzed by scanning electron microscopy–energy‐dispersive X‐ray spectroscopic analysis in the present work. The results show that the BRSM and iodide ions have an evident synergistic inhibition effect in a 0.5‐M sulfuric acid solution. The adsorption of the BRSM/iodide ion system follows the Langmuir adsorption isotherm and acts as a mixed‐type inhibitor in sulfuric acid. The BRSM/iodide ion system is an effective inhibitor for API5L X70 pipeline steel in the 0.5‐M sulfuric acid solution. The maximum percentage inhibition efficiency is equal to 99% at 1 g/L BRSM + 2 mM KI.