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Synergistic effect of iodide ions and bark resin of Schinus molle for the corrosion inhibition of API5L X70 pipeline steel in H2SO4 |
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| Authors: | Mounir Djellab Hamza Bentrah Abdelouahad Chala Hicham Taoui Slimane Kherief Bouzid Bouamra |
| Affiliation: | 1. Laboratory of Metallurgy, Department of Mechanical Engineering, Faculty of Science and Technology, Mohamed Khider University of Biskra, Biskra, Algeria;2. Laboratoire de Physique des Couches Minces et Applications, Mohamed Khider University of Biskra, Biskra, Algeria Department of Materials Science, Mohamed Khider University of Biskra, Biskra, Algeria;3. Laboratory of Metallurgy, Department of Mechanical Engineering, Faculty of Science and Technology, Mohamed Khider University of Biskra, Biskra, Algeria Laboratoire de Physique des Couches Minces et Applications, Mohamed Khider University of Biskra, Biskra, Algeria |
| 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. |
| Keywords: | bark resin of Schinus molle carbon steel corrosion inhibition eco-friendly inhibitor EIS iodide ion sulfuric acid synergistic effect |