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Synergistic effect of AM-4VP-9 copolymer and iodide ion on corrosion inhibition of mild steel in 1 M H2SO4 |
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| Authors: | A Mansri B Bouras B Hammouti I Warad A Chetouani |
| Institution: | 1. Laboratoire d’Application des Electrolytes et des Polyélectrolytes Organiques (LAEPO), Département de Chimie, Université de Tlemcen, B.P. 119, 13000, Tlemcen, Algeria 2. LCAE-URAC18, Faculté des Sciences, Université Mohammed Premier, Oujda, Morocco 3. Department of Chemistry, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia 4. Laboratoire de chimie physique, Centre Pédagogique Régional des Professions de l’Education et de Formation “CRPEF”, Académie Régionale de l’Orientale, Oujda, Morocco |
| Abstract: | The effect of iodide ions on the corrosion inhibition of mild steel in 1 M sulfuric acid in the presence of poly(acrylamide-co-4-vinylpyridine) copolymer abbreviated by (AM-4VP-9) was studied by weight loss measurements and electrochemical techniques (impedance spectroscopy and polarisation curves) at 18 °C. The results obtained showed that the inhibition efficiency increased with increasing copolymer concentration. It was also found that the inhibition efficiency increased with the addition of potassium iodide (KI) to the copolymer. A synergistic effect was observed between the AM-4VP-9 copolymer and KI. On the other hand, it was found that the inhibiting effect of the system (AM-4VP-9 + KI) increased with increasing immersion time. Polarisation curves indicate that (AM-4VP-9) copolymer act as mixed inhibitors. EIS measurements show an increase of the transfer resistance with the inhibitor concentration. |
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