TWO DIPODAL PYRIDIN-PYRAZOL DERIVATIVES AS EFFICIENT INHIBITORS OF MILD STEEL CORROSION IN HCL SOLUTION — PART I: ELECTROCHEMICAL STUDY

M. B. Cisse, B. Zerga, F. El Kalai, M. Ebn Touhami, M. Sfaira, M. Taleb, B. Hammouti (), N. Benchat, S. El Kadiri and A. Touimi Benjelloun
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M. B. Cisse: Laboratoire d'Electrochimie, Corrosion et Environnement, Faculté des Sciences, Université Ibn Tofail BP 133, 14000 Kénitra, Morocco
B. Zerga: Laboratoire d'Ingénierie des Matériaux, Modélisation et Environment, Faculté des Sciences Dhar El Mahraz, Université Allal Ben Abdellah, BP 1796, 30000 Atlas, Fès, Morocco
F. El Kalai: LCAE-URAC18, Faculté des Sciences, Université Mohammed Premier BP 717, Oujda, Morocco
M. Ebn Touhami: Laboratoire d'Electrochimie, Corrosion et Environnement, Faculté des Sciences, Université Ibn Tofail BP 133, 14000 Kénitra, Morocco
M. Sfaira: Laboratoire d'Ingénierie des Matériaux, Modélisation et Environment, Faculté des Sciences Dhar El Mahraz, Université Allal Ben Abdellah, BP 1796, 30000 Atlas, Fès, Morocco
M. Taleb: Laboratoire d'Ingénierie des Matériaux, Modélisation et Environment, Faculté des Sciences Dhar El Mahraz, Université Allal Ben Abdellah, BP 1796, 30000 Atlas, Fès, Morocco
B. Hammouti: LCAE-URAC18, Faculté des Sciences, Université Mohammed Premier BP 717, Oujda, Morocco
N. Benchat: LCAE-URAC18, Faculté des Sciences, Université Mohammed Premier BP 717, Oujda, Morocco
S. El Kadiri: LCAE-URAC18, Faculté des Sciences, Université Mohammed Premier BP 717, Oujda, Morocco
A. Touimi Benjelloun: Laboratoire d'Ingénierie des Matériaux, Modélisation et Environment, Faculté des Sciences Dhar El Mahraz, Université Allal Ben Abdellah, BP 1796, 30000 Atlas, Fès, Morocco

Surface Review and Letters (SRL), 2011, vol. 18, issue 06, 303-313

Abstract: The effect of two pyridin-pyrazol derivatives, N-[(3,5-dimethyl-1H-pyrazol)methyl]pyridine-2-amine (TB5) and 5-bromo-N-[(3,5-dimethyl-1H-pyrazol)methyl]pyridine-2-amine (TB6), newly synthesized, on the corrosion of mild steel in 1.0 M HCl was investigated by weight-loss and various electrochemical techniques. Results obtained reveal that these pyridin-pyrazol derivatives perform excellently as corrosion inhibitors for mild steel in hydrochloric solution. Polarization curves showed that both TB5 and TB6 are mixed-type inhibitors in acidic medium. A kinetic study of steel in uninhibited and inhibited acid for TB6 was also achieved to provide suitable investigations on corrosion inhibition mechanism in 1.0 M HCl solution. The effect of concentration and temperature on the inhibiting efficiency has been examined. The thermodynamic parameters for both dissolution and adsorption processes were calculated and discussed for TB6. The adsorption of inhibitor TB6 on the mild steel surface obeys the Langmuir adsorption isotherm equation.

Keywords: Mild steel; corrosion inhibition; pyridin-pyrazol; 1 M HCl medium; adsorption (search for similar items in EconPapers)
Date: 2011
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DOI: 10.1142/S0218625X11014783

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