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Synthesis and evaluation of bipyrazolic derivatives as inhibitors of corrosion of C38 steel in molar hydrochloric acid

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Abstract

Methyl 2-(bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)amino) acetate, BT36, and methyl 2-(bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)amino)-3-(1H-indol-3-yl)propanoate, BT 43, have been synthesized. Investigation by weight-loss measurement and use of electrochemical techniques revealed the compounds are very effective inhibitors of corrosion of C38 steel in 1 M HCl solutions—percentage protection exceeded 95 % for BT43 at concentrations as low as 10−2 M. An impedance study in the absence and presence of these compounds revealed the mechanism of protection was cathodic inhibition by polarization and charge-transfer. The Langmuir adsorption isotherm was obeyed. Quantum chemical data calculated by use of DFT at the B3LYP/6-31G* level of theory revealed a good correlation between inhibition efficiency and the molecular structure of BT36 and BT43. The highest occupied molecular orbital, the lowest unoccupied molecular orbital, the separation energy (ΔE), and the dipole moment (μ) from the inhibitor to the metal surface explain the experimental data well.

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Authors and Affiliations

  1. Laboratoire des Substances Naturelles et Bioactives (LASNABIO), BP 119, 13000, Tlemcen, Algeria

    N. Missoum, N. Boussalah & S. Ghalem

  2. Laboratoire d’Ingénierie des Matériaux, Modélisation et Environnement, Faculté des Sciences Dhar El Mahraz, Université Allal Ben Abdellah, BP 1796, 30000, Atlas, Fes, Morocco

    A. Guendouz & M. Taleb

  3. Laboratoire de Chimie Appliquée et Environnement, LCAE-URAC18, COSTE, Département de Chimie, Faculté des Sciences, Université Mohamed Premier, BP 524, 60000, Oujda, Morocco

    B. Hammouti, A. Chetouani & A. Aouniti

  4. Laboratoire de Chimie Physique, Centre Régionale des Métiers de l’Education et de Formation “CRMEF’’, de la Régionale Orientale, Meknes, Morocco

    A. Chetouani

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  1. N. Missoum
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Correspondence to A. Chetouani.

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Missoum, N., Guendouz, A., Boussalah, N. et al. Synthesis and evaluation of bipyrazolic derivatives as inhibitors of corrosion of C38 steel in molar hydrochloric acid. Res Chem Intermed 39, 3441–3461 (2013). https://doi.org/10.1007/s11164-012-0856-7

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