Inhibiting effects of some oxadiazole derivatives on the corrosion of mild steel in perchloric acid solution |
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Authors: | Mounim Lebrini Hervé Vezin |
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Institution: | a Laboratoire de Cristallochimie et Physicochimie du Solide UMR 8012 ENSCL, BP. 108, F-59652 Villeneuve d’Ascq Cedex, France b Laboratoire de Chimie de Coordination et d’Analytique, Université Chouaib Doukkali, Faculté des Sciences, B.P. 20, El Jadida, Morocco c Laboratoire de Chimie Organique et Macromoléculaire, CNRS UMR 8009, USTL Bât C4, F-59655 Villeneuve d’Ascq Cedex, France |
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Abstract: | The efficiency of 3,5-bis(n-pyridyl)-1,3,4-oxadiazole (n-POX, n = 1, 2, 3), as corrosion inhibitors for mild steel in 1 M perchloric acid (HClO4) have been determined by weight loss measurements and electrochemical studies. The results show that these inhibitors revealed a good corrosion inhibition even at very low concentrations. Comparison of results among those obtained by the studied oxadiazoles shows that 3-POX was the best inhibitor. Polarisation curves indicate that n-pyridyl substituted-1,3,4-oxadiazoles are mixed type inhibitors in 1 M HClO4. The adsorption of these inhibitors follows a Langmuir isotherm model. The electronic properties of n-POX, obtained using the AM1 semi-empirical quantum chemical approach, were correlated with their experimental efficiencies using the linear resistance model (LR). |
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Keywords: | Corrosion inhibition Mild steel Oxadiazole Perchloric acid |
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