3,6-Di(pyridin-2-yl) pyridazine derivatives as original and new corrosion inhibitors in support of mild steel: Experimental studies and DFT investigational

• M. Filali¹, E.M. El Hadrami¹, A. Ben-tama¹, B. Hafez², I. Abdel-Rahman², A. Harrach³, H. Elmsellem⁴, B. Hammouti⁴, M. Mokhtari⁵, SE. Stiriba⁶ and M. Julve⁶

¹ Laboratoire de Chimie Organique Appliquée, Université Sidi Mohamed Ben Abdellah, Faculté des Sciences et Techniques, Route d'Immouzer, BP 2202 Fès, Morocco
² Department of Chemistry, College of Sciences, University of Sharjah, PO Box: 27272, UAE
³ Laboratoire de Chimie de la matière condensée, Université Sidi Mohamed Ben Abdellah, Faculté des Sciences et Techniques, Route d'Immouzer, BP 2202 Fès, Morocco
⁴ Laboratoire de chimie analytique appliquée, matériaux et environnement (LC2AME), Faculté des Sciences, B.P. 717, 60000 Oujda, Morocco
⁵ University of Echahid Hamma Lakhdar, PO Box 789, El-Oued, Algeria
⁶ Instituto de Ciencia Molecular (ICMol), Université de Valencia

Abstract: Corrosion inhibition performance of three new synthesized novel compounds namely, 1-((3,6-di(pyridin-2-yl)pyrdazin-4-yl)methyl)-indoline-2,3-dione (FM1), 4-(morpholinomethyl)-3,6-di(pyridin-2-yl)pyridazine (FM2) and 3,6-di(pyridin-2-yl)-4-(p-tolyl)-pyridazine (FM3) on mild steel (MS) was investigated by HCl with 1 M concentration. The corrosion inhibition performance of the synthesized compounds was studied by weight lοss, impedance spectroscopy(EIS) and potentiodynamic polarization (PDP) methods. The results showed that tһe corrosion inhibition efficiency increases with the increase in the concentration of the compounds (FMs). The PDP measurements reveal that the type of these compounds is a mixed-type behavior. The results of impedance studies (EIS) showed that in the presence of FMs, the R_ct values increase while the C_dl values decrease due to the adsorption of inhibitors (FMs) on the mild steel surface. EIS study showed that there is one capacitance loop related to charge transfer mechanism. The adsorption of (FMs) on the mild steel surface obeys the Langmuir-adsorption isοtherm. The 1-((3,6-di(pyridin-2-yl)pyrdazin-4-yl)methyl)-indoline-2,3-dione (FM1) showed a better inhibition performance in comparison with the FM2 and FM3. The theoretical results which shows also a good correlation with the electrochemical experiments and weight loss measurements.

Keywords: 3,6-di(pyridin-2-yl)pyridazine, mild steel, corrosion inhibitor, quantum chemical calculations

Int. J. Corros. Scale Inhib., 2019, 8, no. 1, 93-109 PDF (1 223 K)
doi: 10.17675/2305-6894-2019-8-1-9

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