Experimental and theoretical studies of a novel synthesized azopyrazole-benzenesulfonamide derivative as an efficient co
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ORIGINAL PAPER
Experimental and theoretical studies of a novel synthesized azopyrazole‑benzenesulfonamide derivative as an efficient corrosion inhibitor for mild steel M. A. Mostfa1 · H. Gomaa1 · Ismail M. M. Othman1 · Gomaa A. M. Ali1 Received: 11 September 2020 / Accepted: 15 October 2020 © Iranian Chemical Society 2020
Abstract Herein, a novel inhibitor for the mild steel corrosion in an acidic environment based on azopyrazole-benzenesulfonamide derivative, namely 4-(2-(3-methyl-5-oxo-1-tosyl-1H-pyrazol-4(5H)-ylidene) hydrazinyl)-N-(pyrimidin-2-yl) benzenesulfonamide, is investigated. The electrochemical tests were performed using open-circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy. Furthermore, the corrosion inhibition mechanism is explained using Tafel polarization and Langmuir isotherm. The obtained findings revealed that corrosion resistance effectiveness increased as the resistant concentration grows. Moreover, Tafel polarization diagrams indicated that the compound used is a mixed-form inhibitor. The chemically quantum factors have been determined using the density functional hypothesis. A good correlation between the experimental findings and theoretical predictions is found from all the results of this study. In addition, the proposed corrosion inhibitor can be used for a wide range of industrial applications due to the high inhibition efficiency.
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13
Vol.:(0123456789)
Journal of the Iranian Chemical Society
Keywords Corrosion inhibitor · Organic inhibitor · Mild steel · Azopyrazole-benzenesulfonamide · Density functional theory
Introduction Corrosion is the damaging effect of metals through chemical or electrochemical reactions with their surrounding environment [1, 2]. Spontaneous dissolution of mild steel in acidic environments presents a dilemma in using steel in storing-containers and oil refineries, and other industrial applications. That is because the acid solutions are commonly employed to get rid of the unwanted scale and rust in many industrial processes [3, 4]. Industrial processes operating in an acidic medium are most vulnerable to metal loss by corrosion, resulting in a substantial economic loss and restraining technological progress [5–7]. Some organic inhibitors are either toxic or have an environmental concern [8–10]. On the other hand, nontoxic inhibitors are promising candidates for corrosion protection. Azopyrazole-benzenesulfonamide derivative has biological properties, including antitumor activity, highly effective antimicrobial, and antitubercular [11–13]. Pyrazole derivatives are among the most heterocyclic compounds that work by adsorption on metal-surface through nitrogen atoms, other than by triple or consecutive double-bonds or aromatic rings in their chemical structures. Various heterocyclic materials were used for the corrosion inhibition of mild steel in acidic media, such as pyrrole, imidazoline, pyridine, triazole, and pyrimidine [14–17]. Experim
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