Experimental and Computational Investigation for (E)-2-hydroxy-5-(2-benzylidene) Aminobenzoic Acid Schiff Base as a Corr
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RESEARCH PAPER
Experimental and Computational Investigation for (E)-2-hydroxy-5-(2benzylidene) Aminobenzoic Acid Schiff Base as a Corrosion Inhibitor for Copper in Acidic Media Gu¨ray Kılınççeker1
•
Mahmut Bas¸1 • Farhad Zarifi1 • Koray Sayın2
Received: 3 July 2020 / Accepted: 22 October 2020 Ó Shiraz University 2020
Abstract The corrosion behavior of copper in 1 M HCl in the absence and presence of Hha ((E)-2-hydroxy-5-(2-benzylidene) aminobenzoic acid) has been investigated experimentally and computationally. In this way, the electrochemical behavior of copper was studied in 1 M HCl and 1 M HCl ? x M Hha solutions under different temperatures. Electrochemical techniques were used. In addition to the laboratory methods, computational chemistry was also used to confirm the corrosion protection ability of the inhibitor. In this way, relationship between Hha and copper ions was investigated by computational chemistry methods via B3LYP/6-31G(d) level in detail. The optimum concentration of the studied inhibitors showing the best corrosion inhibition at different temperatures. The inhibition efficiency increases with increase in concentration of Hha. Scanning electron microscopy observations of the copper surface confirmed the existence of an adsorbed film. Quantum calculations also were showed a good tendency for this inhibitor to metal ions. This study demonstrates that the application of Hha will significantly reduce the corrosion rate of copper. Keywords Corrosion inhibitor Molecular simulation Copper Schiff base
1 Introduction Due to the ease of use and abundance of copper and copper alloys, the widespread use of these metals in various industries and technologies is reported more and more every day. Of course, it is also important to note that this metal and its alloys are also economically feasible. However, they are vulnerable among building materials that are
& Gu¨ray Kılınc¸c¸eker [email protected] Mahmut Bas¸ [email protected] Farhad Zarifi [email protected] Koray Sayın [email protected] 1
Department of Chemistry, Faculty of Sciences and Letters, C¸ukurova University, Balcalı, 01330 Sarıc¸am, Adana, Turkey
2
Department of Chemistry, Faculty of Science, Cumhuriyet University, 58140 Sivas, Turkey
exposed to corrosion at high rates (Guenbour et al. 2000; Tu¨ken 2006). Anodically polarization is the most common part of corrosion studies of this metal, which has been studied in scientific articles. These studies have shown that in neutral or almost neutral pH conditions, highly protective copper oxides or hydroxides can form on the metal surface. But copper is vulnerable in environments that are relatively strong in acidity and undergoes corrosion reactions, although it is very resistant in neutral or slightly alkaline environments (Kilinc¸c¸eker, Galip 2008; Kosec et al. 2010; Kılınc¸c¸eker, Demir 2013; Tansug˘ et al. 2014; Li et al. 2018). The small amount of substances that added to a corrosive environment and slow or stop corrosi
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