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Vol. 32 No. 4 (2020): Vol 32 Issue 4, 2020

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Experimental and Theoretical Study of Corrosion Behaviour of Maraging Steel in 1 M HCl in Presence of 5-Methyl-4-[(E)-(thiophen-2-ylmethylidene)amino]-4H-1,2,4-triazole-3-thiol

https://doi.org/10.14233/ajchem.2020.22466
R.N. Mary
Department of Chemistry, St. Aloysius College, Mangaluru-575003, India
R. Nazareth
Department of Chemistry, St. Aloysius College, Mangaluru-575003, India
P. Krishna Murthy
Department of Chemistry, Bapatla Engineering College (Autonomous), Bapatla-522102, India
https://orcid.org/0000-0002-5600-1489
P.A. Suchetan
Department of Studies and Research in Chemistry, University College of Science, Tumkur University, Tumkur-572103, India
https://orcid.org/0000-0002-0322-4160

Corresponding Author(s) : P.A. Suchetan

pasuchetan@gmail.com

Asian Journal of Chemistry, Vol. 32 No. 4 (2020): Vol 32 Issue 4, 2020

Abstract

The inhibitory action of a synthesized Schiff base (5-methyl-4-[(E)-(thiophen-2-ylmethylidene)amino]-4H-1,2,4-triazole-3-thiol) [MTATT] on the corrosion behaviour of maraging steel in 1 M HCl was investigated by electrochemical techniques like Tafel polarization studies and electrochemical impedance spectroscopy. According to experimental data, inhibition efficiency increased with increase in temperature and concentration of the inhibitor where MTATT acts as a mixed type inhibitor. The mode of inhibitor adsorption on maraging steel follows Langmuir adsorption isotherm. The calculated thermodynamic and activation parameters suggested chemisorption mode of inhibitor adsorption. Scanning electron microscope technology with energy dispersive X-ray spectroscopy (SEM-EDX) studies confirmed the adsorption of inhibitor molecule on the surface of maraging steel. Several global reactivity parameters were calculated using DFT method at B3LYP/6-311++(d,p) basis set. Theoretical calculations are in good concurrence with the experimental results.

Keywords

Maraging steel Schiff base Potentiodynamic polarization EIS Inhibition efficiency
Mary, R., Nazareth, R., Murthy, P. K., & Suchetan, P. (2020). Experimental and Theoretical Study of Corrosion Behaviour of Maraging Steel in 1 M HCl in Presence of 5-Methyl-4-[(E)-(thiophen-2-ylmethylidene)amino]-4H-1,2,4-triazole-3-thiol. Asian Journal of Chemistry, 32(4), 845–852. https://doi.org/10.14233/ajchem.2020.22466
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