Investigation of corrosion inhibition of 4-(4-nitrophenyl) thiazol-2-amine on the copper in HCl: experimental and theoretical studies
ISSN: 1708-5284
Article publication date: 27 May 2022
Issue publication date: 10 November 2023
Abstract
Purpose
This paper aims to investigate the corrosion inhibition ability of 4–(4-nitrophenyl) thiazol-2-amine (NPT) on the copper in 1 M HCl.
Design/methodology/approach
The corrosion inhibitory ability of NPT on the copper in 1 M HCl was studied by electrochemical impedance spectroscopy, scanning electron microscopy and atomic force microscopy. Theoretical calculations (molecular dynamics simulation, density functional theory and the nucleus independent chemical shift [NICS] as aromaticity indicator of the molecule) were also performed.
Findings
The corrosion inhibition efficacy of this compound was about 80%. Nyquist plots display a small arc contributed to the film or oxide layer resistance and a large loop associated with charge transfer resistance. The inhibitor adsorption was under Langmuir’s adsorption model. ΔG0ads values point to the presence of physical and chemical adsorption. Results of quantum chemical calculations showed that NPT has better interaction with copper than NPTH+. NICS of NPT in benzene or thiazole rings was less negative compared to NICS of NPTH+. Thus NPT shows less aromaticity compared with NPTH+, showing NPT can have better interaction with copper than NPTH+. NPT had more negative Eint value and more interactions with the Cu relative to NPTH+, this result was in agreement with the results of quantum chemical calculations.
Originality/value
NPT is an efficient corrosion inhibitor for copper in HCl. Theoretical calculations showed that NPT can have better interaction with copper than NPTH+. The results of the theoretical studies were in good agreement with the experimental studies.
Keywords
Acknowledgements
The authors are grateful for the partial contribution of the Iranian University of Science and Technology to this study. The authors are greatly thankful to Dr Rezania et al. for their assistance.
Citation
Farahati, R., Ghaffarinejad, A. and Mousavi-Khoshdel, S.M. (2023), "Investigation of corrosion inhibition of 4-(4-nitrophenyl) thiazol-2-amine on the copper in HCl: experimental and theoretical studies", World Journal of Engineering, Vol. 20 No. 6, pp. 1128-1135. https://doi.org/10.1108/WJE-01-2022-0035
Publisher
:Emerald Publishing Limited
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