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Synthesis, characterisation and corrosion inhibition screening on 2-chloroacetophenone 4-ethyl-3-thiosemicarbazone: morphology, weight loss and DFT studies

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Abstract

Mild steel is often used as a construction material in the industry because of its relatively low price. However, due to its low corrosion resistance, some form of a protective film should be applied to prevent it from rusting in the corrosive environment. Thiosemicarbazone is one of the Schiff base ligands that can inhibit corrosion due to the presence of electronegative atoms such as N, S, and π electrons that can cause an efficient adsorption on the mild steel surface. This research aims to synthesise of 2-chloroacetophenone 4-ethyl-3-thiosemicarbazone (2ClAcTSC) and the structure was confirmed using an elemental analyser, UV–Vis, NMR and ATR-FTIR. The inhibitive effects of 2ClAcTSC were studied on mild steel in 1 M HCl and H2SO4 by using the weight loss method and Scanning Electron Microscopy (SEM). It was found that the 2ClAcTSC has better effectiveness in HCl rather than H2SO4 solution. Moreover, the inhibition efficiency increases as the inhibitor concentration increases. The SEM results verified that the inhibitor had been adsorbed on the mild steel surface to form a protective layer. Density Functional Theory (DFT) computations are performed to correlate inhibitor efficiency with intrinsic molecular parameters. The study revealed that the results obtained are consistent with the experimental data reported.

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Acknowledgements

The authors would like to express their gratitude to the Faculty of Applied Sciences, Universiti Teknologi MARA, Negeri Sembilan Branch, Kuala Pilah Campus, Negeri Sembilan, Malaysia for providing the research facilities, and UTM for the computational facility.

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Correspondence to Nur Nadia Dzulkifli.

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Razali, N.Z.K., Sheikh Mohd Ghazali, S.A.I., Sharif, I. et al. Synthesis, characterisation and corrosion inhibition screening on 2-chloroacetophenone 4-ethyl-3-thiosemicarbazone: morphology, weight loss and DFT studies. Chem. Pap. 76, 5955–5966 (2022). https://doi.org/10.1007/s11696-022-02297-8

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