Copyright (c) 2026 Dr Ashly Thomas Thomas, Dr Aparna E P, Dr Jilly James, Dr Priya Antony, Prof. K S Devaky
This work is licensed under a Creative Commons Attribution 4.0 International License.
Hexahydroquinoline-3-carbonitrile as Sustainable Corrosion Inhibitor for Mild Steel: Electrochemical and Surface Investigations
Corresponding Author(s) : K.S. Devaky
Asian Journal of Chemistry,
Vol. 38 No. 4 (2026): Vol 38 Issue 4, 2026
Abstract
A simple and eco-friendly microwave-assisted approach was applied to synthesise hexahydroquinoline-3-carbonitrile derivatives as corrosion inhibitors. The quinoline derivatives were obtained by reacting nitriles and chalcones with ammonium acetate under microwave irradiation. The synthesised hexahydroquinoline-3-carbonitriles were characterised using FT-IR, 1H NMR, 13C NMR, HRMS and SCXRD techniques. The efficiency of synthesised hexahydroquinoline-3-carbonitriles in inhibiting corrosion on mild steel was investigated using electrochemical methods (EIS and polarisation) and surface morphological analysis (AFM). According to EIS and polarization studies, hexahydroquinoline-3-carbonitriles act as mixed-type corrosion inhibitors by adsorbing at the metal/electrolyte interface and thereby preventing mild steel corrosion. The AFM analysis also confirmed that the hexahydroquinoline-3-carbonitriles were successfully adsorbed onto the surface of mild steel.
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- A. Rezvanian, Z. Saeedi and F. Bayat, J. Mol. Struct., 1359, 145314 (2026); https://doi.org/10. 1016/j.molstruc.2026.145314
- Rajni, V. Versha, L. Singh, R. Rana and A. Bendi, ChemistrySelect, 7, e202203648 (2022); https://doi.org/10.1002/slct.202203648
- C.G. Bangcuyo, J.M. Ellsworth, U. Evans, M.L. Myrick and U.H.F. Bunz, Macromolecules, 36, 546 (2003); https://doi.org/10.1021/ma0257200
- S.A. Jenekhe, L. Lu and M.M. Alam, Macromolecules, 34, 7315 (2001); https://doi.org/10.1021/ma0100448
- A.P. Damant, Food Colourants, Woodhead Publishing Ltd. (2011).
- N. Yilmaz, A. Fitoz, Ü. Ergun and K.C. Emregül, Corros. Sci., 111, 110 (2016); https://doi.org/10.1016/j.corsci.2016.05.002
- G. Schmitt, Br. Corros. J., 19, 165 (1984); https://doi.org/10.1179/000705984798273100
- H.M.H. Farh, M.E.B. Seghier and T. Zayed, Eng. Fail. Anal., 143A, 106885 (2023); https://doi.org/10.1016/j.engfailanal.2022.106885
- H.S. Aljibori, A. Alamiery and A.A.H. Kadhum, Int. J. Corros. Scale Inhib., 12, 1476 (2023); https://doi.org/10.17675/2305-6894-2023-12-4-6
- D.-I. Răuță, E. Matei and S.-M. Avramescu, Technologies, 13, 103 (2025); https://doi.org/10.3390/technologies13030103
- M.A. Ahmed, S. Amin and A.A. Mohamed, RSC Adv., 14, 31877 (2024); https://doi.org/10.1039/D4RA05662K
- H. Bairagi, P. Vashishth, G. Ji, S.K. Shukla, E.E. Ebenso and B. Mangla, Corros. Commun., 15, 79 (2024); https://doi.org/10.1016/j.corcom.2023.10.006
- I.A. Wonnie Ma, Sh. Ammar, S.S.A. Kumar, K. Ramesh and S. Ramesh, J. Coat. Technol. Res., 19, 241 (2022); https://doi.org/10.1007/s11998-021-00547-0
- M.A. Quraishi and D. Jamal, Corrosion, 56, 983 (2000); https://doi.org/10.5006/1.3294388
- M. Finšgar and J. Jackson, Corros. Sci., 86, 17 (2014); https://doi.org/10.1016/j.corsci.2014.04.044
- K.R. Ansari, M.A. Quraishi and A. Singh, Measurement, 76, 136 (2015); https://doi.org/10.1016/j.measurement.2015.08.028
- S.A. Abd El-Maksoud and A.S. Fouda, Mater. Chem. Phys., 93, 84 (2005); https://doi.org/10.1016/j.matchemphys.2005.02.020
- R. Yıldız, Corros. Sci., 90, 544 (2015); https://doi.org/10.1016/j.corsci.2014.10.047
- D. Cremer and J.A. Pople, J. Am. Chem. Soc., 97, 1354 (1975); https://doi.org/10.1021/ja00839a011
- J. Bernstein, R.E. Davis, L. Shimoni and N.L. Chang, Angew. Chem. Int. Ed. Engl., 34, 1555 (1995); https://doi.org/10.1002/anie.199515551
- C.F. Mackenzie, P.R. Spackman, D. Jayatilaka and M.A. Spackman, IUCrJ, 4, 575 (2017); https://doi.org/10.1107/S205225251700848X
- B. El Mehdi, B. Mernari, M. Traisnel, F. Bentiss and M. Lagrenée, Mater. Chem. Phys., 77, 489 (2003); https://doi.org/10.1016/S0254-0584(02)00085-8
- X. Tang, M. Li, L. Li, G.N. Mu and G.H. Liu, Surf. Coat. Tech., 201, 384 (2006); https://doi.org/10.1016/j.surfcoat.2005.11.132
References
A. Rezvanian, Z. Saeedi and F. Bayat, J. Mol. Struct., 1359, 145314 (2026); https://doi.org/10. 1016/j.molstruc.2026.145314
Rajni, V. Versha, L. Singh, R. Rana and A. Bendi, ChemistrySelect, 7, e202203648 (2022); https://doi.org/10.1002/slct.202203648
C.G. Bangcuyo, J.M. Ellsworth, U. Evans, M.L. Myrick and U.H.F. Bunz, Macromolecules, 36, 546 (2003); https://doi.org/10.1021/ma0257200
S.A. Jenekhe, L. Lu and M.M. Alam, Macromolecules, 34, 7315 (2001); https://doi.org/10.1021/ma0100448
A.P. Damant, Food Colourants, Woodhead Publishing Ltd. (2011).
N. Yilmaz, A. Fitoz, Ü. Ergun and K.C. Emregül, Corros. Sci., 111, 110 (2016); https://doi.org/10.1016/j.corsci.2016.05.002
G. Schmitt, Br. Corros. J., 19, 165 (1984); https://doi.org/10.1179/000705984798273100
H.M.H. Farh, M.E.B. Seghier and T. Zayed, Eng. Fail. Anal., 143A, 106885 (2023); https://doi.org/10.1016/j.engfailanal.2022.106885
H.S. Aljibori, A. Alamiery and A.A.H. Kadhum, Int. J. Corros. Scale Inhib., 12, 1476 (2023); https://doi.org/10.17675/2305-6894-2023-12-4-6
D.-I. Răuță, E. Matei and S.-M. Avramescu, Technologies, 13, 103 (2025); https://doi.org/10.3390/technologies13030103
M.A. Ahmed, S. Amin and A.A. Mohamed, RSC Adv., 14, 31877 (2024); https://doi.org/10.1039/D4RA05662K
H. Bairagi, P. Vashishth, G. Ji, S.K. Shukla, E.E. Ebenso and B. Mangla, Corros. Commun., 15, 79 (2024); https://doi.org/10.1016/j.corcom.2023.10.006
I.A. Wonnie Ma, Sh. Ammar, S.S.A. Kumar, K. Ramesh and S. Ramesh, J. Coat. Technol. Res., 19, 241 (2022); https://doi.org/10.1007/s11998-021-00547-0
M.A. Quraishi and D. Jamal, Corrosion, 56, 983 (2000); https://doi.org/10.5006/1.3294388
M. Finšgar and J. Jackson, Corros. Sci., 86, 17 (2014); https://doi.org/10.1016/j.corsci.2014.04.044
K.R. Ansari, M.A. Quraishi and A. Singh, Measurement, 76, 136 (2015); https://doi.org/10.1016/j.measurement.2015.08.028
S.A. Abd El-Maksoud and A.S. Fouda, Mater. Chem. Phys., 93, 84 (2005); https://doi.org/10.1016/j.matchemphys.2005.02.020
R. Yıldız, Corros. Sci., 90, 544 (2015); https://doi.org/10.1016/j.corsci.2014.10.047
D. Cremer and J.A. Pople, J. Am. Chem. Soc., 97, 1354 (1975); https://doi.org/10.1021/ja00839a011
J. Bernstein, R.E. Davis, L. Shimoni and N.L. Chang, Angew. Chem. Int. Ed. Engl., 34, 1555 (1995); https://doi.org/10.1002/anie.199515551
C.F. Mackenzie, P.R. Spackman, D. Jayatilaka and M.A. Spackman, IUCrJ, 4, 575 (2017); https://doi.org/10.1107/S205225251700848X
B. El Mehdi, B. Mernari, M. Traisnel, F. Bentiss and M. Lagrenée, Mater. Chem. Phys., 77, 489 (2003); https://doi.org/10.1016/S0254-0584(02)00085-8
X. Tang, M. Li, L. Li, G.N. Mu and G.H. Liu, Surf. Coat. Tech., 201, 384 (2006); https://doi.org/10.1016/j.surfcoat.2005.11.132
