Document Type : Original Research Article


Department of Chemistry, Federal University of Agriculture, PMB, 2373, Makurdi, Nigeria


Cycloeucalenol (CEU) was the major composition of the Benue Propolis extracts identified via proton NMR. The corrosion inhibition behaviour of this extracts on carbon steel in 1.0 M HCl was investigated by using weight loss, electrochemical impedance spectroscopy, and computational methods. The results obtained revealed that the inhibition efficiency increased with an increase in inhibitor concentration, but decreased with increase in temperature. Impedance measurement showed that charge transfer was responsible for the corrosion process. The charge transfer resistance (R2) increased with concentration of the inhibitor as opposed to the double layer capacitance (Cdl) which decreased. The values of the Gibbs free energy (ΔG°) indicated a spontaneous adsorption of the extract components on the metal surface. The physically adsorbed propolis extract onto the carbon steel surface followed Langmuir adsorption isotherm model. The HOMO map shows the electron cloud situated in the C=C sp2 group, and then spread across the three consecutive cyclohexane rings and their substituents. From the Fukui function indices calculations, CEU is discovered to have its site for nucleophilic and electrophilic attacks each at one of carbon atoms of the alkene group in the molecule. The results have demonstrated that the composition of Benue propolis is active inhibitor of corrosion of carbon steel surface in HCl acidic medium. 

Graphical Abstract

Corrosion Inhibition Potential of Benue Propolis Extracts on Carbon Steel in 1.0 M Hydrochloric Acid Medium: Experimental and Computational Studies


Main Subjects

[1]          D. Zhang, H. Zhang, S. Zhao, Z. Li, S. Hou, Electrochemical Impedance Spectroscopy Evaluation of Corrosion Protection of X65 Carbon Steel by Halloysite Nanotube-Filled Epoxy Composite Coatings in 3.5% NaCl Solution. Int. J. Electrochem. Sci., 14 (2019) 4659 - 4667.
[2]          B.R. Fazal, T. Becker, B. Kinsella, K. Lepkova, A review of plant extracts as green corrosion inhibitors for CO2 corrosion of carbon steel. npj Materials Degradation, 5 (2022).
[3]          D.C. Benjamin, A.L. Richard, H.R. David, Corrosion control and monitoring; a program management guide for selecting materials. Advanced Materials, Manufacturing and Testing Information Analysis Center (AMMTIAC), New York, USA, (2006) 1-19.
[4]          G.A. Ijuo, S. Nguamo, J.O. Igoli, Ag-nanoparticles Mediated by Lonchocarpus laxiflorus Stem Bark Extract as Anticorrosion Additive for Mild Steel in 1.0 M HCl Solution. Prog. Chem. Biochem. Res., 5(2022) 133-146.
[5]          A.K. Kuropatnicki, E. Szliszka, W. Krol, Historical aspects of propolis research in modern times. Evid. Based Complement. Alternat. Med., 2013 (2013).
[6]          E.V. Starostensko, Propolization by bees of various races, Pchelovodsvo, 88 (1968) 30.
[7]          V.D. Wagh, Propolis, a wonder bees product and its pharmacological potentials. Adv Pharmacol Sci., 308249 (2013)
[8]          G.A. Burdock, Review of the biological properties and toxicity of bee propolis. Food and Chemical Toxicology., 36 (1998) 347-363
[9]          S. Patil, N. Desai, K. Mahadik, A. Paradkar, can green synthesized propolis loaded silver nanoparticulate gel enhance wound healing caused by burns? European Journal of Integrative Medicine., S1876-3820 (2015) 00043-8
[10]       H.F.Chahul, C.O. Akalezi, A.M. Ayuba, Effect of adenine, guanine and hypoxanthine on the corrosion of mild steel in H3PO4. International Journal of Chemical Science, 7 (2015) 2006-3350.
[11]       C.V.S. Prakash, I. Prakash, Isoliation and Structural Characterisation of Lupane Tritepenes from Polypodium Vulgare, Research Journal of Pharmaceutical Sciences., 1 (2012) 23-27
[12]       E.A. Adewusia, P. Steenkamp, G. Fouche, and V. Steenkamp, Isolation of cycloeucalenol from Boophone disticha and evaluation of its cytotoxicity, Natural Product Communications, 8 (2013) 1213-1216
[13]       N. Bhardwaj, P. Sharma, V. Kumar Phytochemicals as steel corrosion inhibitor: an insight into mechanism Tenside Surfact. Det., 59 (2022) 81-94.
[14]       W.A.W. Elyn, Corrosion inhibition of mild steel in 1 M HCl solution by Xylopia Ferruginea leaves from different extract and partitions, Int. J. Electrochem. Sci. 6 (2011) 2998-3016.
[15]       G.A. Ijuo, A.M. Orokpo, P.N. Tor, Effect of Spondias mombin Extract on the Corrosion of Mild Steel in Acid Media, Chemrj, 3 (2018) 64-77
[16]       E. Ituen, A. Singh, L. Yuanhua, O. Akaranta, Green synthesis and anticorrosion effect of Allium cepa peels extract-silver nanoparticles composite in simulated oilfield pickling solution, SN Appl. Sci., 3 (2021) 679.
[17]       N.B. Iroha, N.J. Maduelosi, Corrosion Inhibitive Action and Adsorption Behaviour of Justicia Secunda Leaves Extract as an Eco‐Friendly Inhibitor for Aluminium in Acidic Media, 11 (2021) 13019–13030
[18]       A.I. Ali, Y.S. Mahrousb, Corrosion inhibition of C-steel in acidic media from fruiting bodies of Melia azedarach L extract and a synergistic Ni2+ additive, RSC Adv. 7 (2017) 23687-23698
[19]       N. AI Otaibi, H.H. Hammud, Corrosion Inhibition Using Harmal Leaf Extract as an Eco-Friendly Corrosion Inhibitor, Molecules, 26 (2021) 7024.
[20]       O.O. Adeyemiand, O.O. Olubomehin, Investigation of Anthocleista djalonesis stembark extract of corrosion inhibitor for aluminium. Pacific J. Sci. Technol. 11 (2010) 455-462.
[21]       M. Ismail, A.S. Abdulrahman, M.S.Hussain, Solid waste as environmental benign corrosion inhibitors in acid medium. Int. J. Engg. Sci. Technol., 3(2) (2011) 1742-1748.
[22] E.F. Olasehinde, S.J. Olusegun, A.S. Adesina, S.A. Omogbehin, H. Momoh- Yahayah, Inhibitory action of Nicotiana tobacum extracts on the corrosion of mild steel in HCl: adsorption and thermodynamic study, Natural Science., 11 (2013) 83-90
[23]       N. J. Maduelosi and N.B. Iroha, Insight into the Adsorptive Inhibitive effect of Spironolactone Drug on C38 Carbon Steel Corrosion in Hydrochloric Acid Environment. Journal of Bio and Tribo-Corrosion, 7 (2021) z.
[24]       N.O. Eddy and A.S. Ekop, Inhibition of corrosion of zinc in 0.1M H2SO4 by 5-amino-1-cyclopropyl-7-[(3r,5s) 3, 5-dimethylpiperazin-1-yl]-6,8-difluoro-4-oxoquinolne-3-carboxylic acid, Material Science AIJ., 4 (2007) 2008-2016.
[25]       S. Kim, P.A. Thiessen, E.E. Bolton, J. Chen, G. Fu, A. Gindulyte, L. Han, J. He, S. He, B.A. Shoemaker, and J. Wang, substance and compound databases. Nucleic acids research, Pub Chem., 44 (2016) D1202-D1213.
[26]       Z.Z.H. Zhenli, The Computation Basis of Software CS Chem3D and its Application in Organic Chemistry, Guang Zhou Chemical Industry and Technology, 2 (2002).
[27]       R. Dennington, T.A. Keith, J.M. Millam, GaussView 6.0. 16, Shawnee Mission, 2016.
[28]       M.J. Frisch, G.W. Trucks, H.B. Schlegel, G.E. Scuseria, M.A. Robb, J.R. Cheeseman, G. Scalmani, V. Barone, G.A. Petersson, H. Nakatsuji, X. Li, Gaussian., 16 (2016).
[29]       F.J. Devlin, J.W. Finley, P.J. Stephens, and M.J. Frisch, Ab initio calculation of vibrational absorption and circular dichroism spectra using density functional force fields: a comparison of local, nonlocal, and hybrid density functionals. The Journal of Physical Chemistry, 99(1995) 16883-16902.
[30]       R.K. Roy, S. Krishnamurti, P. Geerlings, and S. Pal, Local softness and hardness-based reactivity descriptors for predicting intra-and intermolecular reactivity sequences: carbonyl compounds, The Journal of Physical Chemistry A, 102 (1998) 3746-3755.
[31]       I.B. Obot, D.D. Macdonald, and Z.M. Gasem, Density functional theory (DFT) as a powerful tool for designing new organic corrosion inhibitors. Part 1: an overview. Corrosion Science, 99 (2015) 1-30.