• Nnenna Odozi University of Ibadan
  • Chioma Festus
  • Keerabana Sorbari
Keywords: Schiff base, hydroxypyridine, physiosorption, adsorption and corrosion


The title Schiff base LH obtained by the reflux condensation of 2-hydroxy-1,4-napthoquinone and 2-amino-3-hydroxypyridine has been characterized via conventional procedures. Adsorption and corrosion inhibition potentials of LH were examined by considering its inhibitory efficiency on mild steel in 1M HCl via weight loss assessment, scanning electron microscopy and density functional theory. Analytical and spectroscopic methods corroborate the bidendate ketoimine-tautomeric assemblage of LH and its stability at ambient temperature. The weight loss measurement was performed at mixt temperatures of 303-343 K and inhibitor concentrations of 1x10-5 M- 9x10-5 M with immersion period of 5 h. Higher efficiency of 94.6% was attained with an inhibitor concentration of 9x10-5 M at 303 K. The adsorption of LH on mild steel (ms) was found to conform with Langmuir absorption isotherm model, while free energy of adsorption showed a spontaneous physiosorption. The computed activation energy (Ea) along other thermodynamic parameters (ΔS and ΔH) was consistent with the latter. The SEM results revealed that the ms superficial was smooth with the inhibitor compared to the ms superficial without the inhibitor indicating inhibition of corrosion of the ms by establishing a layer of protection on the surface. The density functional theory result was in agreement with experimental results.


Abel-Olaka, L. C., Kpee, F. and Festus, C. (2019). Solvent Extraction of 3d Metallic Elements using N2O2 Schiff Base-Chelators: Synthesis and Characterization. Nigerian Research Journal of Chemical Sciences. 7(2); 133-146.
Abiola, O. K. and James, A. O. (2009). The effects of Aloe vera extract on corrosion and
Kinetic of corrosion process of Zinc in HCl solution. Corrosion Science, 51, 1879
Akhmetov, B., Novicchenko, Y.V. and Chapurin, V. (1989). Physical and Colloid Chemistry, 1st
Edition, Mir Publishers, Moscow, 1989.
ASM International, Understanding the Basis: The effect and economic importance of corrosion, Ohio, 2000.
Bhawsar, J., Jain, P. K. and Jain, P. (2012); Experimental and computational studies of Nicotiana tobacum leaves extract as green corrosion inhibition for mild steel in acidic medium. Alexandria Engineering Journal, 54:769-775.
Ebenso, E. E., Taner, A., Fatma, K.,Ian, L., Cemi̇l, Ö., Murat, S. and Savıour, A. U. (2010). Theoretical studies of some sulphonamides as corrosion inhibitors for mild steel in acidic medium. Int. J. Quant. Chem., 110 (2010) 1003-1018.
Dada, A. O., Abiodun, P. O., Ayomadewa, O. and Adewumi, O. D. (2012). Langmuir, Feundlich, Temkin and Dubinin -Radushkevich isotherm studies of equilibrium sorption of Zn2 unto phosphoric acid modified rice Husk. J. of Appl. Chem. 3(1):38-45.
El-Sherif, R. M. and Badawy, W. A. (2011). Mechanism of corrosion and corrosion inhibition of tin in aqueous solution containing tartaric acid. Int. J. Electrochem. Sci., 6: 6469.
Festus, C., Ekennia, A.C., Osowole, A.A., Olasunkanmi, L.O., Onwudiwe, D.C. and Oguejiofor, T.U Synthesis, experimental and theoretical characterization and antimicrobial studies of some Fe(II), Co(II) and Ni(II) complexes of 2-(4,6-dihydroxypyrimidin-2-ylamino)naphthalene-1,4-dione. Research on Chemical Intermediates, 44(10):5857-5877; DOI 10.1007/s11164-018-3460-7
Festus, C., Odozi, W. N. and Olakunle M.. (2020). Preparation, spectral characterization and corrosion inhibition studies of (e)-n-{(thiophene-2-yl)methylene}pyrazine-2-carboxamide schiff base ligand. Protection of Metals and Physical Chemistry of Surfaces. 56(3); 651–662.
Festus, C., Jude, I. A., Collins, U. I. (2021). Ligation Actions of 2-(3-hydroxypyridin-2-ylamino)naphthalen-1,4-dione: Synthesis, Characterization, In-vitro Antimicrobial Screening, and Computational Studies. Indian Journal of Heterocyclic Chemistry, 31(01); 1-13.
Festus C., Don-Lawson, C. D. and Ima-Bright N. (2019). Synthesis Involving Asymmetric Pyrazine-Schiff Base with Co2+, Ni2+ and Cu2+ ions: Spectral and Magnetic Characterization; and Antibacterial studies. Int.l J. of Research & Innovation in Applied Science; 4(4).
Festus, C. Collins, U. I. and Obinna, O. (2020). Novel 3d divalent metallic complexes of 3-[(2-hydroxy-5-methylphenylimino)-methyl]-napthalen-2-ol: Synthesis, spectral, characterization, antimicrobial and computational studies. Journal of Molecular Structure 1210 (2020); 1-13.
Gomez, B. N.V., Likhanova, M. A., Dominguez-Aguilar, R., Martinez, A. and Vela, J. L. Gazquez, J. (2006). Phys. Chem. B 110 : 8928-8934
Guo, L., Zhu, S., Zhang, S., He, Q. and Li, W. (2014). Theoretical studies of three triazole derivatives as corrosion inhibitors for mild steel in acidic medium. Corros Sci 2014; 87: 366–375
Güvenç, G. (2018). Experimental and theoretical study of a novel naphthoquinone Schiff base. Open chem. 16; 2018-0121
Hasanov R, Sadikoglu M, Bilgic S (2007).Electrochemical and quantum chemical studies of some Schiff bases on the corrosion of steel in H2SO4 solution. Appl. Surf. Sci., 253: 3913-3921
Ituen, E. B., Udo, U. E., Odozi, N. W.and Dan, E. U. (2013). Adsorption and kinetic/themodynamic characterization of aluminum corrosion inhibitor in sulphuric acid by extract of Alstonia boonei J. of Appl. Chem. 52-59.
Ituen, E. B., Udo, James, A.O., and Akaranta, O. (2017). Elephant grass biomass extract as corrosion inhibitor for mild steel in acidic medium. Journal of Material and Environmental Sciences 8.4:1498-1505.
Khadom, A. A., Yaro, A. S. and Khadum, A. A. H. (2010). Adsorption mechanism of benzothiazole for corrosion inhibition of copper-nickel alloy in hydrochloric acid. J. Chilean Chem. Soc. 55:150-152.
Kpee, F., Ukachukwu, C. V. and Festus, C. (2018). Synthesis, Characterization and Extractive Potentials of Aminopyrimidine Schiff Base Ligands on Divalent Metal Ions. Nigerian Research Journal of Chemical Sciences. 4(2); 193-203.
Limousin, G., Gaudet, J. P., Charlet, L., Szenknect, S., Barthes, V. and Krimissa, M. (2007). Sorption isotherms: A review on physical bases, modeling and measurement. Appl. Geochem., 22: 249-275
Lukovits, I., Kálmán, E. and Fabrizio, Z. (2001). Corrosion Inhibitors—Correlation between Electronic Structure and Efficiency. Corrosion -Houston Tx- 57(1):3-8 DOI:10.5006/1.3290328
Machnikova, E., Kenton, W. and Hackerman, E. (2008). Corrosion inhibition of carbon steel in hydrochloric acid by furan derivatives. Electrochimica Acta, 53(20):6024-6032 ·
Mert B. D., Yuce, A. O., Kardas, G. and Yazici, B. (2014). Inhibition effect of 2-amino-4-methylpyridine on mild steel corrosion: experimental and theoretical investigation. Corros. Sci. 85:287-295.
Obi-Egbedi, N. O. and Obot, I. B. (2013). Xanthone; A new and effective corrosion inhibitor for mild steel in sulfuric acid solution, Arabian, J. of Chem. 6, 211-223
Obot, I. B. and Obi-Egbedi, N. O. (2010). Adsorption properties and inhibition of mild steel in sulfuric acid solution by ketoconazone: Experimental and theoretical investigation. Corr. Sci. 52 198-204.
Odozi, W. N., Festus C. and Muhammad, A. D. (2020). Synthesis, adsorption and inhibition behaviour of 2-[(thiophen-2-ylmethylidene)amino] pyridine-3-ol on mild steel corrosion in aggressive acidic media. Nigerian Research Journal of Chemical Sciences. 8,(2); 291-307.
Oguzie, E. E., Adindu, C. B., Enenebeaku, C. K., Ogukwe, C. E., Chidiebere, M. A. and Oguzie, L. L. (2012). Natural products for materials protection: Mechanism of corrosion inhibition of mild steel by acid extracts of Piper guineense. Journal of Physical Chemistry,
Osowole, A. A. and Festus, C. (2013). Synthesis, characterization and antibacterial activities of some metal(II) complexes of 3-(-1-(2-pyrimidinylimino)methyl-2-napthol. Elixir Appl. Chem. 59 (2013) 15843-15847
Osowole, A.A. and Festus, C. (2015). Synthesis, characterization, antibacterial and antioxidant activities of some heteroleptic Metal(II) complexes of 3-{[-(pyrimidin-2-yl)imino]methyl}napthalen-2-ol. Journal of Chemical, Biological and Physical Sciences. 6(1); 080-089.
Popova, A., Sokolova, E., Raicheva, S. and Christov, M. (2003). AC and DC study of the temperature effect on mild steel corrosion in acid media in the presence of benzimidazole derivatives. Corrosion Science, 45(1): 33-58.
Şaban, E., Zaki, S., Safi, S., Dilara, Ö. and LeiGuo, C. K. (2017) A computational study on corrosion inhibition performances of novel quinoline derivatives against the corrosion of iron. Journal of molecular science. 751-761.
Seifzadeh, D., Basharnawaz, H, Bezaatpou A. (2013). A Schiff base compound as effective corrosion inhibitor for magnesium in acidic media. Mater. Chem. Phys. 138:794- 804.
Shaban, S. M., Aiad, I., El-Sukkary, M. M., Soliman, E. A. and El-Awady, M.Y. (2015). Inhibition of mild steel corrosion in acidic medium by vanillin cationic inhibitor. J. Mol. Liq. 203: 26-28.
Shukla, S. K. and Ebenso, E. E. (2011). Corrosion inhibition, Behaviour and thermodynamic properties of streptomycin on mild steel in hydrochloric acid medium. Int. J. Elechem Sci. 6: 3281-3286
Ulaeto, S. B., Ekpe, U. J., Chidiebere, M. A. and Oguzie, E. E. (2012). Corrosion inhibition of mild steel in hydrochloric acid by acid extract of Eichhornia crassipes. Intl J. of Material and Chem., 2(4):158-164
Umoren, S. A. and Ebenso, E. E. (2007). The synergistic effect of polyacrylamide and iodided ions on the corrosion of mild steel in H2SO4. Materials Chemistry and Physics, 106: 387-393.
Vadi, M., Abbasi, M., Zakeri, M. and Yazdi, J. (2010). Application of the Freundlich, Langmuir, Temkin and Harkins-Jura adsorption isotherms for some amino acida and amino acdis complexation with manganese (ii) on carbon nanotube. Proceedings of International Conference of Nanotechnology and Biosensors. Journal. Phys. Theor. Chem 7(2):95-104
Verma, C., Singh, P. and Quraishi, M. A. (2016). A thermodynamic, electrochemical and surface investigation of Bis(indolyl) methanes as green corrosion inhibitors for mild steel in 1M HCl acid solution. J. Asso. Arab Univ. Bas. Appl. Sci., 21: 24-30
Villamil, R. F. V., Corio, P., Agostinho, S. M. L. and Rubim, J. C. (1999). Effect of sodium dodecylsulphate on copper corrosion in sulphuric acid media in the absence and presence of benzotriazole. J. Electroanalytical Chem, 472(2): 112-9.
Zhifeng, Z., Fengjuan, W., Yao, L., Shengping, W., Weihua, L., Wei, S., Dong, G. and Jinyang, J. (2018) Molecule adsorption and corrosion mechanism of steel under protection of inhibitor in a simulated concrete solution with 3.5% NaCl. RSC Adv., 8(20648). DOI: 10.1039/c8ra03235a
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