Comparative Electrochemical and Corrosion Inhibition Assessment of Commercial Tannic Acid, Crude Extracts, and n-Butanol Fractions of Quercus robur Stem Bark

Bibisara D. Burkitbayeva; Adewale O. Adeloye; Alfira F. Miftakhova; Raigul Zh. Jumanova; Gulmira S. Beisenova; Akmaral M. Argimbayeva; Gulzhan Seit; Yeldana G. Bakhytzhan; Aruzhan B. Smail

doi:10.31489/2959-0663/3-26-13

Authors

Bibisara D. Burkitbayeva al-Farabi Kazakh National University, Almaty, Kazakhstan
Adewale O. Adeloye al-Farabi Kazakh National University, Almaty, Kazakhstan https://orcid.org/0000-0003-1736-5738
Alfira F. Miftakhova al-Farabi Kazakh National University, Almaty, Kazakhstan https://orcid.org/0000-0001-5518-7384
Raigul Zh. Jumanova al-Farabi Kazakh National University, Almaty, Kazakhstan https://orcid.org/0009-0007-7320-3676
Gulmira S. Beisenova al-Farabi Kazakh National University, Almaty, Kazakhstan https://orcid.org/0000-0002-6751-9451
Akmaral M. Argimbayeva al-Farabi Kazakh National University, Almaty, Kazakhstan
Gulzhan Seit al-Farabi Kazakh National University, Almaty, Kazakhstan https://orcid.org/0009-0004-0373-3872
Yeldana G. Bakhytzhan al-Farabi Kazakh National University, Almaty, Kazakhstan https://orcid.org/0000-0002-3217-5927
Aruzhan B. Smail al-Farabi Kazakh National University, Almaty, Kazakhstan

DOI:

https://doi.org/10.31489/2959-0663/3-26-13

Keywords:

Quercus robur, tannins, corrosion inhibitor, mild steel, potentiodynamic polarization, Langmuir adsorption isotherm, n-butanol fraction, commercial tannic acid, adsorption isotherms

Abstract

In this study, crude aqueous-ethanolic extract and n-butanol fraction of Quercus robur stem bark were obtained, and their corrosion-inhibition performance on mild steel in 1 M HCl was evaluated while their performances are compared to the commercial tannic acid used as standard. Corrosion inhibition was assessed by potentiodynamic polarization at 200 mg L⁻¹ after 1 hour of immersion. The n-butanol fraction exceeded the 71.9 % efficiency of the crude extract, though remaining below the 98.2 % maximum efficiency observed for the tannic acid standard at 1000 mg L⁻¹. Polarization curve shifts support classifying the tannin-containing samples as mixed-type inhibitors. Adsorption-isotherm analysis showed model-dependent behavior: the Freundlich model provided the highest R² for the crude extract, while the Langmuir model provided the highest R² for the n-butanol fraction and tannic acid. These fits represent empirical descriptions of concentration-dependent inhibition rather than direct molecular mechanisms. For commercial tannic acid, the standard Gibbs free energy of adsorption as approximately -33.3 kJ mol⁻¹, indicating thermodynamically favorable adsorption. Overall, solvent fractionation improved inhibition performance. These findings indicate the n-butanol fraction's potential as a plant-derived inhibitor. Further phytochemical investigation, isolation and characterization are required to properly identify the active constituents underlying the adsorption mechanisms.

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Comparative Electrochemical and Corrosion Inhibition Assessment of Commercial Tannic Acid, Crude Extracts, and n-Butanol Fractions of Quercus robur Stem Bark

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