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<p>This study examines the corrosion prevention properties of Okoubaka seed extract (OSE) on mild steel in an acidic environment. The extract was evaluated using various analytical techniques, including mass-loss measurements, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). The outcome highlighted that OSE is an efficient mixed-type inhibitor, significantly reducing corrosion rates. The inhibitory effectiveness was concentration dependent, with optimal performance observed at a concentration of 2.5&#xa0;g/L, yielding a percentage inhibitory efficacy (IE%) above 90.0% as determined from mass-loss data. The bonding of OSE onto the metal surface followed a spontaneous physisorption mechanism, as evidenced by the negative value of the Gibbs free energy change (ΔG°). Surface analysis techniques confirmed the formation of a protective film on the metal surface. FTIR spectroscopy indicated the presence of functional groups in the extract that interact with the metal surface, contributing to corrosion inhibition. Overall, the findings of this study demonstrate the potential of OSE as a sustainable and environmentally safe corrosion inhibitor for mild steel under acidic conditions.</p>

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Okoubaka seed extract: a sustainable corrosion inhibitor for mild steel in acidic medium

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Christogonus Oudney Akalezi,
  • Justina Nnenna Obi,
  • Edith Nneoma Alisa,
  • Gladstone Azubuike Otuuh,
  • Christopher Onyemeziri Alisa

摘要

This study examines the corrosion prevention properties of Okoubaka seed extract (OSE) on mild steel in an acidic environment. The extract was evaluated using various analytical techniques, including mass-loss measurements, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). The outcome highlighted that OSE is an efficient mixed-type inhibitor, significantly reducing corrosion rates. The inhibitory effectiveness was concentration dependent, with optimal performance observed at a concentration of 2.5 g/L, yielding a percentage inhibitory efficacy (IE%) above 90.0% as determined from mass-loss data. The bonding of OSE onto the metal surface followed a spontaneous physisorption mechanism, as evidenced by the negative value of the Gibbs free energy change (ΔG°). Surface analysis techniques confirmed the formation of a protective film on the metal surface. FTIR spectroscopy indicated the presence of functional groups in the extract that interact with the metal surface, contributing to corrosion inhibition. Overall, the findings of this study demonstrate the potential of OSE as a sustainable and environmentally safe corrosion inhibitor for mild steel under acidic conditions.