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<p>This study uniquely explores agro-waste cassava (<i>Manihot esculenta</i>) peels, abundant in West Africa, as a sustainable corrosion inhibitor, emphasising its concentration and temperature-dependent performance on AA6063 in 1 M NaOH. Electrochemical techniques, including potentiodynamic polarisation and open-circuit potential measurements, were employed to evaluate the inhibition efficiency (IE) and adsorption behaviour of the extract. The results indicate that cassava extract acts as an effective corrosion inhibitor, achieving up to 87.45% inhibition efficiency at 0.3 mL inhibitor dosage. Adsorption studies using Langmuir, Freundlich, and Temkin isotherms reveal a mixed adsorption mechanism, predominantly physical in nature, with ΔG°<sub>ads</sub> values ranging from –16.78 to –20.12 KJ.mol⁻<sup>1</sup>, confirming spontaneous and predominantly physical adsorption. Response surface methodology (RSM) and central composite design (CCD) optimisation identified an ideal inhibitor dosage of 0.28 mL at 46.65°C, minimising the corrosion rate to 0.208 mm/yr. The findings highlight cassava extract as a promising, eco-friendly inhibitor for aluminium alloys in alkaline environments.</p>

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Interrogating the Corrosion Inhibition Mechanism of Cassava (Manihot esculenta) Extract for AA6063 in NaOH

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • Ojo S. I. Fayomi,
  • Joshua O. Atiba,
  • Onyeka G. Ogbuozobe

摘要

This study uniquely explores agro-waste cassava (Manihot esculenta) peels, abundant in West Africa, as a sustainable corrosion inhibitor, emphasising its concentration and temperature-dependent performance on AA6063 in 1 M NaOH. Electrochemical techniques, including potentiodynamic polarisation and open-circuit potential measurements, were employed to evaluate the inhibition efficiency (IE) and adsorption behaviour of the extract. The results indicate that cassava extract acts as an effective corrosion inhibitor, achieving up to 87.45% inhibition efficiency at 0.3 mL inhibitor dosage. Adsorption studies using Langmuir, Freundlich, and Temkin isotherms reveal a mixed adsorption mechanism, predominantly physical in nature, with ΔG°ads values ranging from –16.78 to –20.12 KJ.mol⁻1, confirming spontaneous and predominantly physical adsorption. Response surface methodology (RSM) and central composite design (CCD) optimisation identified an ideal inhibitor dosage of 0.28 mL at 46.65°C, minimising the corrosion rate to 0.208 mm/yr. The findings highlight cassava extract as a promising, eco-friendly inhibitor for aluminium alloys in alkaline environments.