Comparative Investigation of the Corrosion Protection Efficacy of Spondias mombin Leaf Extracts on AA2024 Alloy and Low Carbon Steel in Acidic Medium

Physical Science International Journal Pub Date : 2024-04-08 DOI:10.9734/psij/2024/v28i3828

K. Ogwo, L. Nnanna, Ahamefule C. Young, E. A. Eziyi

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Abstract

The anti-corrosive property of Spondias mombin (SM) leaves extract on low carbon steel (LCS) and aluminium alloy (AA2024) in 1M HCl solution was investigated using gravimetric and electrochemical methods. The results obtained from the weight loss experiment performed at various temperatures (30, 45, and 60 0C) show that the inhibition efficiency values decreased with temperature rise but increased as the inhibitor concentrations were increased. At 30 0C, optimum inhibition efficiency (IE) of 80.11% and 78.06% were obtained for LCS and AA2024 respectively. The potentiodynamic polarization (PDP) result reveal that an optimum IE values of 92.1% and 74.0% were respectively obtained for LCS and AA2024 while the electrochemical impedance spectroscopy (EIS) data show IE values of 91.5% and 74.5% for LCS and AA2024 respectively. In all cases, the values of inhibition efficiency obtained for LCS were greater than those obtained for AA2024. This implies that SM leaf extracts offers a better protective-layer on LCS surface compared to the AA2024 alloy in the acidic medium. The isotherm study reveal that Langmuir model best fitted the adsorption of the leaf extracts on LCS while Freundlich model best fitted the leaf extracts adsorption on AA2024 surface.

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Spondias mombin 叶提取物在酸性介质中对 AA2024 合金钢和低碳钢的腐蚀防护功效比较研究

采用重量法和电化学法研究了 Spondias mombin（SM）叶提取物在 1M HCl 溶液中对低碳钢（LCS）和铝合金（AA2024）的抗腐蚀性能。在不同温度（30、45 和 60 0C）下进行的失重实验结果表明，抑制效率值随着温度的升高而降低，但随着抑制剂浓度的增加而升高。在 30 0C 时，LCS 和 AA2024 的最佳抑制效率（IE）分别为 80.11% 和 78.06%。电位极化（PDP）结果显示，LCS 和 AA2024 的最佳 IE 值分别为 92.1%和 74.0%，而电化学阻抗谱（EIS）数据显示，LCS 和 AA2024 的 IE 值分别为 91.5%和 74.5%。在所有情况下，LCS 的抑制效率值都高于 AA2024。这意味着，在酸性介质中，与 AA2024 合金相比，SM 叶提取物能在 LCS 表面形成更好的保护层。等温线研究表明，Langmuir 模型最适合叶提取物在 LCS 上的吸附，而 Freundlich 模型最适合叶提取物在 AA2024 表面的吸附。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Physical Science International Journal

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