Investigating the Inhibition of Mild Steel Corrosion by Tectona grandis Dye Extract in Acidic Environment: Thermodynamics and Adsorption Properties

Samson Adehuga Omogbehin, Emmanuel Folorunsho Olasehinde, Matthew Ayorinde Adebayo, J. M. Jabar
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Abstract

An investigation into the corrosion inhibition potential of Tectona grandis dye extract on mild steel in 1 M HCl was conducted using weight loss and electrochemical techniques. Adsorption and thermodynamic parameters were also evaluated to understand the influence of extract structure on inhibition performance. Analysis revealed that Tectona grandis dye extract exhibited light absorption properties characteristic of a dye molecule, the Phytochemical analysis of Tectona grandis dye extract shows the presence of Alkaloids, flavonoids, saponins phenols, anthraquinones, and tannins, the result also demonstrated a direct correlation between extract concentration and inhibition efficiency, while an inverse correlation was observed with temperature. Increased activation energy in inhibited solutions supported the temperature dependence. Positive ΔH values indicated an endothermic reaction, and negative ΔGads values suggested spontaneous adsorption following the Langmuir and Freundlich isotherm models. Potentiodynamic polarization curves revealed mixed-type inhibition behavior. These findings suggest the Tectona grandis dye extract possesses promising corrosion inhibition properties.
研究酸性环境中大叶桉染料提取物对低碳钢腐蚀的抑制作用:热力学和吸附特性
采用失重法和电化学技术研究了大叶黄杨染料提取物在 1 M HCl 溶液中对低碳钢的缓蚀潜力。还评估了吸附和热力学参数,以了解提取物结构对抑制性能的影响。分析表明,Tectona grandis 染料提取物表现出染料分子特有的光吸收特性;Tectona grandis 染料提取物的植物化学分析显示,其中含有生物碱、黄酮类、皂苷酚类、蒽醌类和单宁酸;结果还表明,提取物浓度与抑制效率直接相关,而与温度成反比。被抑制溶液中活化能的增加支持了温度依赖性。正ΔH 值表明反应为内热反应,负ΔGads 值表明自发吸附,符合 Langmuir 和 Freundlich 等温线模型。电位极化曲线显示了混合型抑制行为。这些研究结果表明,Tectona grandis 染料提取物具有良好的缓蚀性能。
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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