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<p>The Corrosion protection potential and surface adsorption behavior traits of <i>Limonia acidissima</i> (LA) leaf extract for mild steel in acidic medium have been inquired utilizing SEM, EIS, PDP, Adsorption isotherm, UV–vis spectroscopy, and wettability through contact angle analysis. Notably, incorporating LA, especially at a high dosage of 800&#xa0;ppm, significantly mitigated oxidation, attaining a remarkable protective proficiency of 92.52% in 6&#xa0;h. Adsorption analyses revealed that while both Langmuir and Freundlich models described the inhibitor’s behavior, the Freundlich isotherm showed a superior fit (<i>R</i><sup>2</sup> = 0.977), indicating multilayer adsorption on a heterogeneous mild steel surface at 303&#xa0;K. Electrochemical impedance spectroscopy further validated the inhibitor’s ability to form a protective barrier against corrosion. The contact angle of 70.6° of MS with inhibitor demonstrates that the plant extract increases the hydrophobicity of mild steel and enhances its resistance to corrosion. UV–vis spectroscopy shows that LA is an effective corrosion inhibitor, forming a protective interaction with the metal surface. SEM imagery revealed diminished surface degradation and fewer corrosive pits, affirming LA’s efficacy in preserving the integrity of mild steel under acidic conditions.</p>

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Limonia acidissima as green corrosion inhibitor for mild steel in acidic medium: phytochemical screening, electrochemical studies, and surface morphology

  • 期刊论文

  • 发表日期：

    2025年12月25日

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  • Mukta Garg,
  • Navneet Kaur,
  • Manvinder Kaur,
  • Harvinder Singh Sohal

摘要

The Corrosion protection potential and surface adsorption behavior traits of Limonia acidissima (LA) leaf extract for mild steel in acidic medium have been inquired utilizing SEM, EIS, PDP, Adsorption isotherm, UV–vis spectroscopy, and wettability through contact angle analysis. Notably, incorporating LA, especially at a high dosage of 800 ppm, significantly mitigated oxidation, attaining a remarkable protective proficiency of 92.52% in 6 h. Adsorption analyses revealed that while both Langmuir and Freundlich models described the inhibitor’s behavior, the Freundlich isotherm showed a superior fit (R2 = 0.977), indicating multilayer adsorption on a heterogeneous mild steel surface at 303 K. Electrochemical impedance spectroscopy further validated the inhibitor’s ability to form a protective barrier against corrosion. The contact angle of 70.6° of MS with inhibitor demonstrates that the plant extract increases the hydrophobicity of mild steel and enhances its resistance to corrosion. UV–vis spectroscopy shows that LA is an effective corrosion inhibitor, forming a protective interaction with the metal surface. SEM imagery revealed diminished surface degradation and fewer corrosive pits, affirming LA’s efficacy in preserving the integrity of mild steel under acidic conditions.