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Abstract <p>The corrosion inhibition properties of <i>Lavandula angustifolia</i> (LA) extract for C45 steel in a 1 M HCl solution were investigated using weight loss measurements to determine the optimal inhibitor concentrations at room temperature. The performance of LA at deferent temperature (20–50°C) was further evaluated using electrochemical impedance spectroscopy (EIS), including polarization measurements and open circuit potential analysis. The corrosion rates were corroborated by UV-Vis spectroscopy and scanning electron microscopy (SEM). The results demonstrated that LA extract effectively inhibits the corrosion of carbon steel in acidic environments, achieving a maximum inhibition efficiency of 93.87% at an inhibitor concentration of 7 g/L and a temperature of 50°C. Potentiodynamic polarization studies revealed that the inhibitor adsorbs onto the carbon steel surface following the Langmuir adsorption isotherm model, classifying LA as a mixed-type inhibitor. Additionally, the low equilibrium constant <i>K</i><sub>ads</sub> values for the adsorption–desorption process suggest that the inhibition mechanism involves physical adsorption. The LA inhibitor effectively protects the surface against additional corrosion attacks, according to SEM and UV studies. Because the computed quantum parameters agreed with the experimental findings, LA can be utilized as a substitute inhibitor to prevent corrosion in carbon steel.</p>

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Experimental Study and Adsorption Characteristics of Lavandula angustifolia Extract Powder as Corrosion Inhibitor for C45 in 1 M HCl Solution

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Zineb Hamida,
  • Saida Marmi,
  • Malika Nouadji,
  • Hayat Marmi,
  • Abdelouahad Chala,
  • Chahines Siad,
  • Lynda Abdelli,
  • Omar Ben Mya

摘要

Abstract

The corrosion inhibition properties of Lavandula angustifolia (LA) extract for C45 steel in a 1 M HCl solution were investigated using weight loss measurements to determine the optimal inhibitor concentrations at room temperature. The performance of LA at deferent temperature (20–50°C) was further evaluated using electrochemical impedance spectroscopy (EIS), including polarization measurements and open circuit potential analysis. The corrosion rates were corroborated by UV-Vis spectroscopy and scanning electron microscopy (SEM). The results demonstrated that LA extract effectively inhibits the corrosion of carbon steel in acidic environments, achieving a maximum inhibition efficiency of 93.87% at an inhibitor concentration of 7 g/L and a temperature of 50°C. Potentiodynamic polarization studies revealed that the inhibitor adsorbs onto the carbon steel surface following the Langmuir adsorption isotherm model, classifying LA as a mixed-type inhibitor. Additionally, the low equilibrium constant Kads values for the adsorption–desorption process suggest that the inhibition mechanism involves physical adsorption. The LA inhibitor effectively protects the surface against additional corrosion attacks, according to SEM and UV studies. Because the computed quantum parameters agreed with the experimental findings, LA can be utilized as a substitute inhibitor to prevent corrosion in carbon steel.