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<p>Growing environmental awareness has led to a significant increase in the demand for high-performance, cost-effective and environmentally friendly corrosion inhibitors. In this manuscript, <i>Melissa officinalis</i> ethanolic extract (MO) was utilised as a sustainable corrosion inhibiting agent for API 5&#xa0;L X70 steel in 1&#xa0;M HCl corrosive medium. According to Fourier Transform Infrared spectroscopy (FT-IR) and Liquid Chromatography–Mass Spectrometry (LC-MS), MO contains a variety of functionally active groups, which may give MO molecules a strong ability to adsorb on metal surfaces. A comprehensive set of methods, including weight loss, potentiodynamic polarisation, electrochemical impedance spectroscopy and surface analysis, has been employed to assess the MO extract’s inhibitory performance. After testing a range of concentrations in a 1&#xa0;M HCl medium, the highest level of inhibition was obtained at 500 ppm and attained 89.0% in weight loss measurement, 93.5% in potentiodynamic polarisation, and 91.7% in electrochemical impedance spectroscopy, indicating that the extract effectively inhibits corrosion under the tested conditions. The inhibition mechanism involved physical adsorption on metal surfaces according to the Langmuir model, which enhances the corrosion inhibiting ability. Electrochemical and surface analysis techniques, such as Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM), confirmed that the extract creates a protective layer that effectively inhibits corrosion, where the steel’s average roughness decreased from Ra = 689&#xa0;nm to Ra = 93.8&#xa0;nm at the optimal inhibitor concentration. These findings show that the extract has strong anticorrosive properties.</p>

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Investigation of the Corrosion Inhibitory Effect of Melissa officinalis Ethanolic Extract on API 5L X70 Steel in Hydrochloric Acid

  • 期刊论文

  • 发表日期：

    2026年2月10日

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  • Hana Karahacane,
  • Abdelkader Khadraoui,
  • Kamel Hachama,
  • Amel Kouache,
  • Mohamed Chaouchi

摘要

Growing environmental awareness has led to a significant increase in the demand for high-performance, cost-effective and environmentally friendly corrosion inhibitors. In this manuscript, Melissa officinalis ethanolic extract (MO) was utilised as a sustainable corrosion inhibiting agent for API 5 L X70 steel in 1 M HCl corrosive medium. According to Fourier Transform Infrared spectroscopy (FT-IR) and Liquid Chromatography–Mass Spectrometry (LC-MS), MO contains a variety of functionally active groups, which may give MO molecules a strong ability to adsorb on metal surfaces. A comprehensive set of methods, including weight loss, potentiodynamic polarisation, electrochemical impedance spectroscopy and surface analysis, has been employed to assess the MO extract’s inhibitory performance. After testing a range of concentrations in a 1 M HCl medium, the highest level of inhibition was obtained at 500 ppm and attained 89.0% in weight loss measurement, 93.5% in potentiodynamic polarisation, and 91.7% in electrochemical impedance spectroscopy, indicating that the extract effectively inhibits corrosion under the tested conditions. The inhibition mechanism involved physical adsorption on metal surfaces according to the Langmuir model, which enhances the corrosion inhibiting ability. Electrochemical and surface analysis techniques, such as Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM), confirmed that the extract creates a protective layer that effectively inhibits corrosion, where the steel’s average roughness decreased from Ra = 689 nm to Ra = 93.8 nm at the optimal inhibitor concentration. These findings show that the extract has strong anticorrosive properties.