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<p><i>Ziziphus lotus plant</i>, a widely distributed wild species with long-standing traditional uses, was examined for its potential as a sustainable corrosion inhibitor for C38 carbon steel exposed to 1&#xa0;M HCl. The inhibitory performance of the oil extract was assessed using hydrogen evolution measurements, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) over a range of concentrations (up to 4&#xa0;g/L) and temperatures (293–323&#xa0;K). The extract exhibited a slight improvement in efficiency with increasing temperature, reaching a maximum protection of 98.3% at 4&#xa0;g/L. EIS analysis indicated the formation of a protective surface layer, reflected by a rise in charge transfer resistance (Rct) and a reduction in double-layer capacitance (Cdl). Although classical adsorption isotherms did not accurately describe the adsorption behavior, thermodynamic parameters supported a chemisorption-driven interaction between the extract components and the metal surface. Polarization curves further showed that the extract behaved as a mixed-type inhibitor, with a stronger influence on the cathodic reaction. Overall, these findings highlight&#xa0;<i>Ziziphus lotus</i>&#xa0;oil as a promising eco-friendly alternative for corrosion mitigation in acidic environments.</p>

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Sustainable corrosion inhibition of C38 steel in 1M HCl using Ziziphus lotus oil extract: performance, mechanism and environmental benefits

  • 期刊论文

  • 发表日期：

    2025年12月16日

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  • Mounia El Motaouakkel,
  • Aimad Mazkour,
  • Walid Belmaghraoui,
  • Mohamed Hatim Labiad,
  • Mourad Harir,
  • Souad El Hajjaji

摘要

Ziziphus lotus plant, a widely distributed wild species with long-standing traditional uses, was examined for its potential as a sustainable corrosion inhibitor for C38 carbon steel exposed to 1 M HCl. The inhibitory performance of the oil extract was assessed using hydrogen evolution measurements, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) over a range of concentrations (up to 4 g/L) and temperatures (293–323 K). The extract exhibited a slight improvement in efficiency with increasing temperature, reaching a maximum protection of 98.3% at 4 g/L. EIS analysis indicated the formation of a protective surface layer, reflected by a rise in charge transfer resistance (Rct) and a reduction in double-layer capacitance (Cdl). Although classical adsorption isotherms did not accurately describe the adsorption behavior, thermodynamic parameters supported a chemisorption-driven interaction between the extract components and the metal surface. Polarization curves further showed that the extract behaved as a mixed-type inhibitor, with a stronger influence on the cathodic reaction. Overall, these findings highlight Ziziphus lotus oil as a promising eco-friendly alternative for corrosion mitigation in acidic environments.