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<p>The corrosion inhibition performance of <i>Calendula palaestina</i> methanolic extract (CPME) on copper in 1.0&#xa0;M HNO₃ was investigated using gravimetric, electrochemical, and microscopic techniques. CPME was evaluated over a concentration range of 50–400&#xa0;ppm. The chemical constituents of CPME were characterized using LC–MS/MS analysis. Results from the applied methods confirmed that CPME acts as an effective corrosion inhibitor within the examined concentration range. The inhibition efficiency was found to increase with rising temperature. Potentiodynamic polarization revealed that CPME behaves as a mixed-type inhibitor, influencing both cathodic and anodic reactions. Electrochemical impedance spectroscopy (EIS) indicated a decrease in double-layer capacitance and a corresponding increase in charge-transfer resistance with increasing inhibitor concentration, signifying enhanced inhibition efficiency. Thermodynamic parameters, including the free energy of adsorption, were evaluated, and the adsorption process was shown to follow the Langmuir isotherm model.</p> Graphical Abstract <p></p>

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Calendula Palaestina Extract as Green Corrosion Inhibitor for Copper in Acidic Solution

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Mahmoud A. Al-Qudah,
  • Abdulrahman G. Alhamzani,
  • Sahar H. AL-Qalalwah,
  • Yousef Al-Dalahmeh

摘要

The corrosion inhibition performance of Calendula palaestina methanolic extract (CPME) on copper in 1.0 M HNO₃ was investigated using gravimetric, electrochemical, and microscopic techniques. CPME was evaluated over a concentration range of 50–400 ppm. The chemical constituents of CPME were characterized using LC–MS/MS analysis. Results from the applied methods confirmed that CPME acts as an effective corrosion inhibitor within the examined concentration range. The inhibition efficiency was found to increase with rising temperature. Potentiodynamic polarization revealed that CPME behaves as a mixed-type inhibitor, influencing both cathodic and anodic reactions. Electrochemical impedance spectroscopy (EIS) indicated a decrease in double-layer capacitance and a corresponding increase in charge-transfer resistance with increasing inhibitor concentration, signifying enhanced inhibition efficiency. Thermodynamic parameters, including the free energy of adsorption, were evaluated, and the adsorption process was shown to follow the Langmuir isotherm model.

Graphical Abstract