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<p>The corrosion inhibition of carbon steel (CS) immersed in 1&#xa0;N HCl was assessed using a weight loss method with an aqueous extract from Baccaurearamiflora leaves. Potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS) were employed to explore the mechanisms behind the inhibition. Results indicate that higher doses of the inhibitor reduce corrosion rates and increase inhibition efficiency. The active components of the extract adhere to the metal surface, achieving a maximum inhibition effectiveness of 96.40%. The PDP method demonstrated the inhibitor’s ability to control both anodic and cathodic processes. The presence of the inhibitor the LPR value increases from 39.0 to 144.9 Ω·cm², and decreases in corrosion current from 6.131 × 10<sup>4</sup> to 1.349 × 10<sup>2</sup> A/cm². Charge transfer resistance (R<sub>t</sub>) increases between 24.4 and 54.5 Ω·cm², while double layer capacitance (C<sub>dl</sub>) decreased from 14.5 × 10⁻⁶ F/cm² to 2.8 × 10⁻⁶. The impedance logarithm value (/ohm) remained consistent between 0.30 and 0.92, and the phase angle adjusted from 27.0 to 42.9 degrees. SEM and AFM confirm the inhibitor prevents rust in HCl pickling.</p>

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Investigation of Baccaurea Ramiflora Leaf Extract as Sustainable Corrosion Inhibitor for Carbon Steel in Acidic Medium

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • R. Banumathi,
  • S. S. Syed Abuthahir,
  • H. Mohamed Kasim Sheit,
  • K. S. Mohan,
  • S. Berbeth Mary

摘要

The corrosion inhibition of carbon steel (CS) immersed in 1 N HCl was assessed using a weight loss method with an aqueous extract from Baccaurearamiflora leaves. Potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS) were employed to explore the mechanisms behind the inhibition. Results indicate that higher doses of the inhibitor reduce corrosion rates and increase inhibition efficiency. The active components of the extract adhere to the metal surface, achieving a maximum inhibition effectiveness of 96.40%. The PDP method demonstrated the inhibitor’s ability to control both anodic and cathodic processes. The presence of the inhibitor the LPR value increases from 39.0 to 144.9 Ω·cm², and decreases in corrosion current from 6.131 × 104 to 1.349 × 102 A/cm². Charge transfer resistance (Rt) increases between 24.4 and 54.5 Ω·cm², while double layer capacitance (Cdl) decreased from 14.5 × 10⁻⁶ F/cm² to 2.8 × 10⁻⁶. The impedance logarithm value (/ohm) remained consistent between 0.30 and 0.92, and the phase angle adjusted from 27.0 to 42.9 degrees. SEM and AFM confirm the inhibitor prevents rust in HCl pickling.