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<p>Steel corrosion is effectively protected using plant-based inhibitors. However, organic inhibitors like plant extracts often show limited performance in neutral environments. To overcome this limitation, this study investigated the corrosion behavior of a combined organic-inorganic inhibitor, consisting of <i>Lavandula angustifolia</i> (LA) plant extract and zinc nitrate, for low-carbon steel in a 3.5% NaCl solution. Electrochemical techniques, including EIS and PDP, along with surface characterization and theoretical modeling, were employed to assess the corrosion inhibition efficiency of this hybrid system. The i<sub>corr</sub> value for the LA–Zn²⁺ inhibitor at 400 ppm LA and 400 ppm Zn decreased from 11.51 to 0.83 µA/cm², corresponding to an inhibition efficiency of 92%, and showed better performance than the individual inhibitors. This finding was further supported by EIS measurements, where the R<sub>ct</sub> increased from 862 to 5956 Ω&#xa0;cm². This indicated the formation of a highly protective interfacial layer. FTIR and UV-vis spectroscopy confirmed the interaction between LA’s functional groups and Zn²⁺ ions. CA measurements (19.7° for the blank and 40.12° for the optimal sample) and SEM/EDS analyses further validated the formation of protective surface layers. Additionally, MC, MD, and QM simulations revealed the strong binding affinity and stability of the LA–Zn²⁺ complexes, offering insights into their protective behavior. This study presents LA–Zn²⁺ complexes as eco-friendly, efficient alternatives to traditional corrosion inhibitors.</p>

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Experimental and computational study of corrosion protection of carbon steel by Lavandula angustifolia extract–Zn(II) hybrid system in saline solution

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月17日

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  • Roshana Sattari,
  • Gholam Reza Khayati,
  • Esmaeel Darezereshki

摘要

Steel corrosion is effectively protected using plant-based inhibitors. However, organic inhibitors like plant extracts often show limited performance in neutral environments. To overcome this limitation, this study investigated the corrosion behavior of a combined organic-inorganic inhibitor, consisting of Lavandula angustifolia (LA) plant extract and zinc nitrate, for low-carbon steel in a 3.5% NaCl solution. Electrochemical techniques, including EIS and PDP, along with surface characterization and theoretical modeling, were employed to assess the corrosion inhibition efficiency of this hybrid system. The icorr value for the LA–Zn²⁺ inhibitor at 400 ppm LA and 400 ppm Zn decreased from 11.51 to 0.83 µA/cm², corresponding to an inhibition efficiency of 92%, and showed better performance than the individual inhibitors. This finding was further supported by EIS measurements, where the Rct increased from 862 to 5956 Ω cm². This indicated the formation of a highly protective interfacial layer. FTIR and UV-vis spectroscopy confirmed the interaction between LA’s functional groups and Zn²⁺ ions. CA measurements (19.7° for the blank and 40.12° for the optimal sample) and SEM/EDS analyses further validated the formation of protective surface layers. Additionally, MC, MD, and QM simulations revealed the strong binding affinity and stability of the LA–Zn²⁺ complexes, offering insights into their protective behavior. This study presents LA–Zn²⁺ complexes as eco-friendly, efficient alternatives to traditional corrosion inhibitors.