Abstract
In this study, we explored aluminum corrosion inhibition field of study in a 1 M HCl solution, harnessing the power of essential oils extracted from rosemary and eucalyptus plants. Our exploration gives a comprehensive analysis of the pivotal factors that shape the corrosion inhibition process. Our scientific journey was marked by a deliberate and systematic approach, encompassing the utilization of gravimetric analysis (weight loss), electrochemical potentiodynamic polarization, and the sophisticated electrochemical impedance spectrometry (EIS) techniques. Our findings unveiled promising and nuanced outcomes, particularly in the area of the electrochemical technique. This method demonstrated remarkable inhibition efficiencies, ranging from 42% to an impressive 92% for rosemary essential oil and from 37 to 84% for eucalyptus essential oil. These results unveiled a dynamic relationship between essential oil concentration and inhibition efficiency, a revelation that further deepens our understanding of the corrosion inhibition process. The inhibition efficiency increased with higher concentrations of essential oil but decreased with elevated temperatures. Furthermore, our analysis traversed into the realms of potentiodynamic and thermodynamic insights. These analytical techniques unearthed the complex mechanisms at play, explaining the pathway followed by the studied inhibitors. They exhibited their prowess by forming protective films on the metal surface, acting as vigilant protectors against the relentless forces of corrosion. Complementing our experimental findings, our study of computational chemistry through density functional theory (DFT) unveiled remarkable insights. It elucidated the spontaneous adsorption process of inhibitor molecules onto the aluminum surface in the presence of H2O solvent. This computational harmony with our experimental results strengthened our confidence in the robustness of our findings. One of the key findings of this study was the superior inhibitory power of camphor in rosemary EO and β-myrcene in eucalyptus essential oil EO, respectively, attributed to the distinctive characteristics of the active sites found in each compound. The inhibitory effectiveness followed the order β-myrcene > camphor > borneol > α-pinene > bornyl acetate > p-cymene > 1,8-cineole. These compounds, notable for their distinct active sites, emerged as exceptional agents in the pursuit of effective corrosion inhibition.
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The data sets used and/or analyzed during this study are available from the corresponding author upon reasonable request.
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This work is the result of collaboration among all authors. Fathia Laihemdi: conceptualization, data collection, and writing original draft; Ali Barhoumi: conceptualization, draw figures, writing, methodology, and investigation. Meryem Zarri: conceptualization, draw figures, methodology, and investigation. Mohamed Tahiri: formal analysis and validation. Mohammed Chafi: methodology, formal analysis, writing, validation, review, and editing. All authors approved the final manuscript.
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Laihemdi, F., Barhoumi, A., Zarri, M. et al. Inhibition of corrosion of an aluminum alloy by rosemary and eucalyptus extracted oils in 1 M hydrochloric acid medium: an experimental and theoretical study. Environ Sci Pollut Res (2023). https://doi.org/10.1007/s11356-023-30800-5
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DOI: https://doi.org/10.1007/s11356-023-30800-5