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Unlocking the Potential of Cinnamaldehyde: A Comprehensive Study on Its Dual Role as an Effective Inhibitor Against Corrosion and Microbial Corrosion of Mild Steel in Saline Environments

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Abstract

In this investigation, the application of cinnamaldehyde (CIN) on carbon steel under aggressive saline conditions (3.5% w/w NaCl solution) at ambient temperature and pressure led to a substantial reduction in both microbial and electrochemical corrosion. CIN exhibited notable corrosion-inhibitory properties, with increased effectiveness at lower concentrations. While it demonstrated the highest efficiency in mitigating corrosion, its impact on microbial corrosion, specifically planktonic and sessile bacteria, showed a more moderate effect. The study underscores CIN's ability to effectively reduce carbon steel corrosion in a 3.5% w/w NaCl medium. Carbon steel specimens exposed to the NaCl medium, with and without inhibitors, underwent various tests, including assessments of open circuit potential, potentiodynamic polarization reactions, electrochemical impedance spectroscopy, and post-experiment surface characterization, supported by quantum chemical calculations. The optimal concentration for CIN was identified as 50 ppm, achieving an impressive inhibition capacity of 89.68%. The inhibition mechanism primarily involved the adsorption of CIN onto the metal surface. The findings indicated a strong affinity between CIN and the metal surface, favoring physical adsorption over chemical adsorption, correlating with a modest increase in inhibition efficiency. Notably, the open circuit potential shifted towards a positive potential, and polarization calculations indicated a reduction in both cathodic and anodic current densities, indicating the inhibitory effect. The measured inhibition efficiency, evaluated through potentiodynamic polarization and impedance spectroscopy, aligned with existing literature. Scanning electron microscopy provided visual evidence of an adsorbed protective layer of the inhibitor on the metal surface. Quantum chemical parameters were computed, supporting the conclusion that the inhibition of carbon steel by CIN, along with thiourea and sodium lauryl sulfate, operates through a chemical adsorption process.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, Damietta University, Damietta, 34517, Egypt

    Waleed M. Saad

  2. Electrochemistry and Corrosion Lab., Physical Chemistry Department, National Research Centre, El-Bohouth St. 33, Dokki, P.O. 12622, Giza, Egypt

    A. M. El-Shamy

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Contributions

Waleed M. Saad and A. M. El-Shamy significantly contributed to this study as follows: Experimental Design and Setup: Both authors played pivotal roles in designing the experimental framework for investigating the corrosion inhibition properties of cinnamaldehyde (CIN). They were responsible for setting up the carbon steel specimens in saline media and developing the test parameters. Data Collection and Analysis: Waleed M. Saad and A. M. El-Shamy were actively involved in the data collection process, which included assessments of open circuit potential, potentiodynamic polarization reactions, and electrochemical impedance spectroscopy. They conducted thorough analyses of the obtained data. Quantum Chemical Calculations: The authors were responsible for performing quantum chemical calculations and interpreting the results. They computed and elucidated various quantum chemical parameters to understand the interaction between CIN and the metal surface. Corrosion Inhibition Mechanism: Both authors contributed to the interpretation of the corrosion inhibition mechanism. They specifically highlighted the adsorption of CIN onto the metal surface as the primary mode of action. Results and Conclusion: Waleed M. Saad and A. M. El-Shamy were instrumental in deriving conclusions from the experimental findings. They emphasized the effectiveness of CIN as a corrosion inhibitor and its impact on microbial corrosion, particularly in relation to planktonic and sessile bacteria. Manuscript Preparation: Both authors participated in drafting and revising the research report. They ensured that the manuscript was well-structured and supported by the experimental data and calculations. Review and Final Approval: Waleed M. Saad and A. M. El-Shamy jointly reviewed the final manuscript to ensure its accuracy and completeness before submission. The collaborative efforts of these authors were crucial in conducting a comprehensive study on CIN's corrosion inhibition properties and its potential to reduce carbon steel corrosion in saline environments. Their work contributes to the understanding of the underlying mechanisms and offers insights for future applications in corrosion control.

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Correspondence to A. M. El-Shamy.

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Saad, W.M., El-Shamy, A.M. Unlocking the Potential of Cinnamaldehyde: A Comprehensive Study on Its Dual Role as an Effective Inhibitor Against Corrosion and Microbial Corrosion of Mild Steel in Saline Environments. J Bio Tribo Corros 10, 14 (2024). https://doi.org/10.1007/s40735-024-00817-5

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  • DOI: https://doi.org/10.1007/s40735-024-00817-5

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