article · Arabian Journal for Science and Engineering
Oregano leaf essential oil functions as an environmentally friendly corrosion inhibitor for carbon steel exposed to aggressive hydrochloric acid environments. Through electrochemical evaluations, surface morphology analysis, and weight loss measurements, the oil demonstrated notable protective capabilities against acid-induced metal degradation. At an optimal concentration of two grams per litre in one molar hydrochloric acid, the plant extract attained a maximum corrosion inhibition efficiency of 85.64 per cent. Thermodynamic assessments and Langmuir isotherm modelling revealed that the protective film forms through the development of rigid covalent bonds directly on the steel surface. In addition, computational analysis identified that the high level of inhibition performance stems primarily from the active presence of benzoyl rings and hydroxyl functional groups within the natural compounds.
Carbon steel is widely vulnerable to destructive acid damage during industrial processing, often requiring hazardous chemical treatments to protect it. Demonstrating that a plant-derived essential oil can substantially curb corrosion presents a cleaner, non-toxic alternative. Using biodegradable plant extracts could reduce dependence on synthetic chemicals, helping industries preserve critical metal equipment while lowering their environmental footprint.
This research demonstrates an early-stage laboratory finding for plant-based corrosion inhibitors aimed at safeguarding carbon steel in acidic settings. Potential beneficiaries include industrial facilities that utilise hydrochloric acid during cleaning or processing operations. Because the investigation relies on laboratory-scale chemical and computational tests, further applied testing in operational conditions and formulations would be required before commercial deployment is viable.
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Abstract In this study, Oregano ( Origanum vulgare ) leaf essential oil was studied as an environmental-friendly anticorrosion agent for carbon steel in aggressive hydrochloric acid. The corrosion inhibition of O. vulgare was characterized by surface morphology, electrochemical, weight loss, theoretical and computational methods. It was found that the highest inhibition performance of O. vulgare was 85.64% at 2 g/l in 1 M HCl. The results of Langmuir isotherm and adsorption thermodynamics investigation demonstrated that the O. vulgare inhibitor adsorbed on the metal surface by the formation of rigid covalent bonds. The adsorption and inhibition centers of the selected inhibitor were studied by the computational methods, resulting in that the hydroxyl functional groups and benzoyl rings are mainly responsible for the high inhibition efficiency.
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DOI: 10.1007/s13369-023-07693-0
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