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2000
Volume 18, Issue 3
  • ISSN: 2405-5204
  • E-ISSN: 2405-5212

Abstract

Background

This study investigates the potential of essential oil (LNEO) as a corrosion inhibitor for steel in a 1 M hydrochloric acid (HCl) solution.

Materials and Methods

Gas Chromatography-Mass Spectrometry (GC-MS) analysis was performed to determine the chemical composition of LNEO, revealing key constituents, including 1.8-cineole (33.47%), α-terpinyl acetate (17.39%), and sabinene (9.18%). Corrosion inhibition efficiency was evaluated through electrochemical techniques, and adsorption behavior was analyzed using the Langmuir isotherm model. Thermodynamic parameters were also assessed to elucidate the adsorption mechanism.

Results

The inhibition efficiency reached a maximum of approximately 93.4% at an optimal concentration of 2 g/l. Langmuir adsorption isotherm studies confirmed a strong interaction between LNEO and the steel surface, with an adsorption free energy (ΔG = -21.2 kJ/mol) and an adsorption equilibrium constant (K = 5.21 L/g), indicating a physisorption mechanism with partial charge transfer. Thermodynamic analyses showed an activation energy (E = 44.7 kJ/mol), enthalpy change (ΔH = 42.1 kJ/mol), and entropy change (ΔS = -69.3 J/mol.K), supporting a spontaneous and endothermic adsorption process.

Discussion

Density Functional Theory (DFT) calculations and Scanning Electron Microscopy (SEM) analyses confirmed the adsorption mechanism, highlighting the protective film formation on the steel surface.

Conclusion

These findings demonstrate that essential oil is an effective corrosion inhibitor for steel in acidic media, with strong adsorption properties and high inhibitory efficiency.

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/content/journals/rice/10.2174/0124055204380442250418183412
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Evaluation of Laurus nobilis Essential Oil as a Corrosion Inhibitor for Mild Steel in HCl: Electrochemical Measurements and DFT Analysis
Recent Innovations in Chemical Engineering 18, 194 (2025); https://doi.org/10.2174/0124055204380442250418183412
/content/journals/rice/10.2174/0124055204380442250418183412
/content/journals/rice/10.2174/0124055204380442250418183412
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  • Article Type:     Research Article
Keyword(s): corrosion inhibition; DFT analysis; essential oil; high inhibitory efficiency; Laurus nobilis; Mild steel

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