What question did this study set out to answer?

To investigate the corrosion inhibition efficiency of orange peel extract in mild steel within acidic conditions.

February 21, 2026Discover Chemistry.Open Access

Thermodynamic study and adsorption characteristics of mild steel corrosion inhibition in 0. 1 M H₂SO₄ solution by orange peels (Citrus sinensis)

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Investigates orange peel extract's effectiveness as a corrosion inhibitor in mild steel, suggesting eco-friendly solutions for industrial challenges.

To investigate the corrosion inhibition efficiency of orange peel extract in mild steel within acidic conditions.
Utilized the hydrogen evolution method to evaluate inhibition efficiency and corrosion rate.
Computed thermodynamic parameters, including activation energy and enthalpy change.
Applied Langmuir, Freundlich, and Temkin isotherms for adsorption analysis.
Conducted surface characterization using atomic force microscopy (AFM) and scanning electron microscopy (SEM).
Achieved a maximum inhibition efficiency of 92.9% at 4.0 g/L concentration of orange peel extract.
Higher activation energy in the inhibited system compared to unrestrained systems indicates a stronger resistance to corrosion.
Determined that the adsorption process is spontaneous and primarily physical, supported by a negative Gibbs free energy.
Langmuir isotherm provided the best fit, indicating monolayer adsorption on a homogeneous surface.

Abeng et al. (2026) studied this question.

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Investigates orange peel extract's effectiveness as a corrosion inhibitor in mild steel, suggesting eco-friendly solutions for industrial challenges.