Corrosion Inhibition and Adsorption Characteristics for Mild steel by Extract of Kyllinga Erecta Plant in Acidic Medium

Titilayo Ige Jesusina, Adetola Abiola AJAYI

Abstract


The effectiveness of an ethanolic extract from Kyllinga erecta plant (KEP) as a Plant-derived corrosion inhibitor for mild steel in 0.5 M HCl was examined via the gravimetric analysis method across 298–318 K. KEPE markedly decreased the Surface degradation rate while enhancing the Inhibitory performance and concentration decrease in temperature. At 7 g/L, inhibition reached ~88 % at 303 K and 63 % at 318 K, demonstrating strong protective capability. Thermodynamic analysis, based on the Langmuir adsorption isotherm, provided insights into adsorption behavior. The calculated Gibbs free energy of adsorption (ΔG°ads), activation energy (Eₐ), and heat of adsorption (Qads) confirmed a physisorption mechanism, implying electrostatic bonding between Kyllinga erecta plant extract and the metal interface. This protective barrier efficiently resists acid-induced metal deterioration. Phytochemical analysis identified bioactive compounds such as tanins, steroids, essential oil, flavonoids and chalcones, which contribute to corrosion inhibition. These compounds contain electron-donating functional groups that enhance adsorption and film formation. The eco-friendly, highly efficient, and readily available nature of Kyllinga erecta plant makes it a promising alternative to synthetic inhibitors, which often pose environmental and health risks.


Keywords


Kyllinga erecta, Mild Steel, Gravimetry measurement, Langmuir Adsorption Isotherm.

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DOI: http://dx.doi.org/10.52155/ijpsat.v49.1.7008

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