TY  - JOUR
AU  - Adebayo, Matthew A.
AU  - Odewale, O’Seun
AU  - Ajayi, Olabisi A.
PY  - 2026
DA  - 2026/06/29
TI  - Utilising Ethanol Extract of the Leaves of African Peach for Corrosion Protection of Mild Steel in 1.0 M NaOH: Electrochemical and Gravimetric Assessments
JO  - Recent Progress in Science and Engineering
SP  - 012
VL  - 02
IS  - 02
AB  - Mild steel has tendency to form a protective film in caustic environments; however, elevated temperatures and freshly exposed metal surfaces usually prevent stable film formation—leading to rapid and active corrosion rate of mild steel. This study reports the potential of using ethanol extract of African peach leaf as alternative corrosion inhibitor of mild steel in 1.0 M NaOH solution. Gravimetric and electrochemical measurements were carried to unravel the mechanisms of the corrosion reduction by the inhibitor while scanning electron microscopy (SEM)-energy dispersive X-ray (EDX) spectroscopy were used to visualised the surface structure and relative elemental composition of the mild steel after immersion in inhibited (1.0 M NaOH + inhibitor) and uninhibited (1.0 M NaOH) solutions. Equilibrium data were subjected to Langmuir, Freundlich and Temkin models while the temperature-dependent data were analysed using appropriate thermodynamic equations. Corrosion rate exhibited a marginal decline with increasing inhibitor concentration, whereas the inhibition efficiency demonstrated a substantial enhancement. Variations in experimental temperature had a minimal effect on the inhibition efficiency of the inhibitor in protecting mild steel surface. The equilibrium data obeyeda the Langmuir isotherm model. The adsorption of the inhibitor onto the mild steel surface was spontaneous, involving a mixed adsorption mechanism (comprising both physisorption and chemisorption) and was endothermic. The observed reduction in corrosion current density (Icorr) and the corresponding increase in inhibition efficiency from polarization measurements, alongside the enhanced charge transfer resistance (Rct) derived from electrochemical impedance spectroscopy (EIS), collectively confirm the effective corrosion inhibition performance of the African peach extract. Hence, Nauclea latifolia leaf extract serves as a viable and eco-friendly corrosion inhibitor for mild steel in alkaline environments.
SN  - 3067-4573
UR  - https://doi.org/10.21926/rpse.2602012
DO  - 10.21926/rpse.2602012
ID  - Adebayo2026
ER  -