Exploring the Anti-Corrosive Action of Plantain Extract on AA6063 Aluminium in a Saline Environment Using Electrochemical Techniques

Abstract:

This study investigates plantain peduncle extract as a green corrosion inhibitor for AA6063 aluminium alloy in 1M NaCl using electrochemical techniques (OCP, LSV, Tafel analysis). Extract concentrations were tested at 30–50°C. Results showed concentration-dependent inhibition, with (0.3 ml) achieving maximum efficiency: 85.48% (30°C), 88.00% (40°C), and 89.92% (50°C). Tafel data confirmed reduced corrosion rates (0.18–0.13 mm/yr vs. control: 1.24–1.29 mm/yr) and increased polarization resistance (1.71–2.34 kΩ·cm² vs. control: 0.247 kΩ·cm²). OCP/LSV curves demonstrated cathodic potential shifts and suppressed current densities, indicating mixed-type inhibition. Langmuir isotherm analysis (R² > 0.994) confirmed monolayer adsorption, with ΔG_ads values (−64.32 kJ/mol at 30°C) suggesting chemisorption dominance. Optical micrographs revealed reduced corrosion with inhibitor concentration, though isolated pitting persisted. Empirical optimization (ANOVA) identified 0.144 ml at 30.1°C as optimal for minimal corrosion rate (0.21 mm/yr).

• Periodical: Key Engineering Materials (Volume 1036)
• Pages: 37-52
• DOI: https://doi.org/10.4028/p-RhuPW8
• Online since: December 2025
• Authors: Ojo S. I. Fayomi, Joshua O. Atiba, Onyeka G. Ogbuozobe*
• Keywords: AA6063, Aluminium Alloy, Corrosion, Inhibition, Optimization, Plantain Extract

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