Evaluation of Banana-Derived Inhibitor for Corrosion Control in Mild Steel

This study investigates the effectiveness of banana peel extract as a corrosion inhibitor for A36 steel, addressing the need for sustainable solutions in infrastructure maintenance. Controlled corrosion exposure tests were conducted on steel plates treated with banana peel extract at varying concentrations (0%, 5%, 10%, and 15%). Surface characteristics were evaluated through scanning electron microscopy (SEM) and colorimetry. The pH and conductivity were monitored throughout the tests. The corrosion rate was determined using gravimetric characterization. Mechanical testing, including stress-strain behavior analysis, was performed using a universal testing machine. The results demonstrate that banana peel extract significantly enhances the corrosion resistance of A36 steel. Higher inhibitor concentrations, particularly at 15%, resulted in improved mechanical properties, such as ultimate stress, yield stress, modulus of elasticity, resilience, and toughness. SEM analysis revealed the formation of a protective chemisorbed layer, while colorimetry indicated better preservation of the steel's surface characteristics with increasing inhibitor concentration. Banana peel extract is a promising and sustainable alternative for corrosion protection in civil infrastructure. The effectiveness of the inhibitor increases with higher concentrations, providing robust protection against corrosion and enhancing the mechanical integrity of the steel. The utilization of agricultural waste as a functional corrosion inhibitor promotes circular economy principles. By repurposing banana peels, the study contributes to sustainable engineering practices and supports the achievement of the United Nations Sustainable Development Goals. This approach not only mitigates the environmental impact of traditional corrosion protection methods but also offers a viable, eco-friendly solution for extending the lifespan of steel structures.