Application of natural organic inhibitors derived from plant wastes for the prevention of metal corrosion

Abstract

The use of synthetic corrosion inhibitors in industrial processes often raises concerns related to toxicity, environmental pollution, and high costs. In contrast, natural organic compounds extracted from agricultural and plant wastes offer a sustainable, biodegradable, and cost-effective alternative. This study explores the corrosion inhibition potential of bio-extracts obtained from plant residues such as pomegranate peel, walnut shell, and green tea leaves on mild steel surfaces in acidic environments. The effectiveness of these natural inhibitors is attributed to their rich content of polyphenols, flavonoids, and tannins, which can adsorb onto metal surfaces through π-electron interactions and lone pair coordination. Experimental results demonstrated significant reductions in corrosion rate and improved surface protection. The findings support the application of natural organic inhibitors as a green chemistry solution for sustainable industrial corrosion control.