Impedance Study of Coffee Waste as Eco-Friendly Inhibitor in Hybrid Sol-Gel Coating for Corrosion Mitigation of Mild Steel in NaCl

Abstract

The corrosion of mild steel poses significant challenges across industries due to structural degradation, safety risks and maintenance costs especially in saline environments. However, a recent study shows the drawbacks of conventional coatings which contain hazardous substance, therefore there is a need for developing an eco-friendly coatings alternative. The study utilized coffee waste contains polyphenols and caffeine which rich in natural antioxidants that offers corrosion-inhibitive properties and utilized hybrid sol-gel coatings formed by organic and inorganic compounds that known for their strong adhesion and barrier performance. This study investigates the coffee waste incorporation hybrid sol-gel coatings to enhance corrosion resistance of mild steel in 0.5 M NaCl solution.