Spices : An Eco-friendly Corrosion Inhibitor for Aluminium

Corrosion is a naturally occurring phenomenon commonly defined as the deterioration of a metal that results from a chemical or electrochemical reaction with its environment. Generally, metal gets corroded in presence of acids, alkali, sulphides and salts. To combat corrosion of metal in acidic environment, use of inhibitors is the most practical approach. In spite of the fact that the synthetic organic compounds shows good inhibitive properties, their usage is still undesired due to their adverse effects on human beings, environment, as well as high costs. In the recent years, there has been an increasing awareness of environment and green chemistry. The present study is focused to observe the inhibitive effect of spice on Al. The inhibitive and adsorption characteristics of the extract were estimated using gravimetric measurements and electrochemical impedance techniques. Quantum chemical calculations using the Density Functional Theory (DFT) was carried on the major components of the extract in order to understand their importance in the corrosion inhibition of Aluminium.