Studies on the corrosion inhibition properties of mimosa pudica on aluminium in alkaline medium

Abstract

In the present work, the effect of Mimosa pudica leaves extract on the corrosion of aluminium in 1N NaOH was studied using weight loss measurements and electrochemical techniques such as Tafel Polarization and Electrochemical Impedance Spectroscopy. A maximum inhibition efficiency of 78% is observed at 1.2g/L of inhibitor concentration which was found to be consistent across all the methods employed. The temperature dependency inhibitive properties of the selected inhibitor were studied in the range 303- 333K. The adsorption behavior of the inhibitor on the surface of aluminium was studied by fitting Langmuir adsorption isotherm and the nature of adsorption was found to be physisorption. Metallurgical microscopic analysis of the aluminium surface with and without the inhibitor further validated the results.