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JJEM Thirteenth Issue - Volume 7 Number 1 -2022

Volume 7, Issue 1

Corrosion Inhibition Ability of Caffeine on Low Carbon Steel in Corrosive Acid Media: An Experimental and Quantum Chemical Study.

Published:    2023-08-10


A.M. Guruprasad, B.T. Ashwini


In a 0.1 M hydrochloric acid medium, a study of the corrosion fatigue behavior of low carbon steel (LC-Steel) under the influence of caffeine is carried out. Mass loss (ML) studies , potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) measurements were used in corrosion studies. A potentiodynamic polarization revealed that the inhibitor functions as a mixed inhibitor. Corrosion inhibition followed Langmuir's adsorption isotherm, which indicated at inhibitor adsorption on the LC-Steel surface. Decrease in double layer capacitance (Cdl) and increase in polarization resistance (Rp) along with the increment in Caffeine's concentration has resulted in appreciable inhibition efficiency. Which is well supported by reduced surface imperfections as, seen from SEM images. The geometrical quantum chemical parameters of inhibitor was explained by using theoretical PM6 semi-empirical method.


: Caffeine, Corrosion, Low Carbon Steel, Quantum calculation