Abstract
Amino acids and its Schiff bases have been widely recognized as green corrosion inhibitors primarily due to its non-toxic nature and biodegradable properties. Considering its unique nature and significant contribution in corrosion chemistry, studies were undertaken with an objective to find out the inhibitory effect of l-serine based Schiff base HHDMP on copper in 0.5, 1.0 and 1.5 M of sulphuric acid at 303, 308 and 313 K. Various techniques such as weight loss method, electrochemical impedance spectroscopy, potentiodynamic polarization (Tafel), basic computational calculations and adsorption studies were employed in the present investigations. Results revealed that Schiff base HHDMP do offer attractive inhibition efficiency in all concentrations of sulphuric acid. The inhibition effect advanced with the increased concentration of the inhibitor. However, with the increased concentration, the inhibition efficiency showed decline trend. Such behaviour of the amino acid Schiff base HHDMP on copper in sulphuric acid may be due to surface adsorption of the inhibitor molecules on the metal, which contributes to decrease in the double-layer capacitance and increase in the polarization resistance.
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