Electroanalytical Studies on the Interaction Of l-Serine-Based Schiff Base, HHDMP, with Copper in Sulphuric Acid

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.

Protection of Aluminium Metal in 0.5 M HCl Environment by Mature Arecanut Seed Extracts: A Comparative Study by Chemical, Electrochemical and Surface Probe Screening Techniques

“…Plant inhibitors can be classified as an anodic or a cathodic type if the variation in the E corr values is more than 85 mV. 29,30 In the present case, the maximum shift in E corr were 22 mV (for EEMAS extract) and 78 mV (WEMAS extract), which implies that the inhibitors work through a mixed mode of inhibition by retarding both anodic dissolution and cathodic evolution reactions at active aluminium metal sites. In addition, increasing plant extract concentration in the examined solution did not notably modify either the anodic or cathodic Tafel slope values in any particular direction, indicating that the presence of inhibitors in test solution does not alter the corrosion process mechanism, but acts as an adsorption inhibitor which reduces the excessive metal dissolution in corrosive system.…”

A Comparative Study of Inhibitive Effects of Some New Schiff Bases on Copper Corrosion in Acidic Medium

“…Thiosemicarbazide, ethyl alcohol and hydrochloric acid were directly procured from Molychem India Limited. The BDHNPMTU and DHNPMHC were synthesized and characterized on the basis of reported various past research studies [32][33][34][35][36][37].…”

Interaction of two heterocyclic Schiff bases derived from 2-acetyl pyridine on mild steel in hydrochloric acid: Physicochemical and corrosion inhibition investigations

“…EIS measurements are were taken at constant potential in the frequency range from 1KHz to 100 mHz with amplitude of 10 mV as excitation signal [26][27][28] . The percentage of inhibition calculated by the following equation,…”