The ability of Vildagliptin (VDG) to retard mild steel (MS) corrosion in 1 M HCl was studied by experimental methods like; weight loss (WL), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). Scanning electron microscopy (SEM) analyses was utilized for the surface morphological study. Increased VDG concentration and reduced temperature enhanced its efficiency. At 303 K, measurements by WL, PDP and EIS showed maximum inhibition efficiencies of 97.5%, 96.4% and 94.5% respectively. Data from EIS study demonstrated that increasing VDG concentration improved charge transfer resistance while reducing the capacitance, indicating protective film development on the MS surface. PDP results revealed the mixed inhibitor type of VDG. SEM analysis validates that VDG inhibition ability is due to adsorption resulting to the formation of protective film over the metal surface. Theoretical study by density functional theory (DFT) helped in interpreting the inhibitive performance of VDG.
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