Corrosion Studies of Mild Steel (MS) in 3 M HCl Solution in the Presence of Expired Perindopril Drug: Mitigation of MS Corrosion by Green Corrosion Inhibitor

Abstract

This original article emphasizes the mitigation of MS corrosion in 3 M HCl solution by expired perindopril drug. The weight loss (mass loss) and electrochemical (Tafel plot and impedance plots) techniques were employed for the MS corrosion inhibition studies. Weight loss technique results show that, MS corrosion in 3 M HCl solution can be prevented with the inhibitor concentration (expired perindopril drug concentration) and solution temperature dependent mode. The Tafel plot results show that, the expired perindopril drug acts as mixed type corrosion inhibitor for MS in 3 M HCl solution. The Nyquist plots in the absence and presence of the corrosion inhibitor confirms the adsorption of expired perindopril drug molecules on the MS surface in the 3 M HCl solution. The scanning electron microscopy (SEM) topography further supports the results of weight loss, Tafel plots and impedance spectroscopy results.