Utilization of Expired Calcitriol as an Eco-friendly Corrosion Inhibitor on the Copper Metal in the Aerated Acidic Environment

Abstract

Corrosion inhibition mechanism of expired Calcitriol as a nontoxic corrosion inhibitor on the copper in the aerated 5 M HCl solution was thoroughly examined via weight loss (mass loss), Tafel plot (potentiodynamic polarization), AC impedance spectroscopy and surface topography techniques. Weight loss (mass loss) confirms the good corrosion protection efficiency of expired Calcitriol drug on the copper surface in 5 M HCl solution. Tafel plot study reveals the anodic type corrosion inhibition property of expired Calcitriol in the studied system. AC impedance spectroscopy and scanning electron microscopy (SEM) reveals the formation of an invisible compact layer on the copper electrode in 5 M HCl solution.