Electrochemical Study by using Candesartan Drug as Green Corrosion Inhibitor of Aluminum Alloy in 1M HCl Medium
The candesartan as a pharmaceutical drug compound was used as a corrosion inhibitor for Aluminum. Many techniques are utilized for the corrosion of the Aluminumin 1 M HCl such as weight loss (WL), open circuit (EOCP), potentiodynamic polarization (PP) techniques, electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), and surface examination (SEM, EDX, and AFM) that used to analyze the surface of the metal before and after adsorption processes. WL is investigated at various temperatures between (25 – 45oC) but all electrochemical studies at room temperature. The inhibition efficiency (% IE) increased with increasing concentration of the Candesartan drug. The activation and adsorption parameters were calculated and illustrate the nature of the adsorption of candesartan drug on the metal surface. The adsorption of the Candesartan on Aluminum surface was find to obey with Langmuir adsorption model. The morphology of inhibited Aluminum was analyzed by the energy-dispersive X-ray spectroscope (EDX), atomic force microscopy (AFM), and scanning electron microscope (SEM). All techniques utilized to examine the corrosion inhibition by using the drug and confirm the formation thin layer or thin film adsorbed on the metal surface and prevent the corrosion processes. Polarization data revealed that this drug affects both anodic and cathodic reactions.From all techniques, give suggested the mechanism that illustrates the adsorption processes.
