Research
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.
Electrochemical Behavior of Quenching low Carbon Steel (LCH) By Using Simvastatin Drug as a Corrosion Protection in 0.5 H2SO4 Medium by Applied: Potentiodynamic and Evans Techniques
The rule of this paper is to study a possibility of using Simvastatin pharmaceutical drug compound as corrosion inhibitor that can have a decisive effect of decreasing on metallic corrosion rate and adsorbed on the metal surface by using potentiodynamic polarization and Evans techniques. In this regard, we simultaneously present an overview on Simvastatin compound performance, as corrosion inhibitor in 10% ethanol, 0.5N H2SO4 (10A5H), and with presence different concentration of drug. The potentiodynamic polarization and Evans technique are studied the LCH in different medium to clarify the effect of medium on the corrosion processes and the effect of polarization on the orientation of inhibitor molecule to the metal surface. The surface examination by scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and atomic force microscopy (AFM). All surface examinations confirm formation, thin film adsorbed on the metal surface which discussed by the mechanism of the adsorption processes on the polarized metal surface.
