Corrosion Inhibition of α-brass Alloy in Aqueous Solution by Using Expired Ranitidine
A. S. Fouda, S. Rashwaan, Hoyeda E. Ibrahim, Rana Ahmed
Abstract
Expired Ranitidine was tested as a corrosion hindrance for α-brass . The result is utilized to identify its maximum concentration in order to be used in the protection of corrosion of α-brass in a HCl medium. The inhibitive action of Ranitidine is determined using mass loss (ML), potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) tests. The efficiency of this Ranitidine depends on both concentration and temperature. The values of Gibbs free energy (ΔG o ads ) (39 kJ mol -1 ) indicated that ER is adsorbed on α-brass surface physico-chemically. The results indicate that Ranitidine exhibits excellent corrosion inhibition at 300 ppm and the inhibition effectiveness reached to 90%. The polarization data indicated that the tested Ranitidine affects both cathodic and anodic reactions (mixed kind). The Ranitidine is adsorbing on α-brass surface following Langmuir adsorption isotherm. The surface morphology of α-brass samples is analyzed.