Yellow Oleander Extract as Green Sustainable Corrosion Inhibitor for Aluminum in Hydrochloric Acid Solution

Through this study, the use of yellow oleander extract (YOE) as an environmentally friendly and sustainable corrosion inhibitor for Al in 1 M HCl solution was investigated by "mass loss (ML)" method, electrochemical frequency modulation (EFM), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) techniques". The surface analysis of Al has also been studied using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopic (EDX) and atomic force microscopy (AFM) techniques. The obvious impact of temperature on corrosion, with and without YOE was explored inside the temperature assortments of 25oC till 45 ºC by using ML procedure. PDP data revealed that YOE is considered mixed type inhibitor. Inhibition efficiency (% IE) increases as YOE improves and decreases as temperature increases. The adsorption of YOE on the Al surface follows the Langmuir adsorption isotherm and is considered a physical adsorption. Results obtained using chemical and electrochemical strategies are in good agreement.