Inhibitive and Adsorption Properties of Ethanolic Extract of Allium Cepa for the Corrosion of -?Brass in HNO3 Solutions

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Fouda, Abd El-Aziz S. ; Nofal, Ashraf M. ; Maher, Reham (2015)
  • Publisher: Journal of Engineering Computers & Applied Sciences
  • Journal: Journal of Engineering Computers & Applied Sciences (issn: 2319-5606)
  • Subject: Applied Sciences | Corrosion inhibition; ?-brass; allium cepa extract; EIS; EFM, HNO3

Ethanol extract of allium cepa has been evaluated as a green corrosion inhibitor for ?-brass in HNO3 solutions using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Potentiodynamic polarization measurements showed that this extract acts as a mixed type inhibitor. The inhibition efficiency increases with increasing the extract concentration, but decreases with raising the temperature. The adsorption of allium cepa on the ?-brass surface follows Temkin adsorption isotherm. From EFM the causality factors are very close to theoretical values which indicate that the measured data are of good quality. Nyquist plots show a single capacitive loop in uninhibited and inhibited solutions. Allium cepa has antifaugal and antibacterial effect.
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