Adsorption and inhibitive properties of methanol extract of Eeuphorbia Heterophylla for the corrosion of copper in 0.5 M nitric acid solutions

The adsorption and the inhibitive properties of methanol extract of Euphorbia heterophylla on copper in 0.5 M HNO have been studied by weight loss method at different temperatures (30-50°C), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modu...

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Bibliographic Details
Published in:Polish journal of chemical technology 2017-03, Vol.19 (1), p.95-103
Main Authors: Fouda, A. S., Elmorsi, M. A., Abou-Elmagd, B. S.
Format: Article
Language:English
Subjects:
acid corrosion
Adsorption
Copper
Electrochemical impedance spectroscopy
Electrode polarization
Free energy
Frequency modulation
green inhibitor
kinetic parameters
Methanol
Nitric acid
Scanning electron microscopy
Weight loss
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Summary:The adsorption and the inhibitive properties of methanol extract of Euphorbia heterophylla on copper in 0.5 M HNO have been studied by weight loss method at different temperatures (30-50°C), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Also, the surface morphology was analyzed by scanning electron microscopy (SEM). It was found that the inhibition efficiency increases with increasing extract doses and decreased with increasing temperature. The polarization data revealed that this extract acts as mixed type inhibitor. The adsorption process was more favored at lower temperatures with larger negative standard free energy. The extract was adsorbed physically on the copper surface followed Frumkin isotherm.
ISSN:1899-4741
1509-8117
1899-4741
DOI:10.1515/pjct-2017-0014