Inhibition of Aluminum Corrosion in Acid Medium by Cassia Acutifolia Extract | ||||
| Journal of Basic and Environmental Sciences | ||||
| Volume 3, Issue 2, April 2016, Page 37-46 PDF (178.86 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jbes.2016.369599 | ||||
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| Authors | ||||
| A. Y. El-Etre1; M.A. El Komy2; Shahera M. Shohayeb2; S. Abdelhamed2 | ||||
| 1Chemistry department, Faculty of Science, Benha University, Benha, Egypt | ||||
| 2Faculty of engineering, Benha University, Benha, Egypt | ||||
| Abstract | ||||
| The inhibitive effect of aqueous extract of Cassia acutifolia leaves toward the corrosion of aluminum in 1 MHCl solution has been investigated by weight loss measurements, galvanostatic, potentiodynamic anodic polarization techniques and electrochemical impedance spectroscopy technique. It was found that Cassia acutifolia extract act as a good inhibitor for aluminum corrosion in the acid solution. The inhibition action of the extract it was discussed in view of the adsorption of its components on aluminum surface. It was found also that the adsorption is a spontaneous process and follows Langmuir adsorption isotherm. The inhibition efficiency (%IE) increase as the extract concentration increased. Moreover, the effect of temperature on the (%IE) was studied. The (%IE) decrease with increased the temperature. It was found that the presence of extract increases the activation energy of the corrosion reaction. Moreover, the thermodynamic parameters of adsorption process were calculated. It was found also that the extract provides a good protection to aluminum against pitting corrosion in chloride ion containing solutions. | ||||
| Keywords | ||||
| Corrosion; Weight loss; Electrochemical techniques; Adsorption | ||||
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