Investigation of caffeic acid as an inhibitor for aluminum-silicon alloy corrosion

Document Type : Original Article

Author

Department of Basic Science, Faculty of Engineering, Benha University, Benha, Egypt

Abstract

Caffeic acid was investigated as an inhibitor for aluminum-silicon alloy corrosion in 1.0 M solution of hydrochloric acid.
Weight loss, Tafel polarization, and impedance spectroscopy techniques were used in the study. The data showed that caffeic
acid act as an excellent inhibitor for acid corrosion of the aluminum alloy. The inhibition efficiency was found to be increased
with its concentration but decreases with increasing temperature. The inhibition process was attributed to adsorption of the
inhibitor molecules on the alloy surface. The adsorption is physical in nature and follows Langmuir adsorption isotherm.
Thermodynamic functions of the corrosion reaction were determined and discussed

Keywords

Journal of Basic and Environmental Sciences
Volume 6, Issue 4
October 2019
Pages 289-294

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