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Investigation of caffeic acid as an inhibitor for aluminum-silicon alloy corrosion
J. Bas. & Environ.Sci. • 2019
Publication Information
Authors
Mona El-Etre
Keywords
Aluminum-silicon alloy, acid corrosion, natural corrosion inhibitor
Journal
J. Bas. & Environ.Sci.
Publisher
BSW
Volume
6
Issue
4
Pages
289-294
publication.type
International
Paper Link
Open Link
Supplementary Materials
Not Available
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.
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.