Corrosion inhibiting effect of aframomum melegueta extracts and adsorption characteristics of the active constituents on mild steel in acidic media
Date
2013
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor & Francis Group, LLC
Abstract
The extract from the seeds of Aframomum melegueta (AM) was investigated as corrosion inhibitor for mild steel in aerated 1M HCl and 0.5M H2SO4 solutions using gravimetric and electrochemical techniques. AM extract was found to inhibit both the cathodic and anodic partial reactions of the corrosion process, via adsorption of the organic matter on the metal/solution interface, as described by the Langmuir as well as Flory-Huggins adsorption isotherms. Corrosion rates in all systems studied increased with rise in temperature. Increasing the temperature of the system enhanced inhibition efficiency of AM extract in 1M HCl, but decreased efficiency in 0.5M H2SO4. Molecular dynamics simulations were performed to theoretically illustrate the electronic structure and adsorption behaviour of the active constituents of the seeds of Aframomum melegueta; paradol (1-(4-Hydroxy-3-methoxyphenyl)decan-3-one) and shogaol ((E)-1-(4-Hydroxy-3- methoxyphenyl)dec-4-en-3-one) in order to theoretically evaluate their contributions to the corrosion inhibiting action of the extract.
Description
This article contains tables and figures
Keywords
Aframomum melegueta, corrosion inhibition, inhibition efficiency, mild steel, molecular modeling, Department of Chemistry
Citation
Oguzie, E. E., Iheabunike, Z. O., Oguzie, K. L., Ogukwe, C. E., Chidiebere, M. A., Enenebeaku, C. K. & Akalezi, C. O. (2013). Corrosion inhibiting effect of aframomum melegueta extracts and adsorption characteristics of the active constituents on mild steel in acidic media. Journal of Dispersion Science and Technology, 34, 516–527