Journal
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
Volume 34, Issue 4, Pages 516-527Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01932691.2012.682008
Keywords
Aframomum melegueta; corrosion inhibition; inhibition efficiency; mild steel; molecular modeling
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Funding
- TWAS, the Academy of Sciences for the developing World, under the TWAS Grants for Research Units in Developing Countries Program [TWAS-RGA08-005]
- Education Trust Fund (ETF)
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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.
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