Inhibitory Action of Artemisia annua Extracts and Artemisinin on the Corrosion of Mild Steel in H2SO4 Solution

P. C. Okafor; V. E. Ebiekpe; C. F. Azike; G. E. Egbung; E. A. Brisibe; E. E. Ebenso

doi:10.1155/2012/768729

International Journal of Corrosion (Jan 2012)

Inhibitory Action of Artemisia annua Extracts and Artemisinin on the Corrosion of Mild Steel in H2SO4 Solution

P. C. Okafor,
V. E. Ebiekpe,
C. F. Azike,
G. E. Egbung,
E. A. Brisibe,
E. E. Ebenso

Affiliations

P. C. Okafor: Corrosion and Electrochemistry Research Group, Department of Pure and Applied Chemistry, University of Calabar, PMB 1115, Calabar, Nigeria
V. E. Ebiekpe: Corrosion and Electrochemistry Research Group, Department of Pure and Applied Chemistry, University of Calabar, PMB 1115, Calabar, Nigeria
C. F. Azike: Corrosion and Electrochemistry Research Group, Department of Pure and Applied Chemistry, University of Calabar, PMB 1115, Calabar, Nigeria
G. E. Egbung: Department of Biochemistry, University of Calabar, PMB 1115, Calabar, Nigeria
E. A. Brisibe: Department of Genetics and Biotechnology, University of Calabar, PMB 1115, Calabar, Nigeria
E. E. Ebenso: Department of Chemistry, North-West University, Mafikeng Campus, Private Bag X2046, Mmabatho 2735, South Africa

DOI: https://doi.org/10.1155/2012/768729
Journal volume & issue: Vol. 2012

Abstract

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The action of ethanol (EEAA), acid (AEAA), and toluene (TEAA) extracts from Artemisia annua and Artemisinin (ATS) on mild steel corrosion in H2SO4 solutions was investigated using gravimetric and gasometric techniques. The extracts and ATS functioned as good inhibitors, and their inhibition efficiencies (%IE) followed the trend: EEAA > AEAA > TEAA > ATS. %IE increased with increase in inhibitors concentration and decreased with increase in temperature. The enhanced %IE values of the extracts were attributed to synergistic effect of the components of the plant extracts with ATS. The adsorption of the inhibitors was consistent with Langmuir isotherm. Physisorption is proposed as the mechanism of inhibition.

Published in International Journal of Corrosion

ISSN: 1687-9325 (Print); 1687-9333 (Online)
Publisher: Wiley
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://onlinelibrary.wiley.com/journal/7572

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