Inhibitory action of Phyllanthus amarus extracts on the corrosion of mild steel in acidic media

P. C. Okafor; M. E. Ikpi; I. E. Uwah; E. E. Ebenso; U. J. Ekpe; S. A. Umoren

doi:10.1016/j.corsci.2008.05.009

Inhibitory action of Phyllanthus amarus extracts on the corrosion of mild steel in acidic media

P. C. Okafor^*, M. E. Ikpi, I. E. Uwah, E. E. Ebenso, U. J. Ekpe, S. A. Umoren

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

513 Scopus citations

Abstract

The inhibitive action of leaves (LV), seeds (SD) and a combination of leaves and seeds (LVSD) extracts of Phyllanthus amarus on mild steel corrosion in HCl and H₂SO₄ solutions was studied using weight loss and gasometric techniques. The results indicate that the extracts functioned as a good inhibitor in both environments and inhibition efficiency increased with extracts concentration. Temperature studies revealed an increase in inhibition efficiency with rise in temperature and activation energies decreased in the presence of the extract. A mechanism of chemical adsorption of the plants components on the surface of the metal is proposed for the inhibition behaviour. The adsorption characteristics of the inhibitor were approximated by Temkin isotherm.

Original language	English
Pages (from-to)	2310-2317
Number of pages	8
Journal	Corrosion Science
Volume	50
Issue number	8
DOIs	https://doi.org/10.1016/j.corsci.2008.05.009
State	Published - Aug 2008
Externally published	Yes

Keywords

Corrosion inhibition
Mild steel
Phyllanthus amarus

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Materials Science

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10.1016/j.corsci.2008.05.009

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title = "Inhibitory action of Phyllanthus amarus extracts on the corrosion of mild steel in acidic media",

abstract = "The inhibitive action of leaves (LV), seeds (SD) and a combination of leaves and seeds (LVSD) extracts of Phyllanthus amarus on mild steel corrosion in HCl and H2SO4 solutions was studied using weight loss and gasometric techniques. The results indicate that the extracts functioned as a good inhibitor in both environments and inhibition efficiency increased with extracts concentration. Temperature studies revealed an increase in inhibition efficiency with rise in temperature and activation energies decreased in the presence of the extract. A mechanism of chemical adsorption of the plants components on the surface of the metal is proposed for the inhibition behaviour. The adsorption characteristics of the inhibitor were approximated by Temkin isotherm.",

keywords = "Corrosion inhibition, Mild steel, Phyllanthus amarus",

author = "Okafor, \{P. C.\} and Ikpi, \{M. E.\} and Uwah, \{I. E.\} and Ebenso, \{E. E.\} and Ekpe, \{U. J.\} and Umoren, \{S. A.\}",

year = "2008",

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doi = "10.1016/j.corsci.2008.05.009",

language = "English",

volume = "50",

pages = "2310--2317",

journal = "Corrosion Science",

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TY - JOUR

T1 - Inhibitory action of Phyllanthus amarus extracts on the corrosion of mild steel in acidic media

AU - Okafor, P. C.

AU - Ikpi, M. E.

AU - Uwah, I. E.

AU - Ebenso, E. E.

AU - Ekpe, U. J.

AU - Umoren, S. A.

PY - 2008/8

Y1 - 2008/8

N2 - The inhibitive action of leaves (LV), seeds (SD) and a combination of leaves and seeds (LVSD) extracts of Phyllanthus amarus on mild steel corrosion in HCl and H2SO4 solutions was studied using weight loss and gasometric techniques. The results indicate that the extracts functioned as a good inhibitor in both environments and inhibition efficiency increased with extracts concentration. Temperature studies revealed an increase in inhibition efficiency with rise in temperature and activation energies decreased in the presence of the extract. A mechanism of chemical adsorption of the plants components on the surface of the metal is proposed for the inhibition behaviour. The adsorption characteristics of the inhibitor were approximated by Temkin isotherm.

AB - The inhibitive action of leaves (LV), seeds (SD) and a combination of leaves and seeds (LVSD) extracts of Phyllanthus amarus on mild steel corrosion in HCl and H2SO4 solutions was studied using weight loss and gasometric techniques. The results indicate that the extracts functioned as a good inhibitor in both environments and inhibition efficiency increased with extracts concentration. Temperature studies revealed an increase in inhibition efficiency with rise in temperature and activation energies decreased in the presence of the extract. A mechanism of chemical adsorption of the plants components on the surface of the metal is proposed for the inhibition behaviour. The adsorption characteristics of the inhibitor were approximated by Temkin isotherm.

KW - Corrosion inhibition

KW - Mild steel

KW - Phyllanthus amarus

UR - https://www.scopus.com/pages/publications/50349101416

U2 - 10.1016/j.corsci.2008.05.009

DO - 10.1016/j.corsci.2008.05.009

M3 - Article

AN - SCOPUS:50349101416

SN - 0010-938X

VL - 50

SP - 2310

EP - 2317

JO - Corrosion Science

JF - Corrosion Science

IS - 8

ER -

Inhibitory action of Phyllanthus amarus extracts on the corrosion of mild steel in acidic media

Abstract

Keywords

ASJC Scopus subject areas

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