Inhibition of mild steel corrosion in H2SO4 solution by coconut coir dust extract obtained from different solvent systems and synergistic effect of iodide ions: Ethanol and acetone extracts

Saviour A. Umoren; Moses M. Solomon; Ubong M. Eduok; Ime B. Obot; Aniekemeabasi U. Israel

doi:10.1016/j.jece.2014.03.024

Inhibition of mild steel corrosion in H₂SO₄ solution by coconut coir dust extract obtained from different solvent systems and synergistic effect of iodide ions: Ethanol and acetone extracts

Saviour A. Umoren^*
, Moses M. Solomon
, Ubong M. Eduok
, Ime B. Obot
, Aniekemeabasi U. Israel

^*Corresponding author for this work

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

148 Scopus citations

Abstract

Weight loss and electrochemical (open circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy) techniques were used to assess the effectiveness of ethanol and acetone extracts of coconut coir dust as corrosion inhibitor for mild steel in 0.5 M H₂SO₄ solution at 30-60 °C. It was found that both ethanol and acetone extracts of coconut coir dust retard the dissolution of mild steel in 0.5 M H ₂SO₄ solution, but a pronounced effect was noted with ethanol extract. The inhibition efficiency increased with increase in extract concentration but decreased with rise in temperature, which is suggestive of physical adsorption mechanism. Addition of KI was found to synergistically enhance the protective ability of coconut coir dust extracts obtained from both solvent systems investigated. The synergistic effect was confirmed from the synergism parameter (S₀) which was found to be greater than unity. Potentiodynamic polarization result suggests that coconut coir extracts functioned as mixed-type inhibitor. The adsorption of coconut coir dust extracts onto the mild steel surface followed Freundlich adsorption isotherm model. The mechanism of physisorption of the extracts onto the steel surface is proposed from the trend of inhibition efficiency with temperature which is corroborated by the values of activation parameters obtained from the experimental data.

Original language	English
Pages (from-to)	1048-1060
Number of pages	13
Journal	Journal of Environmental Chemical Engineering
Volume	2
Issue number	2
DOIs	https://doi.org/10.1016/j.jece.2014.03.024
State	Published - Jun 2014
Externally published	Yes

Bibliographical note

Funding Information:
This project is funded by TWAS, the Academy of Sciences for the Developing World, under the TWAS Grants for Research Units in Developing Countries Program ( 10-107RG/CHE/AF/AC-G ). We also acknowledged financial support from the Vice Chancellor University of Uyo, Uyo, Nigeria. We are also grateful to the Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia for the technical assistance in performing AFM surface morphology.

Keywords

Acid corrosion
Coconut coir dust
Corrosion inhibition
Mild steel
Synergistic effect

ASJC Scopus subject areas

Chemical Engineering (miscellaneous)
Waste Management and Disposal
Pollution
Process Chemistry and Technology

Access to Document

10.1016/j.jece.2014.03.024

Cite this

Umoren, S. A., Solomon, M. M., Eduok, U. M., Obot, I. B., & Israel, A. U. (2014). Inhibition of mild steel corrosion in H₂SO₄ solution by coconut coir dust extract obtained from different solvent systems and synergistic effect of iodide ions: Ethanol and acetone extracts. Journal of Environmental Chemical Engineering, 2(2), 1048-1060. https://doi.org/10.1016/j.jece.2014.03.024

@article{d54d1bca85d9482c8a30854839f251ed,

title = "Inhibition of mild steel corrosion in H2SO4 solution by coconut coir dust extract obtained from different solvent systems and synergistic effect of iodide ions: Ethanol and acetone extracts",

abstract = "Weight loss and electrochemical (open circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy) techniques were used to assess the effectiveness of ethanol and acetone extracts of coconut coir dust as corrosion inhibitor for mild steel in 0.5 M H2SO4 solution at 30-60 °C. It was found that both ethanol and acetone extracts of coconut coir dust retard the dissolution of mild steel in 0.5 M H 2SO4 solution, but a pronounced effect was noted with ethanol extract. The inhibition efficiency increased with increase in extract concentration but decreased with rise in temperature, which is suggestive of physical adsorption mechanism. Addition of KI was found to synergistically enhance the protective ability of coconut coir dust extracts obtained from both solvent systems investigated. The synergistic effect was confirmed from the synergism parameter (S0) which was found to be greater than unity. Potentiodynamic polarization result suggests that coconut coir extracts functioned as mixed-type inhibitor. The adsorption of coconut coir dust extracts onto the mild steel surface followed Freundlich adsorption isotherm model. The mechanism of physisorption of the extracts onto the steel surface is proposed from the trend of inhibition efficiency with temperature which is corroborated by the values of activation parameters obtained from the experimental data.",

keywords = "Acid corrosion, Coconut coir dust, Corrosion inhibition, Mild steel, Synergistic effect",

author = "Umoren, \{Saviour A.\} and Solomon, \{Moses M.\} and Eduok, \{Ubong M.\} and Obot, \{Ime B.\} and Israel, \{Aniekemeabasi U.\}",

note = "Funding Information: This project is funded by TWAS, the Academy of Sciences for the Developing World, under the TWAS Grants for Research Units in Developing Countries Program ( 10-107RG/CHE/AF/AC-G ). We also acknowledged financial support from the Vice Chancellor University of Uyo, Uyo, Nigeria. We are also grateful to the Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia for the technical assistance in performing AFM surface morphology. ",

year = "2014",

month = jun,

doi = "10.1016/j.jece.2014.03.024",

language = "English",

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journal = "Journal of Environmental Chemical Engineering",

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Umoren, SA, Solomon, MM, Eduok, UM, Obot, IB & Israel, AU 2014, 'Inhibition of mild steel corrosion in H₂SO₄ solution by coconut coir dust extract obtained from different solvent systems and synergistic effect of iodide ions: Ethanol and acetone extracts', Journal of Environmental Chemical Engineering, vol. 2, no. 2, pp. 1048-1060. https://doi.org/10.1016/j.jece.2014.03.024

Inhibition of mild steel corrosion in H₂SO₄ solution by coconut coir dust extract obtained from different solvent systems and synergistic effect of iodide ions: Ethanol and acetone extracts. / Umoren, Saviour A.; Solomon, Moses M.; Eduok, Ubong M. et al.
In: Journal of Environmental Chemical Engineering, Vol. 2, No. 2, 06.2014, p. 1048-1060.

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

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T1 - Inhibition of mild steel corrosion in H2SO4 solution by coconut coir dust extract obtained from different solvent systems and synergistic effect of iodide ions

T2 - Ethanol and acetone extracts

AU - Umoren, Saviour A.

AU - Solomon, Moses M.

AU - Eduok, Ubong M.

AU - Obot, Ime B.

AU - Israel, Aniekemeabasi U.

N1 - Funding Information: This project is funded by TWAS, the Academy of Sciences for the Developing World, under the TWAS Grants for Research Units in Developing Countries Program ( 10-107RG/CHE/AF/AC-G ). We also acknowledged financial support from the Vice Chancellor University of Uyo, Uyo, Nigeria. We are also grateful to the Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia for the technical assistance in performing AFM surface morphology.

PY - 2014/6

Y1 - 2014/6

N2 - Weight loss and electrochemical (open circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy) techniques were used to assess the effectiveness of ethanol and acetone extracts of coconut coir dust as corrosion inhibitor for mild steel in 0.5 M H2SO4 solution at 30-60 °C. It was found that both ethanol and acetone extracts of coconut coir dust retard the dissolution of mild steel in 0.5 M H 2SO4 solution, but a pronounced effect was noted with ethanol extract. The inhibition efficiency increased with increase in extract concentration but decreased with rise in temperature, which is suggestive of physical adsorption mechanism. Addition of KI was found to synergistically enhance the protective ability of coconut coir dust extracts obtained from both solvent systems investigated. The synergistic effect was confirmed from the synergism parameter (S0) which was found to be greater than unity. Potentiodynamic polarization result suggests that coconut coir extracts functioned as mixed-type inhibitor. The adsorption of coconut coir dust extracts onto the mild steel surface followed Freundlich adsorption isotherm model. The mechanism of physisorption of the extracts onto the steel surface is proposed from the trend of inhibition efficiency with temperature which is corroborated by the values of activation parameters obtained from the experimental data.

AB - Weight loss and electrochemical (open circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy) techniques were used to assess the effectiveness of ethanol and acetone extracts of coconut coir dust as corrosion inhibitor for mild steel in 0.5 M H2SO4 solution at 30-60 °C. It was found that both ethanol and acetone extracts of coconut coir dust retard the dissolution of mild steel in 0.5 M H 2SO4 solution, but a pronounced effect was noted with ethanol extract. The inhibition efficiency increased with increase in extract concentration but decreased with rise in temperature, which is suggestive of physical adsorption mechanism. Addition of KI was found to synergistically enhance the protective ability of coconut coir dust extracts obtained from both solvent systems investigated. The synergistic effect was confirmed from the synergism parameter (S0) which was found to be greater than unity. Potentiodynamic polarization result suggests that coconut coir extracts functioned as mixed-type inhibitor. The adsorption of coconut coir dust extracts onto the mild steel surface followed Freundlich adsorption isotherm model. The mechanism of physisorption of the extracts onto the steel surface is proposed from the trend of inhibition efficiency with temperature which is corroborated by the values of activation parameters obtained from the experimental data.

KW - Acid corrosion

KW - Coconut coir dust

KW - Corrosion inhibition

KW - Mild steel

KW - Synergistic effect

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DO - 10.1016/j.jece.2014.03.024

M3 - Article

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