Inhibitory Action of Methanol Leaf Extract of Irvingia Gabonensis on the Corrosion of Mild Steel in H2SO4

Vincent Ishmael Egbulefu Ajiwe; Chinedu Emmanuel Ejike

doi:doi:10.11648/j.ajac.20190702.15

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Inhibitory Action of Methanol Leaf Extract of Irvingia Gabonensis on the Corrosion of Mild Steel in H₂SO₄

Vincent Ishmael Egbulefu Ajiwe, Chinedu Emmanuel Ejike

Published in American Journal of Applied Chemistry (Volume 7, Issue 2)

Received: 22 March 2019 Accepted: 30 April 2019 Published: 12 June 2019

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Abstract

The corrosion inhibition efficiency of methanol leaf extracts of Irvingia gabonensis for mild steel in 0.4, 0.5, 0.6 and 2.5M H₂SO₄ was investigated using weight loss and gasometric techniques in other to determine the phytochemical components of the crude leaf extract, the corrosion inhibition potential of the leaf extract, the thermodynamic parameters that aided the corrosion inhibition, the adsorption isotherm of the corrosion inhibition of the extracts using the Langmuir and Freundlich models and investigate the kinetics of the corrosion inhibition process. Preliminary phytochemical screening revealed the presence of tannins, saponnins, flavonoids, terpenes and alkaloids. From the results, the corrosion rates decreased with increase in inhibitor concentration. The maximum inhibition efficiency of 58.71% was obtained at extract concentration of 0.6g/L in 0.4M H₂SO₄ at 303K, 41.83% at extract concentration of 0.6g/L at 303K in 0.5M H₂SO₄ and 57.33% at extract concentration of 0.6g/L in 0.6M H₂SO₄ at 303K, for the gravimetric technique. In 2.5M H₂SO₄, maximum inhibition efficiency for the gasometric technique was 53.53% in 0.6g/L inhibitor concentration at 303K and for the gravimetric technique, the maximum inhibition efficiency was 29.42% in 0.6g/L inhibitor concentration at 303K. The kinetic and thermodynamic studies showed that activation energy (E_a) in the presence of inhibitor is greater than in the absence of inhibitor. From the E_a and ∆G^o_ads values obtained, a physical adsorption mechanism was proposed. The Langmuir isotherm was found to show better correlation (R²) at lower temperature while the Freundlich isotherm had better correlation at higher temperature.

Published in	American Journal of Applied Chemistry (Volume 7, Issue 2)
DOI	10.11648/j.ajac.20190702.15
Page(s)	72-79
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

Methanol Leaf Extract, Irvingia Gabonensis, Corrosion Inhibition

References

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Vincent Ishmael Egbulefu Ajiwe, Chinedu Emmanuel Ejike. (2019). Inhibitory Action of Methanol Leaf Extract of Irvingia Gabonensis on the Corrosion of Mild Steel in H2SO4. American Journal of Applied Chemistry, 7(2), 72-79. https://doi.org/10.11648/j.ajac.20190702.15

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ACS Style

Vincent Ishmael Egbulefu Ajiwe; Chinedu Emmanuel Ejike. Inhibitory Action of Methanol Leaf Extract of Irvingia Gabonensis on the Corrosion of Mild Steel in H2SO4. Am. J. Appl. Chem. 2019, 7(2), 72-79. doi: 10.11648/j.ajac.20190702.15

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AMA Style

Vincent Ishmael Egbulefu Ajiwe, Chinedu Emmanuel Ejike. Inhibitory Action of Methanol Leaf Extract of Irvingia Gabonensis on the Corrosion of Mild Steel in H2SO4. Am J Appl Chem. 2019;7(2):72-79. doi: 10.11648/j.ajac.20190702.15

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@article{10.11648/j.ajac.20190702.15,
  author = {Vincent Ishmael Egbulefu Ajiwe and Chinedu Emmanuel Ejike},
  title = {Inhibitory Action of Methanol Leaf Extract of Irvingia Gabonensis on the Corrosion of Mild Steel in H2SO4},
  journal = {American Journal of Applied Chemistry},
  volume = {7},
  number = {2},
  pages = {72-79},
  doi = {10.11648/j.ajac.20190702.15},
  url = {https://doi.org/10.11648/j.ajac.20190702.15},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajac.20190702.15},
  abstract = {The corrosion inhibition efficiency of methanol leaf extracts of Irvingia gabonensis for mild steel in 0.4, 0.5, 0.6 and 2.5M H2SO4 was investigated using weight loss and gasometric techniques in other to determine the phytochemical components of the crude leaf extract, the corrosion inhibition potential of the leaf extract, the thermodynamic parameters that aided the corrosion inhibition, the adsorption isotherm of the corrosion inhibition of the extracts using the Langmuir and Freundlich models and investigate the kinetics of the corrosion inhibition process. Preliminary phytochemical screening revealed the presence of tannins, saponnins, flavonoids, terpenes and alkaloids. From the results, the corrosion rates decreased with increase in inhibitor concentration. The maximum inhibition efficiency of 58.71% was obtained at extract concentration of 0.6g/L in 0.4M H2SO4 at 303K, 41.83% at extract concentration of 0.6g/L at 303K in 0.5M H2SO4 and 57.33% at extract concentration of 0.6g/L in 0.6M H2SO4 at 303K, for the gravimetric technique. In 2.5M H2SO4, maximum inhibition efficiency for the gasometric technique was 53.53% in 0.6g/L inhibitor concentration at 303K and for the gravimetric technique, the maximum inhibition efficiency was 29.42% in 0.6g/L inhibitor concentration at 303K. The kinetic and thermodynamic studies showed that activation energy (Ea) in the presence of inhibitor is greater than in the absence of inhibitor. From the Ea and ∆Goads values obtained, a physical adsorption mechanism was proposed. The Langmuir isotherm was found to show better correlation (R2) at lower temperature while the Freundlich isotherm had better correlation at higher temperature.},
 year = {2019}
}

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TY  - JOUR
T1  - Inhibitory Action of Methanol Leaf Extract of Irvingia Gabonensis on the Corrosion of Mild Steel in H2SO4
AU  - Vincent Ishmael Egbulefu Ajiwe
AU  - Chinedu Emmanuel Ejike
Y1  - 2019/06/12
PY  - 2019
N1  - https://doi.org/10.11648/j.ajac.20190702.15
DO  - 10.11648/j.ajac.20190702.15
T2  - American Journal of Applied Chemistry
JF  - American Journal of Applied Chemistry
JO  - American Journal of Applied Chemistry
SP  - 72
EP  - 79
PB  - Science Publishing Group
SN  - 2330-8745
UR  - https://doi.org/10.11648/j.ajac.20190702.15
AB  - The corrosion inhibition efficiency of methanol leaf extracts of Irvingia gabonensis for mild steel in 0.4, 0.5, 0.6 and 2.5M H2SO4 was investigated using weight loss and gasometric techniques in other to determine the phytochemical components of the crude leaf extract, the corrosion inhibition potential of the leaf extract, the thermodynamic parameters that aided the corrosion inhibition, the adsorption isotherm of the corrosion inhibition of the extracts using the Langmuir and Freundlich models and investigate the kinetics of the corrosion inhibition process. Preliminary phytochemical screening revealed the presence of tannins, saponnins, flavonoids, terpenes and alkaloids. From the results, the corrosion rates decreased with increase in inhibitor concentration. The maximum inhibition efficiency of 58.71% was obtained at extract concentration of 0.6g/L in 0.4M H2SO4 at 303K, 41.83% at extract concentration of 0.6g/L at 303K in 0.5M H2SO4 and 57.33% at extract concentration of 0.6g/L in 0.6M H2SO4 at 303K, for the gravimetric technique. In 2.5M H2SO4, maximum inhibition efficiency for the gasometric technique was 53.53% in 0.6g/L inhibitor concentration at 303K and for the gravimetric technique, the maximum inhibition efficiency was 29.42% in 0.6g/L inhibitor concentration at 303K. The kinetic and thermodynamic studies showed that activation energy (Ea) in the presence of inhibitor is greater than in the absence of inhibitor. From the Ea and ∆Goads values obtained, a physical adsorption mechanism was proposed. The Langmuir isotherm was found to show better correlation (R2) at lower temperature while the Freundlich isotherm had better correlation at higher temperature.
VL  - 7
IS  - 2
ER  -

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Author Information

Vincent Ishmael Egbulefu Ajiwe

Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria
Chinedu Emmanuel Ejike

Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria

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Vincent Ishmael Egbulefu Ajiwe, Chinedu Emmanuel Ejike. (2019). Inhibitory Action of Methanol Leaf Extract of Irvingia Gabonensis on the Corrosion of Mild Steel in H2SO4. American Journal of Applied Chemistry, 7(2), 72-79. https://doi.org/10.11648/j.ajac.20190702.15

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ACS Style

Vincent Ishmael Egbulefu Ajiwe; Chinedu Emmanuel Ejike. Inhibitory Action of Methanol Leaf Extract of Irvingia Gabonensis on the Corrosion of Mild Steel in H2SO4. Am. J. Appl. Chem. 2019, 7(2), 72-79. doi: 10.11648/j.ajac.20190702.15

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AMA Style

Vincent Ishmael Egbulefu Ajiwe, Chinedu Emmanuel Ejike. Inhibitory Action of Methanol Leaf Extract of Irvingia Gabonensis on the Corrosion of Mild Steel in H2SO4. Am J Appl Chem. 2019;7(2):72-79. doi: 10.11648/j.ajac.20190702.15

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@article{10.11648/j.ajac.20190702.15,
  author = {Vincent Ishmael Egbulefu Ajiwe and Chinedu Emmanuel Ejike},
  title = {Inhibitory Action of Methanol Leaf Extract of Irvingia Gabonensis on the Corrosion of Mild Steel in H2SO4},
  journal = {American Journal of Applied Chemistry},
  volume = {7},
  number = {2},
  pages = {72-79},
  doi = {10.11648/j.ajac.20190702.15},
  url = {https://doi.org/10.11648/j.ajac.20190702.15},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajac.20190702.15},
  abstract = {The corrosion inhibition efficiency of methanol leaf extracts of Irvingia gabonensis for mild steel in 0.4, 0.5, 0.6 and 2.5M H2SO4 was investigated using weight loss and gasometric techniques in other to determine the phytochemical components of the crude leaf extract, the corrosion inhibition potential of the leaf extract, the thermodynamic parameters that aided the corrosion inhibition, the adsorption isotherm of the corrosion inhibition of the extracts using the Langmuir and Freundlich models and investigate the kinetics of the corrosion inhibition process. Preliminary phytochemical screening revealed the presence of tannins, saponnins, flavonoids, terpenes and alkaloids. From the results, the corrosion rates decreased with increase in inhibitor concentration. The maximum inhibition efficiency of 58.71% was obtained at extract concentration of 0.6g/L in 0.4M H2SO4 at 303K, 41.83% at extract concentration of 0.6g/L at 303K in 0.5M H2SO4 and 57.33% at extract concentration of 0.6g/L in 0.6M H2SO4 at 303K, for the gravimetric technique. In 2.5M H2SO4, maximum inhibition efficiency for the gasometric technique was 53.53% in 0.6g/L inhibitor concentration at 303K and for the gravimetric technique, the maximum inhibition efficiency was 29.42% in 0.6g/L inhibitor concentration at 303K. The kinetic and thermodynamic studies showed that activation energy (Ea) in the presence of inhibitor is greater than in the absence of inhibitor. From the Ea and ∆Goads values obtained, a physical adsorption mechanism was proposed. The Langmuir isotherm was found to show better correlation (R2) at lower temperature while the Freundlich isotherm had better correlation at higher temperature.},
 year = {2019}
}

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TY  - JOUR
T1  - Inhibitory Action of Methanol Leaf Extract of Irvingia Gabonensis on the Corrosion of Mild Steel in H2SO4
AU  - Vincent Ishmael Egbulefu Ajiwe
AU  - Chinedu Emmanuel Ejike
Y1  - 2019/06/12
PY  - 2019
N1  - https://doi.org/10.11648/j.ajac.20190702.15
DO  - 10.11648/j.ajac.20190702.15
T2  - American Journal of Applied Chemistry
JF  - American Journal of Applied Chemistry
JO  - American Journal of Applied Chemistry
SP  - 72
EP  - 79
PB  - Science Publishing Group
SN  - 2330-8745
UR  - https://doi.org/10.11648/j.ajac.20190702.15
AB  - The corrosion inhibition efficiency of methanol leaf extracts of Irvingia gabonensis for mild steel in 0.4, 0.5, 0.6 and 2.5M H2SO4 was investigated using weight loss and gasometric techniques in other to determine the phytochemical components of the crude leaf extract, the corrosion inhibition potential of the leaf extract, the thermodynamic parameters that aided the corrosion inhibition, the adsorption isotherm of the corrosion inhibition of the extracts using the Langmuir and Freundlich models and investigate the kinetics of the corrosion inhibition process. Preliminary phytochemical screening revealed the presence of tannins, saponnins, flavonoids, terpenes and alkaloids. From the results, the corrosion rates decreased with increase in inhibitor concentration. The maximum inhibition efficiency of 58.71% was obtained at extract concentration of 0.6g/L in 0.4M H2SO4 at 303K, 41.83% at extract concentration of 0.6g/L at 303K in 0.5M H2SO4 and 57.33% at extract concentration of 0.6g/L in 0.6M H2SO4 at 303K, for the gravimetric technique. In 2.5M H2SO4, maximum inhibition efficiency for the gasometric technique was 53.53% in 0.6g/L inhibitor concentration at 303K and for the gravimetric technique, the maximum inhibition efficiency was 29.42% in 0.6g/L inhibitor concentration at 303K. The kinetic and thermodynamic studies showed that activation energy (Ea) in the presence of inhibitor is greater than in the absence of inhibitor. From the Ea and ∆Goads values obtained, a physical adsorption mechanism was proposed. The Langmuir isotherm was found to show better correlation (R2) at lower temperature while the Freundlich isotherm had better correlation at higher temperature.
VL  - 7
IS  - 2
ER  -

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