Colloid and Surface Science

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Talinum triangulare (Waterleaf) Methanol Leaf Extract as Corrosion Inhibitor on Mild Steel Surface in H2SO4

Received: 28 November 2019    Accepted: 20 December 2019    Published: 08 January 2020
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Abstract

The inhibition effects of methanol leaf extract of Talinum triangulare on the corrosion of mild steel in 0.4, 0.5, 0.6 and 2.5M H2SO4 solution were determined in this study. The inhibition efficiency was evaluated and the mechanism of inhibition determined, with a view to determining the inhibitive potentials of the inhibitor with regard to corrosivity of acid solutions used in oil pipelines, water treatment systems and descaling of equipment. Weight loss and gasometric techniques were used for the corrosion study of the metal. The weight loss method of corrosion tests was carried out at 2, 4, 6, 8 and 10 hours of exposure using various concentrations of extract (0.2, 0.4 and 0.6) g/L at different temperatures (303K, 313K and 323K) in varying acid concentration (0.4M, 0.5M and 0.6M). The gasometric measurements were carried out at 5, 10, 15, 20, 25 and 30 minutes exposure time using various concentrations of extract (0.2, 0.4 and 0.6) g/L in 2.5M H2SO4 solution. Weight loss measurements were also carried out concurrently with gasometric measurements to compare methodological variation in data between them. The phytochemical screening results revealed the presence of tannins, saponnins, flavonoids, terpenes, steroids and alkaloids. From the results, the corrosion rates decreased with increase in inhibitor concentration. The maximum inhibition efficiency of the extract for the weight loss measurements are 70.77% for 0.6g/L in 0.4M H2SO4 at 303K, 54.86% for 0.6g/L in 0.5M H2SO4 at 303K and 61.66% for 0.6g/L in 0.6M at 303K. In 2.5M H2SO4, the maximum inhibition efficiency was observed to be 59.31% for 0.6g/L inhibitor concentration at 308K for the gasometric method and 53.38% for 0.6g/L at 308K for the weight loss method. The kinetic and thermodynamic studies showed that the activation energy (Ea) in the presence of inhibitor is greater than in the absence of inhibitor at all the temperatures studied. The reaction was proposed to be first order having shown good correlation (R2≈1) with the first order rate law, and the half-life (t1/2) values were obtained from the graphs of the rate law. The mechanism of physical adsorption was proposed for the extract, as within the temperature range investigated the Ea and ∆Goads values are less than 80kJ/mol and -20kJ/mol respectively.

DOI 10.11648/j.css.20200501.12
Published in Colloid and Surface Science (Volume 5, Issue 1, June 2020)
Page(s) 6-12
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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), 2024. Published by Science Publishing Group

Keywords

Methanol Leaf Extract, Talinum triangulare, Corrosion Inhibition

References
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[5] Al-Sehaibani, A. (2000). Evaluation of Extracts of Henna Leaves as Environmentally Friendly Corrosion Inhibitors for Metals. Material Wissenchaft and Werkstofftechnik. 12 (31): 1060-1063.
[6] Eddy, N. O., Ebenso, E. E. (2008). Adsorption and inhibitive properties of ethanol extracts of Musa sapientum peels as a green corrosion inhibitor for mild steel in H2SO4. African Journal of Pure and Applied Chemistry. 2 (6): 046-054.
[7] Eddy, N. O., Ekwumemgbo, P. A. and Mamza, P. A. P. (2009). Ethanol extract of Terminalia catappa as a green inhibitor for the corrosion of mild steel in H2SO4. Green Chemistry Letters and Reviews. 2 (4): 223-231.
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[15] Nnanna, L. A., Onwuagba, B. N., Mejeha, I. M. and Okeoma, K. B. (2010). Inhibition effects of some plant extracts on the acid corrosion of aluminium alloy. African Journal of Pure and Applied Chemistry. 4 (1): 011-016.
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[19] Umoren, S. A., Ebenso, E. E. (2008). Studies of anti-corrosion effect of Raphia hookeri exudates gum-halide mixtures for aluminium corrosion in acidic medium. Pigment and Resin Technology. 37 (3): 173-182.
[20] Ebenso, E. E., Eddy, N. O., Odiongenyi, A. O. (2008). Corrosion inhibitive properties and adsorption behavior of ethanol extract of Piper guinensis as a green corrosion inhibitor for mild steel in H2SO4. African Journal of Pure and Applied Chemistry. 2 (11): 107-115.
[21] Umoren, S. A., Ogbobe, O., and Ebenso, E. E. (2006). Synergistic inhibition of aluminium corrosion in acidic medium by gum Arabic and halide ions. Transactions of the SAEST. 41: 74-81.
[22] Mourya P., Banerjee S., Singh M. M. (2014). Corrosion inhibition of mild steel in acidic solution by Tagetes erecta (Marigold flower) extract as a green inhibitor. Corrosion Science. 85: 352–363.
[23] Umoren, S. A., Obot, I. B., Obi-Egbedi, N. O. (2009). Raphia hookeri gum as a potential eco-friendly inhibitor for mild steel in sulfuric acid. Journal of Material Science. 44: 274-279.
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Author Information
  • Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria

  • Department of Environmental Biotechnology, National Biotechnology Development Agency, Abuja, Nigeria

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    Vincent Ishmael Egbulefu Ajiwe, Chinedu Emmanuel Ejike. (2020). Talinum triangulare (Waterleaf) Methanol Leaf Extract as Corrosion Inhibitor on Mild Steel Surface in H2SO4. Colloid and Surface Science, 5(1), 6-12. https://doi.org/10.11648/j.css.20200501.12

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    Vincent Ishmael Egbulefu Ajiwe; Chinedu Emmanuel Ejike. Talinum triangulare (Waterleaf) Methanol Leaf Extract as Corrosion Inhibitor on Mild Steel Surface in H2SO4. Colloid Surf. Sci. 2020, 5(1), 6-12. doi: 10.11648/j.css.20200501.12

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    AMA Style

    Vincent Ishmael Egbulefu Ajiwe, Chinedu Emmanuel Ejike. Talinum triangulare (Waterleaf) Methanol Leaf Extract as Corrosion Inhibitor on Mild Steel Surface in H2SO4. Colloid Surf Sci. 2020;5(1):6-12. doi: 10.11648/j.css.20200501.12

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  • @article{10.11648/j.css.20200501.12,
      author = {Vincent Ishmael Egbulefu Ajiwe and Chinedu Emmanuel Ejike},
      title = {Talinum triangulare (Waterleaf) Methanol Leaf Extract as Corrosion Inhibitor on Mild Steel Surface in H2SO4},
      journal = {Colloid and Surface Science},
      volume = {5},
      number = {1},
      pages = {6-12},
      doi = {10.11648/j.css.20200501.12},
      url = {https://doi.org/10.11648/j.css.20200501.12},
      eprint = {https://download.sciencepg.com/pdf/10.11648.j.css.20200501.12},
      abstract = {The inhibition effects of methanol leaf extract of Talinum triangulare on the corrosion of mild steel in 0.4, 0.5, 0.6 and 2.5M H2SO4 solution were determined in this study. The inhibition efficiency was evaluated and the mechanism of inhibition determined, with a view to determining the inhibitive potentials of the inhibitor with regard to corrosivity of acid solutions used in oil pipelines, water treatment systems and descaling of equipment. Weight loss and gasometric techniques were used for the corrosion study of the metal. The weight loss method of corrosion tests was carried out at 2, 4, 6, 8 and 10 hours of exposure using various concentrations of extract (0.2, 0.4 and 0.6) g/L at different temperatures (303K, 313K and 323K) in varying acid concentration (0.4M, 0.5M and 0.6M). The gasometric measurements were carried out at 5, 10, 15, 20, 25 and 30 minutes exposure time using various concentrations of extract (0.2, 0.4 and 0.6) g/L in 2.5M H2SO4 solution. Weight loss measurements were also carried out concurrently with gasometric measurements to compare methodological variation in data between them. The phytochemical screening results revealed the presence of tannins, saponnins, flavonoids, terpenes, steroids and alkaloids. From the results, the corrosion rates decreased with increase in inhibitor concentration. The maximum inhibition efficiency of the extract for the weight loss measurements are 70.77% for 0.6g/L in 0.4M H2SO4 at 303K, 54.86% for 0.6g/L in 0.5M H2SO4 at 303K and 61.66% for 0.6g/L in 0.6M at 303K. In 2.5M H2SO4, the maximum inhibition efficiency was observed to be 59.31% for 0.6g/L inhibitor concentration at 308K for the gasometric method and 53.38% for 0.6g/L at 308K for the weight loss method. The kinetic and thermodynamic studies showed that the activation energy (Ea) in the presence of inhibitor is greater than in the absence of inhibitor at all the temperatures studied. The reaction was proposed to be first order having shown good correlation (R2≈1) with the first order rate law, and the half-life (t1/2) values were obtained from the graphs of the rate law. The mechanism of physical adsorption was proposed for the extract, as within the temperature range investigated the Ea and ∆Goads values are less than 80kJ/mol and -20kJ/mol respectively.},
     year = {2020}
    }
    

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  • TY  - JOUR
    T1  - Talinum triangulare (Waterleaf) Methanol Leaf Extract as Corrosion Inhibitor on Mild Steel Surface in H2SO4
    AU  - Vincent Ishmael Egbulefu Ajiwe
    AU  - Chinedu Emmanuel Ejike
    Y1  - 2020/01/08
    PY  - 2020
    N1  - https://doi.org/10.11648/j.css.20200501.12
    DO  - 10.11648/j.css.20200501.12
    T2  - Colloid and Surface Science
    JF  - Colloid and Surface Science
    JO  - Colloid and Surface Science
    SP  - 6
    EP  - 12
    PB  - Science Publishing Group
    SN  - 2578-9236
    UR  - https://doi.org/10.11648/j.css.20200501.12
    AB  - The inhibition effects of methanol leaf extract of Talinum triangulare on the corrosion of mild steel in 0.4, 0.5, 0.6 and 2.5M H2SO4 solution were determined in this study. The inhibition efficiency was evaluated and the mechanism of inhibition determined, with a view to determining the inhibitive potentials of the inhibitor with regard to corrosivity of acid solutions used in oil pipelines, water treatment systems and descaling of equipment. Weight loss and gasometric techniques were used for the corrosion study of the metal. The weight loss method of corrosion tests was carried out at 2, 4, 6, 8 and 10 hours of exposure using various concentrations of extract (0.2, 0.4 and 0.6) g/L at different temperatures (303K, 313K and 323K) in varying acid concentration (0.4M, 0.5M and 0.6M). The gasometric measurements were carried out at 5, 10, 15, 20, 25 and 30 minutes exposure time using various concentrations of extract (0.2, 0.4 and 0.6) g/L in 2.5M H2SO4 solution. Weight loss measurements were also carried out concurrently with gasometric measurements to compare methodological variation in data between them. The phytochemical screening results revealed the presence of tannins, saponnins, flavonoids, terpenes, steroids and alkaloids. From the results, the corrosion rates decreased with increase in inhibitor concentration. The maximum inhibition efficiency of the extract for the weight loss measurements are 70.77% for 0.6g/L in 0.4M H2SO4 at 303K, 54.86% for 0.6g/L in 0.5M H2SO4 at 303K and 61.66% for 0.6g/L in 0.6M at 303K. In 2.5M H2SO4, the maximum inhibition efficiency was observed to be 59.31% for 0.6g/L inhibitor concentration at 308K for the gasometric method and 53.38% for 0.6g/L at 308K for the weight loss method. The kinetic and thermodynamic studies showed that the activation energy (Ea) in the presence of inhibitor is greater than in the absence of inhibitor at all the temperatures studied. The reaction was proposed to be first order having shown good correlation (R2≈1) with the first order rate law, and the half-life (t1/2) values were obtained from the graphs of the rate law. The mechanism of physical adsorption was proposed for the extract, as within the temperature range investigated the Ea and ∆Goads values are less than 80kJ/mol and -20kJ/mol respectively.
    VL  - 5
    IS  - 1
    ER  - 

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