Corrosion Inhibition and Adsorption Properties of Commelina benghalensis Leaves Extract on Mild Steel in 1M H2SO4 Solution
Science Journal of Analytical Chemistry
Volume 8, Issue 2, June 2020, Pages: 86-92
Received: Apr. 30, 2020; Accepted: Jun. 15, 2020; Published: Jun. 28, 2020
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Collins Chibuzor Odidika, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria
Vincent Ishmael Egbulefu Ajiwe, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria
Charity Nkiruka Eboagu, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria
Chiagozie Michael Ekwunife, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria
Chioma Irene Awuzie, Department of Science Laboratory Technology, Federal Polytechnic, Oko, Nigeria
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The corrosion inhibition of mild steel in 1M sulphuric acid solution by the ethanol extract of Commelina benghalensis (C. B) leaves was determined using gravimetric technique. Phytochemical analysis was carried out on the extract and the effect of extract concentration, temperature, immersion time and acid concentration on the corrosion process was determined. The corrosion inhibition efficiency of the extract increased with increase in the concentration of the extract and decreased with increase in temperature. Increase in temperature also increased the corrosion rate of mild steel in 1M sulphuric acid in the absence and presence of different concentrations of the extract. The adsorption of the plant extract obeyed Langmuir and Freundlich adsorption isotherms. The process of physical adsorption was proposed for the extract from the trends of inhibition efficiency with temperature and from calculated values of Gibbs free energy, activation energy and enthalpy of adsorption. Gibbs free energy values for the reactions were less than 20kJ/mol, indicating physical adsorption process and were also found to be negative, indicating that the adsorption process was spontaneous. The corrosion inhibition efficiency (% IE) of the plant extract was attributed to the phytochemical constituents (alkaloids, flavonoids, tannins, saponins, phenolics, steroids and cardiac glycosides) present in them. The results showed that Commelina benghalensis can serve as a good corrosion inhibitor of mild steel in acid medium, since it reached a corrosion inhibition efficiency (% IE) of 91.91% at 2.0g/L extract concentration.
Commelina benghalensis, Mild Steel, Adsorption, Sulphuric Acid, Corrosion Inhibitor, Gravimetric Technique
To cite this article
Collins Chibuzor Odidika, Vincent Ishmael Egbulefu Ajiwe, Charity Nkiruka Eboagu, Chiagozie Michael Ekwunife, Chioma Irene Awuzie, Corrosion Inhibition and Adsorption Properties of Commelina benghalensis Leaves Extract on Mild Steel in 1M H2SO4 Solution, Science Journal of Analytical Chemistry. Vol. 8, No. 2, 2020, pp. 86-92. doi: 10.11648/j.sjac.20200802.18
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