Inhibitory Impact of Crude Phytochemical Compounds of Symphytum Officinali (Comfrey) Leaves on the Corrosion of Copper by Hydrogen Tetraoxosulphate (IV) (H2SO4) Acid Solution

International Journal of Applied Chemistry

© 2018 by SSRG - IJAC Journal

Volume 5 Issue 2

Year of Publication : 2018

Authors : B.U.Ugi, M.E.Obeten

10.14445/23939133/IJAC-V5I2P105

How to Cite?

B.U.Ugi, M.E.Obeten, "Inhibitory Impact of Crude Phytochemical Compounds of Symphytum Officinali (Comfrey) Leaves on the Corrosion of Copper by Hydrogen Tetraoxosulphate (IV) (H2SO4) Acid Solution," SSRG International Journal of Applied Chemistry, vol. 5,  no. 2, pp. 22-32, 2018. Crossref, https://doi.org/10.14445/23939133/IJAC-V5I2P105

Abstract:

Crude Alkaloid, Saponins and flavonoids extract of Symphytum officinali (CAESO, CSESO and CFESO) leaves were investigated as corrosion inhibitor of copper in 0.5 M H2SO4 acid solutions using weight loss, Thermometric, potentiodynamic polarization and electrochemical impedance spectroscopy studies. The weight loss results revealed that the plant extracts are an reliable corrosion inhibitors to the metal tested. Electrochemical polarization data revealed a mixed mode of inhibition and the results of electrochemical impedance spectroscopy have shown that the change in the impedance parameter (charge transfer resistance and double layer capacitance) with the change in concentration of the inhibitorts is due to the adsorption of active molecules leading to the formation of a protective layer on the surface of copper. A physical adsorption mechanism was recorded by the inhibitor /metal interface and the Langmuir adsorption isotherm was well obeyed revealing from the good correlation of the data to the isotherm. The inhibitors proved to be a stabled one on the copper surface and a spontaneous reaction process was recorded from the free energy data.

Keywords:

Symphytum officinali, Langmuir isotherm, weight loss, Gibbs free energy, thermometric method, tafel plots

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