Journal of Advanced Chemical Sciences (JACS)

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Article – Journal of Environmental Sciences

Journal of Environmental Science and Pollution Research, Volume 4,Issue 1,2018 Pages 246-249

Crude Alkaloid and Saponin Extracts of Agrimonia eupatoria Plant as Control Measure in Stainless Steel Corrosion in Hydrogen Tetraoxosulphate (VI) Acid Rich Area
B.U. Ugi*, M.E. Obeten, Ekerete Jackson

The corrosion and inhibition behavior of carbon steel in hydrogen tetraoxosulphate (IV) acid rich area in the presence of crude saponins and alkaloids extracts of Agrimonia eupatoria leaves have been studied using mass loss and potentiodynamic polarization techniques. The extracts presented good inhibition ability on the carbon steel metal in hydrogen tetraoxosulphate (IV) acid environment with the alkaloids inhibiting more compared to saponins with maximum inhibition efficiency of 97.6 % and 87.8 % respectively at 7.5 g/L concentration. There was a noticeable increase in inhibition mitigation potential of the inhibitors with increasing concentration of extracts. A physical adsorption mechanism was recorded by the inhibitor/carbon steel interface and the Langmuir adsorption isotherm was well obeyed with correlation coefficient at approximately unity. The inhibitors proved to be stable ones on the metal and a spontaneous reaction process was recorded from the data of the Gibbs free energy of adsorption.

Keywords: Polarization; Inhibition Efficiency; Gibbs Free Energy; Saponins;