Corrosion Inhibition of Aqueous Extract of Cocos niicifera - Coconut Palm - Petiole Extract from Destructive Distillation for the Corrosion of Mild Steel in Acidic Medium
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Date
2010
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Abstract
The inhibitive effect and adsorption properties of petiole extract obtained from
destructive distillation of cocos nucifera for the corrosion of mild steel in 0.5 M H2SO4
and 1 M HCl were investigated using mass loss, polarization and electrochemical
impedance techniques of monitoring corrosion. The results obtained indicate that petiole
extract of cocos nucifera behaves as good inhibitor for the corrosion of mild steel in 0.5
M H2SO4 and 1 M HCl. Activation energy of thermodynamic parameter was evaluated
from temperature studies result. The adsorption of the inhibitor on mild steel surface
was found to be spontaneous, endothermic and consistent with the assumptions of
Langmuir adsorption isotherm. The electrochemical measurements reveal that the
petiole extract behaved like mixed type inhibitor. Efforts are made to analyze the
effectiveness of petiole extract of coconut palm in industrial processes.