Open AccessCorrosion Inhibition of Aqueous Extract of Cocos nucifera - Coconut Palm - Petiole Extract from Destructive Distillation for the Corrosion of Mild Steel in Acidic Medium
Author(s) -
P. Vijayalakshmi,
R. Rajalakshmi,
S. Subhashini
Publication year - 2011
Publication title -
portugaliae electrochimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.252
H-Index - 27
eISSN - 1647-1571
pISSN - 0872-1904
DOI - 10.4152/pea.201101009
Subject(s) - cocos nucifera , corrosion , petiole (insect anatomy) , distillation , aqueous extract , palm , aqueous solution , pulp and paper industry , chemistry , materials science , nuclear chemistry , metallurgy , chromatography , traditional medicine , botany , organic chemistry , biology , medicine , engineering , hymenoptera , physics , quantum mechanics
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 H 2SO 4 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 H 2SO 4 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.
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