Corrosion Inhibition of Aqueous Extract of Cocos nucifera - Coconut Palm - Petiole Extract from Destructive Distillation for the Corrosion of Mild Steel in Acidic Medium

 

P.R. Vijayalakshmi,^1,* R. Rajalakshmi² and S. Subhashini²

¹ Department of Chemistry, Dr. G.R. Damodaran College of Science, Coimbatore - 641 014, Tamil Nadu, India

² Department of Chemistry, Avinashilingam University For Women, Coimbatore - 641 043, Tamil Nadu, India

 

DOI: 10.4152/pea.201101009

 

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.

Keywords: corrosion inhibition, mild steel, adsorption, cocos nucifera petiole, GC-MS.

 

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* Corresponding author. E-mail address: kamramvijib128@gmail.com

Received 6 December 2009; accepted 2 February 2011