2.5-Difuryl-N-Methylpyrrole as Corrosion Inhibitor for Steel in 1 M HCl

 

 

O. Krim^a, M. Bouachrine^b, B. Hammouti*^,a, a. elidrissi^a, M. Hamidi^b

 

^a  Laboratoire de Chimie Appliquée et Environnement, Faculté des Sciences,B.P. 717, Oujda, Morocco

^b Unité de Recherche sur les Macromolécules & Modélisation, Faculté des Sciences et Technique, B.P. 509 Boutalamine,  Errachidia, Morocco

 

Received 13 September 2007 ; accepted 13 February 2008

 

 

Abstract

This work is a study of 2.5-difuryl-N-methylpyrrole (B1) compound on the corrosion of steel in HCl medium. The investigation was carried out using gravimetric and electrochemical polarisation measurements. The corrosion rate decreases continuously with concentration of the compound (B1) and the efficiency increases to reach 90 % at 10^-3 M. Polarisation results indicate that B1 is a cathodic inhibitor. B1 is adsorbed on metal surface according to the Langmuir isotherm. Value of free enthalpy of adsorption obtained involves chemisorption between inhibitor molecules and metal surface.

Keywords: corrosion, inhibition, steel, acid, pyrrole, Langmuir.

 

 

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* Corresponding author. E-mail address: hammoutib@yahoo.fr