The effect of temperature on the corrosion of steel

in 1M HCl in the presence of quinoxaline compound

 

M. Benabdellah1, K. Tebbji1, B. Hammouti1*, R. Touzani1,2, A. Aouniti1, A. Dafali1, S. El Kadiri1

1  Laboratoire de Chimie Appliquée et Environnement, Faculté  des Sciences, Oujda, Morocco

         2 Faculté Pluridisciplinaire de Nador, Université Mohammed 1er,  B.P. 300, 62700 Selouane, Nador, Morocco

* Corresponding author. E-mail: hammoutib@gmail.com

Received: 12 August 2007; revised version accepted: 01 April 2008

 

Abstract

     The temperature effect on the corrosion behaviour of steel in 1M hydrochloric acid solution in the presence and absence of a quinoxaline compound has been investigated by weight loss method. The inhibitory effect increases with increasing inhibitors concentration and decreases with rising temperature. Thermodynamic parameters such as adsorption heat, adsorption entropy and adsorption free energy were obtained from experimental weight loss data of the temperature studies of the inhibition process at different temperatures ranging from 308 to 353K. The most suitable range of inhibitor concentration was discussed. The kinetic data such as apparent activation energies and pre-exponential factors at different concentrations of the best inhibitor were calculated and the inhibitive action was satisfactorily explained by using both thermodynamic and kinetic models.

 

Keywords: Corrosion ; Inhibition ; Quinoxaline ; Kinetic ; Adsorption.

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