Thermodynamic characterisation of steel corrosion for the

corrosion inhibition of steel in sulphuric acid solutions by artemisia

 M. Bouklah, B. Hammouti *

Laboratoire de Chimie des Eaux et Corrosion, Faculté des Sciences, B.P. 717, Oujda, Morocco

 

Received 1 December 2005; accepted in revised form 8 November 2006

 

Abstract

The effect of natural occurring extract of artemisia on the corrosion of steel in 0.5 M H₂SO₄ in the temperature range 298 – 353 K is studied by weight loss method, electrochemical polarisation and linear polarisation R_p measurements. Results obtained reveal that extract reduces the corrosion rate. The inhibition efficiency increases with the increase of artemisia content at 10 g/L to reach 95% and 99% at 298 and 353 K, respectively. Results obtained by gravimetric and electrochemical polarisation are in good agreement. Polarisation studies clearly reveal that the presence of the natural artemisia does not change the mechanism of the hydrogen evolution reaction and acts as a mixed type inhibitor. The inhibition efficiency increases with temperature. The adsorption of artemisia on the steel follows Langmuir adsorption isotherm.

Keywords: steel, artemisia, inhibition, corrosion, acid, natural substance.

 

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