Effect of Diaminoalkane Derivatives on Steel Corrosion in HCL Media

Leila Herrag, Belkheir Hammouti, Abdelouahad Aouniti, Sghir El Kadiri, Rachid Touzani

Laboratoire de Chimie Appliquée et Environnement, Faculté des Sciences, B.P. 717, 60 000 Oujda, Morocco,
Tel: +212 36 500602,
Fax: +212 36 500603;
E-mail: hammoutib@yahoo.fr

Abstract
Some diamine compounds have been tested as corrosion inhibitors on steel in 1 M hydrochloric acid. The study is carried
out using weight loss measurements. Results obtained show that the inhibition efficiency (E %) increases with concentration.
The effect of carbon chain length between the two amino groups shows that the efficiency increases with the
number of –CH₂. A correlation between quantum energies and efficiency is obtained. Adsorption of inhibitors on the
mild steel surface in 1 M HCl follows the Langmuir isotherm model.

Keywords: diamine; steel; hydrochloric acid; corrosion; inhibition.