Amidopoly Ethylamines as Corrosion Inhibitors for Zinc Dissolution in Different Acidic Electrolytes

M. Abdallah,^* A.Y. El-Etre, M.F. Moustafa

Department of Chemistry, Faculty of Science, Benha University, Benha, Egypt

 

Received 10 June 2009; accepted 7 October 2009

 

Abstract

The effect of some amidopoly ethylamine, with different numbers of ethylamine units, on the corrosion of zinc electrode in ZnCl₂, NH₄Cl and (ZnCl₂ + NH₄Cl) electrolytes has been studied using galvanostatic polarization measurements. The inhibition efficiency was found to increase with increasing concentration, number of ethylamine units per molecule and with decreasing the temperature. Inhibition is explained on the basis of adsorption of amidopoly ethylamine molecules on the zinc electrode surface through their ethylamine groups. The inhibitors are adsorbed on the zinc electrode surface according to Langmuir adsorption isotherm. Some thermodynamic parameters are calculated and explained for the tested systems from the data obtained at different temperatures.

Keywords: zinc, corrosion inhibitors, amidopoly ethylamine, ZnCl₂, NH₄Cl, adsorption.

 

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^*Corresponding author. E-mail address: metwally552@hotmail.com