Behaviour of Brasses Corrosion in Nitric Acid with and without PMT

M. Mihit,^a M. Belkhaouda,^a L. Bazzi,^a R. Salghi,^b,* S. El Issami,^a E. Ait Addi^a

^a) Laboratoire Matériaux & Environnement, Equipe de Chimie Physique Appliquée, Faculté des Sciences, BP 8106, Agadir-Morocco.

^b) Laboratoire d'Ingénierie des Procédés de l’Energie et de l’Environnement, Ecole National des Sciences Appliquées d’Agadir, BP 1136, Agadir-Morocco

 

Received 30 January 2007; accepted 20 July 2007

 

 

Abstract

The comparative study of corrosion behaviour of brasses 70Cu30Zn and 60Cu40Zn in HNO₃ solution in absence and in presence of 1-phenyl-5-mercapto-1,2,3,4-tetrazole (PMT) was studied by gravimetric and electrochemical methods. Results obtained are in good agreement and reveal that the corrosion rate depends on immersion time and zinc content in the alloy. Copper and zinc losses from each specimen studied, at various immersion times, were estimated by Atomic Adsorption Spectroscopic analysis. This shows that the inhibition efficiency of the inhibitor towards copper is more significant than zinc. PMT was adsorbed preferentially on the copper surface and inhibits the process of corrosion of brasses in the nitric acid medium.

Keywords: brass, corrosion, inhibition, PM

 

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* Corresponding author. E-mail address: r_salghi@yahoo.fr , salghi@ensa-agadir.ac.ma