Free Access
J. Chim. Phys.
Volume 96, Number 5, May 1999
Page(s) 830 - 837
DOI: 10.1051/jcp:1999173

J. Chim. Phys. Vol. 96, N°5  p. 830-837

Polarization studies on zinc in hydrochloric acid solution containing some organic solvents

A.K. Mohamed

Chemistry Department, Faculty of Science, El-Mansoura University, El-Mansoura, Egypt

The corrosion behaviour of zinc metal in some organic solvents was tested electrochemically using galvanometric polarization measurements. The results showed that the studied organic solvents act as mixed type inhibitors. The inhibition was assumed to occur via physical adsorption of the inhibitor molecules fitting a Temkin's isotherm. The inhibition eficiency of the solvents increase in the order: glycerol >ethylene glycol >DMSO >dioxane. This order is not affected by the variation in temperature in the range $35-55~^{\circ}$C. The increase in temperature was found to increase the corrosion in absence and in presence of inhibitors. Some thermodynamic parameters for adsorption were also computed and discussed.

Le comportement de corrosion du zinc métallique dans certains solvants organiques a été testé électrochimiquement en utilisant les mesures de polarisation galvanométrique. Les résultats ont montré que les solvants organiques étudiés agissent comme des inhibiteurs de type mixte. L'inhibition semble se produire par l'adsorption physique des molécules inhibitrices selon une isotherme de Temkin. L'efficacité d'inhibition des solvants augmente dans l'ordre suivant : glycérol >éthylène glycol >DMSO >dioxane. Cet ordre n'est pas affecté par une variation de température dans l'intervalle compris entre 35 et 55  $^{\circ}$C. La corrosion augmente avec la température, en absence ou en présence d'inhibiteurs. Certains paramètres thermodynamiques d'adsorption ont été calculés et discutés.

Key words: Some organic solvents -- acid corrosion -- zinc

© EDP Sciences 1999

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