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A study of tetrazoles derivatives as corrosion inhibitors of copper in nitric acid

M. Mihit (Laboratoire de Chimie – Physique, Equipe de Chimie Moléculaire & Corrosion, Faculté des Sciences d'Agadir, Agadir, Morocco)
R. Salghi (Laboratoire de l'Environnement et Sciences de l'Eau, Ecole Nationale des Sciences Appliquées d'Agadir, Agadir, Morocco)
S. El Issami (Laboratoire de Chimie – Physique, Equipe de Chimie Moléculaire & Corrosion, Faculté des Sciences d'Agadir, Agadir, Morocco)
L. Bazzi (Laboratoire de Chimie – Physique, Equipe de Chimie Moléculaire & Corrosion, Faculté des Sciences d'Agadir, Agadir, Morocco)
B. Hammouti (Laboratoire de Chimie des Eaux et Corrosion, Faculté des Sciences, Oujda, Morocco)
El. Ait Addi (Laboratoire de Chimie – Physique, Equipe de Chimie Moléculaire & Corrosion, Faculté des Sciences d'Agadir, Agadir, Morocco)
S. Kertit (Ecole Supérieure d'Optique, ESOA, Rabat, Morocco)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 1 May 2006

525

Abstract

Purpose

To evaluate the effect of some tetrazole compounds as corrosion inhibitors of copper in HNO3 at various temperatures.

Design/methodology/approach

1‐phenyl‐5‐mercapto‐1,2,3,4‐tetrazole (PMT) was selected as the best inhibitor among the tetrazole compounds tested. Gravimetric and electrochemical techniques were conducted.

Findings

PMT was an excellent inhibitor for copper in acid. Its efficiency attained 97.5 per cent and decreased slightly with temperature.

Research limitations/implications

The inhibition efficiency increased with the concentration of PMT to reach 97.5 per cent at 10−3 M. Good agreement between the various methods explored was observed. Polarisation measurements also showed that PMT acted as a mixed inhibitor.

Practical implications

The efficiency of PMT increased with the concentration but decreased with rise of temperature in the 298‐333 K range. As such, PMT could be used in chemical cleaning and pickling processes.

Originality/value

The originality of this work was the finding of an efficient inhibitor (PMT) having a nearly 100 per cent efficiency.

Keywords

Citation

Mihit, M., Salghi, R., El Issami, S., Bazzi, L., Hammouti, B., Ait Addi, E. and Kertit, S. (2006), "A study of tetrazoles derivatives as corrosion inhibitors of copper in nitric acid", Pigment & Resin Technology, Vol. 35 No. 3, pp. 151-157. https://doi.org/10.1108/03699420610665184

Publisher

:

Emerald Group Publishing Limited

Copyright © 2006, Emerald Group Publishing Limited

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