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International Journal of Corrosion
Volume 2012, Article ID 301392, 8 pages
Research Article

Study of Zn-Ni Alloy Coatings Modified by Nano-SiO 2 Particles Incorporation

1Unit of Research “COPROMET” ENIT, University of Tunis-El Manar, BP 371002 Belvedere, Tunisia
2Institut UTINAM, CNRS UMR 6213, Équipe Sonochimie et Réactivité des Surfaces, Université de Franche-Comté, 16 Route de Gray, 25030 Besançon Cedex, France

Received 5 August 2011; Accepted 20 November 2011

Academic Editor: F. J. M. Pérez

Copyright © 2012 Olfa Hammami et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The aim of this research work was to codeposit nano-SiO2 particles into Zn-Ni alloy coatings in order to improve some surface properties. It had been investigated the effect of loading the plating bath with nanoparticles on composition, morphology, phase structure of deposits, and their subsequent influence on the corrosion process in corrosive solution of 3% NaCl and the thermal stability of deposits at C. It was found that Zn-Ni alloy composites contain a higher percentage of Ni with incorporation in the deposit of 1.54% of silica. X-ray diffraction measurements revealed that the alloys consisted of two phases, pure zinc and phase. Electrochemical characterization of the composites had been carried out through potentiodynamic polarization and electrochemical impedance spectroscopy. The composites exhibited higher values of microhardness and better corrosion resistance in corrosive media.