Study of Ni-TiO2 nanocomposite coating prepared by electrochemical deposition

Abstract

Advances in materials performance often require the development of composite system. Nanocomposites containing
\ntitanium oxide nanoparticles in a nickel matrix have been prepared by means of electrocodeposition process from nickel
\nplating bath an sulphate bath. The nanocomposite coatings were obtained by codeposition of the TiO2 nanoparticles (mean
\ndiameter 21 nm) with nickel during plating process. The surface morphology and microstructure of the nickel matrix was
\nsignificantly altered due to the presence of titania nanoparticles. In the case of both nickel baths, the Vickers
\nmicrohardness showed a tendency to increase with the amount of particle incorporation. The corrosion behaviour of the
\nelectrodeposited nickel in 0.5M Na2SO4 and 0.5M NaCl was studied using electrochemical methods. The corrosion rate
\ncalculated by polarization potentiodynamic curves obtained after 30 min and 1 h from immersion in solution is bigger for
\nnanostructured coatings in 0.5M Na2SO4 (5.92 μm/year) and a little bit smaller in 0.5M NaCl (3.77 μm/year).