Zn-TiO2 and ZnNi-TiO2 Nanocomposite Coatings: Corrosion Behaviour
This work presents the corrosion behaviour of the as-prepared of Zn-TiO2 and ZnNi-TiO2 films in neutral Na2SO4 solution and a first attempt to correlate with their composition, morphology and structure. The films were prepared by galvanostatic pulse method onto steel electrodes, at room temperature. The X-ray diffraction study revealed that the ZnNi alloy consists of a homogenous Ni5Zn21 phase and that the preferred crystallographic orientation of Zn deposits changes in the presence of TiO2. The SEM results show that the morphology of the metallic coating is function of the metal phase composition and become more porous in the presence of 1.5 wt% TiO2.The corrosion parameters for the nanocomposite coatings were compared with those of pure Zn and ZnNi electrodeposits, and the ZnNi-TiO2 nanocomposite coating shows the less cathodic corrosion potential.
Luís Guerra ROSA and Fernanda MARGARIDO
A. Gomes et al., "Zn-TiO2 and ZnNi-TiO2 Nanocomposite Coatings: Corrosion Behaviour", Materials Science Forum, Vols. 636-637, pp. 1079-1083, 2010