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The present paper aims to investigate the electrodeposition on steel substrate and the corrosion behavior of Zn-TiO 2 nanocomposite coatings. Zn-TiO 2 composite coatings were electrodeposited on OL 37 steel from an electrolyte containing ZnCl 2 , KCl, HBO 3 (pH 5.7) brightening agents and dispersed nanosized TiO 2 . Corrosion measurements were performed in 0.2 g L -1 (NH 4 ) 2 SO 4 solution (pH 3) by using electrochemical methods (open-circuit potential measurements, polarization curves, electrochemical impedance spectroscopy). The results of electrochemical measurements were corroborated with those obtained by using non-electrochemical methods (X-ray diffraction, atomic force microscopy and scanning electron microscopy). The results indicate that the composite coatings exhibit higher corrosion resistance as compared to pure Zn coatings and a non-linear dependence of their polarization resistance on TiO 2 concentration in the plating bath was found. The importance of TiO 2 nature and concentration regarding the properties of the composite coatings was demonstrated.

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