In this study, the effect of thermal oxidation temperature on Ti6Al4V alloy anodized coatings by the corrosion response was assessed through the potentiodynamic, open-circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) tests in 3.5% NaCl solution. Optical microscopy and scanning electron microscopy were used to study and correlate the microstructural evolution with the analysis of corroded regions. Digital image analysis provides to estimate temperature increases in the porous layer of TiO2 arising in increased corrosion resistance. The results over TiOX560° condition were presented an increased corrosion resistance compared to the base metal and other conditions. From digital image processing could be estimated possible growth of the porous layers rich in TiO2 increasing corrosion resistance of the heat-treated samples regarded to the base metal. Keywords: Ti6Al4V, EIS, TiO2, Corrosion, Image analysis