Electrochemical impedance spectroscopy has been revealed to be a useful tool to evaluate the exposed surface area and consequently to evaluate the corrosion behavior of titanium foams intended for biomedical applications. In order to find the most accurate corrosion assessment, a new equivalent circuit involving a porous model in series with a double TiO2 layer model was proposed to fit the experimental data. Although seldom used in the literature, such technique could be useful for the characterization of porous media. Determining corrosion potentials and current densities, the titanium foams have revealed to be slightly more resistant to corrosion in simulated body fluid solutions at 37 degrees C under static mode (no stress applied to the samples) compared to dense and polished titanium. The best titanium foams exibited penetration rates around 0.07 mu m yr(-1). Cyclic voltammetry experiments have shown that the titanium oxide layer stability was not affected by the fabrication process of the foams. (c) 2005 The Electrochemical Society.