The electrochemical behavior of titanium and two of its alloys in artificial saliva containing hydrogen peroxide (H2O2) was studied using open-circuit potential, polarization and electrochemical impedance spectroscopy measurements. The addition of H2O2 caused a decrease in the corrosion resistance and an enhanced dissolution/oxidation rate. Using a two-layer model of the oxide film, it was concluded that the addition of H2O2 made the inner layer more defective and the outer layer thicker and porous. Ti has more resistance to H2O2 than its alloys. This effect depends on the H2O2 concentration and the pH value of the solution. (c) 2005 Elsevier B.V. All rights reserved.