Abstract: The electrochemical oxidation behavior and corrosion kinetics of pyrite in acidic media was investigated by cyclic voltammetry，polarization curves，Tafel curves and electrochemical impedance spectroscopy.The results show that pyrite is oxidized to FeS，which makes electrode passivated; as the potential continue to increase，pyrite is oxidized to Fe2+.The research of corrosion kinetics at different pH values and temperature shows that the corrosion current density decreases as pH values increase; the corrosion current density increases as the temperature rises.It furtherly indicates that  decreasing pH value or increasing temperature in the study range of pH value and temperature accelerates the corrosion process of pyrite.The study o f electrochemical impedance spectroscopy indicates controlling step of pyrite oxidation is different at different potentials，which is consistent with the result of cyclic voltammetry.

Key words: Pyrite, Electrochemistry, Acidic media