The influence of electrodeposited polypyrrole (Ppy) films on the corrosion behavior of aluminum and Al 2024-T3 alloy, particularly on the corrosion behavior of exposed metal in damaged areas of the film, has been investigated using the scanning vibrating electrode technique (SVET). Two types of experiments are described. In one type, the Ppy was electrodeposited directly on the metal, a defect through the Ppy coating to the metal surface was introduced, and SVET measurements were made in and around the defect area. In the other type of experiment, the Ppy coating was electrodeposited on indium-tin oxide (ITO) conducting glass and electrical connection to the metal substrate was made through a switch. The SVET was then applied to map the current density distribution on both the Ppy-coated ITO and on the metal substrate when the switch was either closed or open. Both types of experiments demonstrate that the Ppy alters the corrosion behavior of the metal substrate, with dissolved oxygen playing a significant role. We also present data on the influence of oxygen on the open-circuit potential of the Ppy films and on the discharge behavior of such films. The implications of these results are discussed. (C) 2004 The Electrochemical Society.