Electrokinetic currents generated in a roller bearing and a simulated journal bearing, and corrosive wear caused by these currents, are investigated in this paper. This study is a follow-up to findings of electrokinetic corrosion and mitigation thereof in commercial jet airplane hydraulic system control valves. Electrokinetic current densities were measured in the bearings that approximately agreed in shape and magnitude with a previously derived predictive equation. As expected, the dc current generated in a simulated journal bearing caused corrosion that was in accord with prior corrosive wear in the airplane valves. AC current pulses generated in the roller bearing were largely consumed in charge/discharge of the electrochemical double layer rather than corrosion. Electrokinetic corrosion is not generally recognized in lubricated systems and deserves some attention. (c) 2006 The Electrochemical Society.