T he corrosion behavior of Re microelectrode in several aqueous solutions has been inferred from open circuit capacitance, C, and potential, E, measurements in the absence and presence of O 2 , at 25°C.Inspection of the steady-state potential, E st reveals that the metal surface is covered by an oxide film whose composition is likely to be ReO 2 .In all examined solutions except h 3 PO 4 , and Ch ...