The goal of this work was to test for the occurrence of the current X resistance (IR) voltage form of crevice corrosion in a corrosion-resistant alloy. Crevice corrosion occurred immediately (prior to a change in the solution composition) in alloy T-2205 duplex stainless steel exposed to an acidic-chloride media. This was indicated by the immediate, large (mA) measured current, large (0.5 V) measured electrode potential, E(x), profile and polarization curve on the crevice wall, and in situ visual observation of ie corrosive attack on the part of the crevice wall that was in the active peak region of its polarization curve. Thus, these results show that the IR voltage and the resulting active peak E(x) values on the crevice wall were entirely responsible for stabilizing the crevice corrosion process in this spontaneously active metal/electrolyte system.