Abstract
Electrochemical impedance spectroscopy has been used as an erosion corrosion rate-monitoring technique. The Cu-Ni alloys used for this study were machined into cylinders and submitted to high speed rotation in a sodium chloride solution after an initial passivation period. The hydrodynamic behavior of the liquid environment on these rotating surfaces was analyzed and related to other geometries and conditions. Breakdown of the outer passivation film by erosion was easily observed for the 90-10 Cu-Ni alloy and for two 70-30 Cu-Ni alloys. A comparison ofI corr with the values of the freeE corr clearly indicated a time lag between those two components. This can best be explained by the existence of a concentration gradient of oxygen throughout the film thickness. The time domain of these phenomena is also indicative of solid state equilibrium.
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