Abstract
Surface enhanced Raman (SER) spectra were acquired continuously with time during the galvanostatic reductive dissolution of the passive film grown on iron in borate buffer (pH 8.4) by anodic polarization at one of three different potentials, +1000, +600, and 0 mV (SCE). Complementary measurements of the SER spectra of the passive film were made during the formation of the film by galvanostatic anodic polarization. The results indicate that the passive film consists of a layered structure with at least two components. The inner layer is most likely and the outer layer is primarily an Fe(III) species with an SER spectrum that is characterized by an intense, broad peak centered in the range . The outer layer may also contain that is associated with an SER spectroscopy peak at . © 1999 The Electrochemical Society. All rights reserved.
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