Abstract
The films formed on chromium in the passive and transpassive regions in borate buffer (pH8.4) were investigated by a combination of cyclic polarization and in situ EQCM and SERS. In the passive region, chromium dissolves as well as forms a passive film. The passive film thickness increases slowly with potential (approximately 6Aå/V). At low passive potentials, the identity of the film is not yet known. At high passive potentials the film is very similar to Cr2O3. In the transpassive region chromium forms a thick Cr(III) film, tentatively identified as Cr(OH)3, plus two Cr(VI) species. Significant changes occur to the passive film when the sample is removed from the aqueous solution and exposed to air.
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