Abstract
The films formed on molybdenum by anodic oxidation in acidic chloride solutions at different potentials in the passive and transpassive region where characterized by ESCA. In order to deconvolute the measured 3d spectrum of molybdenum, a critical evaluation of standard spectra as given in the literature or as measured in the present study was necessary. MoO 2 and oxide films produced by electrochemical reduction of molybdate were used as standard materials. It was shown that molybdenum in anodic films is present as Mo 3+, Mo 4+, Mo 5+ and Mo 6+ and the fractions of the different valence states were determined at different anodic potentials. The passive film of molybdenum is about 2.5 nm thick and contains mostly Mo 3+, whereas Mo 6+ is the major species in transpassive films.
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