Abstract
Analysing the electrochemical impedance diagrams plotted in a large frequency range (10 −3 Hz10 4 Hz) enables to complete and support the dissolution—passivation scheme of titanium elaborated from steady state measurements. The analysis of the R t . I product (charge transfer resistance by stationary current) reveals the presence of two active dissolution paths in tervalen titanium, one of which depends on the presence of the hydride (TiH 2). Moreover it confirms the participation of the tetravalent oxide TiO 2 in the establishment of the stable passivity. A complete reaction model specifying the chemical nature of all the intermediates and final products is proposed.
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