Thin passive films on titanium formed by electrolytic oxidation show a high relative permittivity and could be a promising cost effective dielectric material for capacitor applications. In the present work, the films were formed in an acetate buffer solution by potentiodynamic polarisation up to various potentials. The film thickness was determined by coulometry and ellipsometry. The growth factor is 2.7 nm/V. Furthermore, by using an electrochemical micro-capillary cell the anodising process was performed at high lateral resolution on different substrate grains with various crystallographic orientations. An influence of the Ti grain orientation on the TiO 2 film thickness could not be observed under the used experimental conditions. By means of transmission electron microscope(TEM) investigation the oxide film structure could be determined as prevailing amorphous.
Cover: The cover shows an illustration of the experimental set up for in‐situ investigations of the anodic metal dissolution under ECM conditionsA specially designed channel flow cell is placed under an optical microscope with long distance lens. A gold disc with a small conical glass lens in the centre is embedded in the glass lid of the channel flow cell and works as cathode. The sample is placed beneath the cathode and works as anode. The gap width of the channel amounts 0.35mm. A maximum electrolyte flow rate of 12.3m/s was realized. The anodic dissolution was carried out by current controlled pulses. The test assembly allows the observation of the surface topography development of the anode as well as possible interface reactions (e.g. gas evolution). More detailed information can be found in: M. Schneider, S. Schroth, N. Schubert, A. Michaelis, In‐situ investigation of the surface‐topography during anodic dissolution of copper under near‐ECM conditions, Materials and Corrosion 2012, 63, 96.
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