Anodic oxidation behaviour of Al-Ti alloys in acidic media

The anodic oxidation behaviour of Al-Ti alloys in several acidic solutions was investigated. The influence of conditions such as alloy composition, el ectrolytic solution, electrolyte temperature and formation current density on the formation rate of oxides on Al-Ti alloys and the dielectric properti es of the anodic films were analysed. It was shown that the oxide formation rate for the Al-Ti alloy containing 54 at % aluminium was the highest and the dielectric property of its anodic oxide was also the best. In addition, by means of several surface analytical techniques, the chemical compositio n of the films were determined as (TiO2)(n)(Al2O3)(m). AES (Auger electron spectroscopy) profiling analysis data showed that Al-Ti alloys had preferen tial oxidation behaviour, that is, the aluminium was oxidized preferentiall y.