Abstract:

The electrochemical study was presented on the process of a rare-earth Ti-alloy anodic oxidation. The formation of a rare-earth Ti-alloy anodization film was studied. At different concentrations of sulfuric acid and different applied voltages, the variation of electrochemical parameters was analyzed respectively. The process of rare-earth Ti-alloy anodization was discussed, based on the variation of the current density. With the analysis of SEM micrograph of the oxide film and other electrochemical parameters, the construction of the oxide film by layers was presented. The process of the formation and the conductive tissue of the rare-earth Ti-alloy anodization film were investigated by studying the variation of the potential at a certain temperature and applied voltage. A model of the formation of the rare-earth Ti-alloy anodization film was described. The film was composed of the porous layer and the compact layer with semiconductivity as well as capacity. The conduction current of rare-earth Ti-alloy anodization included hole conduction, ion Ce conduction and electrolyte ions conduction.

Key words: tita nium a lloy, r are ear th, ano diza tio n, ox ide film, electro chemistr y