TEM and IBA study of the thermal oxidation of V following high dose He implantation

International audienc

Porous anodic alumina growth in borax electrolyte.

International audienceIon beam analysis and electron microscopy have been employed to investigate the formation of anodic films on aluminum in a borax electrolyte under potentiostatic conditions. The results indicate the initial growth of a barrier film, containing boron species, followed by growth of boron-free alumina, containing pores. The efficiency of porous film formation is similar to 45%, owing to the loss of Al3+ species to the electrolyte. O-18 tracer is retained in the film as pores develop, which is suggested to be related to the inward transport of the O2- ions in the growing alumina. In contrast, boron species are lost from the film, which is attributed to the field-assisted dissolution of the alumina as pores develop in the boron-containing region. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.001301jes] All rights reserved