BREAKDOWN BEHAVIOUR DURING REANODIZATION OF THICK POROUS ANODIC ALUMINA IN AQUEOUS AND NON-AQUEOUS SOLUTIONS

A comparative study towards reanodization of thick (22 µm) porous anodic alumina coatings in aqueous and non-aqueous electrolyte solutions is performed. The kinetics of pore-filling and breakdown characteristics dur ing reanodization demonstrate unanticipated development such as some persistence in voltage growth in aqueous environment and extremely sharp voltage drop at breakdown threshold in non-aqueous one. These findings could be most probably assigned to the irregular structure and complicated phase composition of thick porous coatings.