Forming of porous alumina with tubular structure by anodizing in meniscal region

A simple method to fabricate a porous alumina layer at high forming current densities has been developed. This method allows carrying an anodic process of aluminium film dipping into the electrolyte in the meniscal part with forming current density up to 1500 mA/cm 2 and anodising rate up to 70 µm/min. The structure of the porous alumina formed has been found to be self-organized nanotube cells for anodizing current densities more than 100 mA/cm 2 .