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The formation of porous anodic alumina during potentiostatic anodizing of aluminium for times up to 900s has been investigated using two grades of chromic oxide reagent. The anodic films were examined by ion beam analysis and scanning and transmission electron microscopies. Sulphate impurity in the chromic acid led to incorporation of sulphate into the anodic film, a lower current density, a smaller...
The present study demonstrates the significant influence of ageing in the formation electrolyte on the morphology and composition of anodic films grown on zirconium in 0.35M ammonium fluoride in glycerol. Ageing after anodizing, by immersion in the electrolyte for 1h, is shown to promote a transition from a porous to a nanotubular morphology, due to the dissolution of the fluoride-rich intratubular...
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