Abstract
The process in which aluminium covered with a porous layer is re-anodized to obtain a compact layer is known as the pore-filling method. The purpose of this work was to study the relationship between anodizing conditions and the structure of the porous anodic film on aluminium by application of the pore-filling method. In a first series of experiments the influence of the anodization voltage on the porosity was examined. It was found that the inverse of the porosity is a function of the square root of the anodization voltage. The second part of our investigations consisted in studying the dependence of the thickness of the barrier layer on the anodization voltage. At each stage of the anodization process this barrier layer thickness is a function of the anodization voltage. Moreover, there is some evidence of a variation in the thickness of the barrier layer during an anodization process performed at a constant voltage.
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