Abstract
Mechanism of the formation of pores in the anodic oxide films on Al in sulfuric acid solution was studied by electron microscopic examination of the films in the stage of the increase of anode potential with anodizing time.The results obtained were summarized as follows.1) Anodic oxide coatings, formed in sulfuric acid solution when the anode potential was still increasing during electrolysis, appeared to have rough surfaces with no pores.2) Only a few pores were observed in the coatings at near the maximum anode potential. Initial formation of pores in the coatings was observed at the intersecting point of the ridges of oxide layers. It was also observed that these pores comprised unit cells which always had surfaces more convex than those of the pore-free oxide.3) In the region of potential beyond the maximum point on the curve, the formation of pores in the oxide was found at the intersecting point of the ridges of oxide layers and also on the ridges.
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