Abstract
Direct interpretation of the results of the two stage anodizing procedure suggests that the film formed in the molten salt developed both at the film/electrolyte interface by aluminum ion egress and at the film/substrate interface by oxygen-containing species, O2- and/or OH-, ingress. Either at the high current density or within the geometrically high field strength region, i.e. the pore base of the preformed porous film, sulphate ions migrate inwards into the film and move in the direction normal to the film/substrate interface. The thin preformed porous film formed in aqueous electrolyte can be employed as a marker to obtain the apparent transport numbers of aluminum and oxygen-containing ions during anodizing in the molten salt.
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