Abstract
By analysis of transport number and F—log j data for valve metals under galvanostatic anodization, obedience is found to the kink dependent Cabrera—Mott equation for irreversible transfer of metal ions from metal to oxide and to the defect dependent high-field ion migration equation for transport of both metal and oxygen ions in the growing anodic film. For Al, the kink and defect dependences are d log s/d log j = 0.5 and d log N/d log j approaching 0.67 at low current densities (oxygen ion transport) and 0.5 at high ones (metal ion transport), and the ion transfer valence is n = 3. The denser is the oxygen packing in the oxide, the higher is the electric field needed to drive a given ionic current through it.
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