A theory is presented for the anodie oxidation of metals such a.s tantalum and Muminum. The theory of Mott and Cabrera has been extended to inelude effects of space charge on kinetics of the process in the highfield ease. The behavior of these systems is shown to depend critically on a dimensionless factor, 8, which is determined by the lattice and energy parameters and also by the experL mental conditions. For 8 very small, corresponding to small space charge, the kinetic equation reduces ~o

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... at of Mort and Cabrera. For large values of 8 a very similar equation results which, however, contains only the parameters of the bulk oxide. For intermediate values of 8, complex behavior is predicted. In particular, the temperature independence of Tafel slope observed for tantalum is shown to be a consequence of the theory for certain reasonable choices of the parameters. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 207.241.231.81 Downloaded on 2018-07-20 to IP