Conditions for transition from barrier to porous oxidation of aluminum in phosphoric acid solutionsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 19 декабря 2017 г.
Аннотация:Anodic oxidation of aluminum foil specimens in the phosphoric acid solutions of various concentrations
was studied under the galvanostatic conditions at various current densities. The efficiency of barrier
oxidation was determined by the slopes of linear portions of time dependence of voltage across the
electrochemical cell electrodes. The SEM micrographs of oxidized specimens are presented. It was shown
that the critical oxidation efficiency for the transition from the barrier oxidation to porous oxidation is
equal to the reciprocal of the Pilling–Bedworth ratio (0.61). The power dependence of the rate of
field
assisted ejection of metal cations from oxide
film on the current density was supported experimentally.
The exponent of power function was found to be about 0.5.