Conditions for self-ordering of porous structure of anodic aluminum oxide in weak and strong acidsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 29 декабря 2018 г.
Аннотация:The model, which under certain assumptions enables one to predict the conditions for self-ordering of
porous anodic oxide film (AOF) on aluminum in the weak and strong acids, is proposed. The work is a
development of the theory of concentration changes in the growing oxide pores proposed by Patermarakis
et al. The most important difference from the theory is the consideration of the second-stage
dissociation of strong acids. The problem of the conditions of self-organization of porous AOF on
aluminum is solved analytically. The critical porosity Ps and the corresponding anodizing voltage Vr that
provides the optimal self-organization of porous structure of AOF are interpreted. Close values of Vr and
the breakdown voltage VBP are explained. Using the model, the critical porosity Ps for solutions of weak
monobasic acids and strong dibasic acids with low second-stage dissociation constant is calculated and
the effect of various factors on the critical porosity Ps is determined. The obtained results give an answer
to the question why all activating anions, which cause pitting dissolution, are the anions of strong
monobasic acids.