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Oxide density distribution across the barrier layer during the steady state growth of porous anodic alumina films: Chronopotentiometry, kinetics of mass and thickness evolution and a high field ionic migration model

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National Technical University of Athens   

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Digital Library of National Technical University of Athens | Dspace@NTUA   

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Oxide density distribution across the barrier layer during the steady state growth of porous anodic alumina films: Chronopotentiometry, kinetics of mass and thickness evolution and a high field ionic migration model (EN)
Patermarakis, G (EN)
Masavetas, K (EN)
Karayianni, H (EN)
Chandrinos, J (EN)
journalArticle (EN)
2014-03-01T01:31:37Z
2009 (EN)
The steady state growth of porous anodic alumina films in oxalate solutions at various conditions was studied by chronopotentiometry, mass balance and optical microscopy methods enabling determination of consumed Al, film mass and thickness, current efficiencies, Al3+ and O2- transport numbers across barrier layer, etc. The film thickness growth rate was found to be proportional to O2- anionic current. A high field ionic migration model was developed. It predicted that, during anodising, the local oxide density across barrier layer rises from 2.6 in Al|oxide to 4.59-5.22 g cm-3 in oxide|electrolyte interface with mean value ≈3.21-3.52 g cm-3. The field strength rises from the first to second interface. The mechanism of Al oxidation near the Al|oxide interface embraces the transformation of the Al lattice to a transient, rare oxide one sustained by field with comparable Al3+ spacing parameter. The oxide near the Al|oxide interface and around the density maximum in the oxide|electrolyte interface are under different levels of electro-restriction stresses. During relaxation, the oxide behaves like a solid-fluid material suppressing the initial density distribution. © 2008 Springer-Verlag. (EN)
Electrochemistry (EN)
Anodising (EN)
Oxide density spectrum (EN)
Aluminum (EN)
Ionic migration (EN)
Field strengths (EN)
Mass balance (EN)
Porous anodic alumina (EN)
Optical microscopy (EN)
Fluidity (EN)
Oxide films (EN)
High field (EN)
Fluid materials (EN)
Growth kinetics (EN)
Initial density (EN)
Aluminum sheet (EN)
Density maxima (EN)
Mean values (EN)
Barrier layers (EN)
Electrolyte interfaces (EN)
Porous anodic alumina films (EN)
Steady state (EN)
Film growth (EN)
Oxide interfaces (EN)
Al to oxide lattice transformation (EN)
Growth mechanism (EN)
Current efficiency (EN)
Chronopotentiometry (EN)
Electrolytes (EN)
Density distributions (EN)
Transport number (EN)
Alumina (EN)
Journal of Solid State Electrochemistry (EN)
Αγγλική γλώσσα
SPRINGER (EN)
National Technical University of Athens
Digital Library of National Technical University of Athens | Dspace@NTUA
Κεντρική Βιβλιοθήκη Ε.Μ.Π.
Ιδρυματικό Αποθετήριο
Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά



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