Journal ArticleDOI
Structural Features of Oxide Coatings on Aluminum
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In this paper, the structural features of the porous type of anodic oxide coating applied to aluminum have been investigated with the electron microscope, and formulas were given for calculating the cell size and pore volume of these coatings.Abstract:
The structural features of the porous type of anodic oxide coating applied to aluminum have been investigated with the electron microscope. These coatings consist of close‐packed cells of oxide, predominately hexagonal in shape, each of which contains a single pore. Pore size is a function of the electrolyte used and is independent of forming voltage. Wall thickness and barrier thickness are primarily a function of forming voltage and are affected to a minor degree by the electrolyte type. Pertinent dimensions of anodic coatings formed in sulfuric acid, oxalic acid, chromic acid, and phosphoric acid electrolytes are presented, and formulas are given for calculating the cell size and pore volume of these coatings.read more
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Journal ArticleDOI
Porous Anodic Films Formed on Aluminium in Chromic Acid
TL;DR: Anodic films have been formed at constant voltage in chromic acid under conditions which allow the formation of relatively thick porous films as discussed by the authors, and STEM/EDAX analysis of the cell walls of films, formed...
Journal ArticleDOI
The Morphology of Anodic Films Formed on Aluminium in Oxalic Acid
Geoff Bailey,G. C. Wood +1 more
TL;DR: In this paper, the authors show that if the forming voltage is allowed to rise during the anodizing run at constant current density, inversely funnelled pores are produced in which the pore diameter is smaller nearer the film surface than adjacent to the barrier layer.
Journal ArticleDOI
Synthesis of Tb3+-doped ZnO Nanowire Arrays Through a Facile Sol–Gel Template Approach
TL;DR: In this paper, Tb3+-doped zinc oxide nanowire arrays embedded in anodic alumina membranes (AAM) were fabricated by an improved sol-gel method.
Journal ArticleDOI
Mechanism of aluminium and oxygen ions transport in the barrier layer of porous anodic alumina films
G. Patermarakis,J. Diakonikolaou +1 more
TL;DR: In this article, the efficiencies of Al consumption and oxide production in the metal|oxide interface and the transport numbers of Al3+ and O2− in the barrier layer of porous anodic alumina films were determined.
Journal ArticleDOI
Effect of sulphate impurity in chromic acid anodizing of aluminium
TL;DR: In this article, the formation of porous anodic alumina during potentiostatic anodizing of aluminium for times up to 900 s has been investigated using two grades of chromic oxide reagent.
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