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
Degradation of the corrosion resistance of anodic oxide films through immersion in the anodising electrolyte
M. García-Rubio,M. García-Rubio,Pilar Ocón,Michele Curioni,George Thompson,Peter Skeldon,A. Lavía,I. García,I. García +8 more
TL;DR: In this article, the deterioration of AA2024, AA6061 and AA7475 anodised in an environmentally-compliant tartaric acid/sulphuric acid electrolyte has been examined as a function of the immersion time in the electrolyte after termination of anodising.
Journal ArticleDOI
Fabrication and Characterization of Single Phase α-Alumina Membranes with Tunable Pore Diameters.
TL;DR: The Young’s modulus and hardness of the single phase α-alumina membranes formed by heat treatment at 1250 °C were notably decreased compared to the corresponding amorphous membranes, presumably because of the nodular crystallite structure of the cell walls and the substantial increase in porosity.
Journal ArticleDOI
A growth pathway for highly ordered quantum dot arrays
TL;DR: In this paper, highly ordered InAs nanodot arrays were grown by molecular-beam epitaxy on non-lithographically nanopatterned GaAs, and approximately 20 billion dots were grown in a 1cm2 area with the smallest size dispersion ever reported and forming a lateral superlattice in hexagonal dense packing form.
Journal ArticleDOI
Impurity-driven defect generation in porous anodic alumina
TL;DR: In this article, the morphologies of porous anodic alumina films are affected significantly by the presence of small amounts of copper impurity in the aluminium substrate, resulting in generation of defects during anodizing in phosphoric acid over a wide range of conditions.
Journal ArticleDOI
On the mechanism of dissolution of porous oxide films on aluminium during anodizing
M. Nagayama,Kazuhisa Tamura +1 more
TL;DR: In this article, the dissolution rate of anodic oxide films on aluminium was investigated under the usual conditions of anodizing in 10% sulphuric acid solution by taking into account the accumulation of both Joule heat and the heat of formation of oxide at the pore-base and the outward conduction of heat through the solution-filled pore.
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