Journal ArticleDOI
Structural Features of Oxide Coatings on Aluminum
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TLDR
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
Surface Wettability of Macroporous Anodized Aluminum Oxide
Josephus Gerardus Buijnsters,Rui Zhong,Natalia Tsyntsaru,Natalia Tsyntsaru,Jean-Pierre Celis +4 more
TL;DR: Practical guidelines for the synthesis of rough, highly porous AAO structures with controlled wettability are provided and the possibility of forming superhydrophobic surfaces is evaluated.
Journal ArticleDOI
Porous anodic alumina with continuously manipulated pore/cell size.
TL;DR: It is shown for the first time that continuous manipulation of the pore size of PAA can be realized, and the burning-down phenomena of the aluminum substrates can be avoided at relatively high voltage anodization.
Journal ArticleDOI
Individual Alumina Nanotubes.
TL;DR: Detailed studies by transmission electron microscopy revealed that the ANTs are completely detached cells of the porous anodized aluminum film.
Journal ArticleDOI
Corrosion protection of clad 2024 aluminum alloy anodized in tartaric-sulfuric acid bath and protected with hybrid sol–gel coating
Vera Rosa Capelossi,Vera Rosa Capelossi,M. Poelman,Isaline Recloux,R. P. B. Hernandez,H.G. de Melo,Marie-Georges Olivier +6 more
TL;DR: In this paper, a hybrid sol-gel coating was applied to an AA2024 T3 anodic film and the results showed that the treatment with the hybrid solgel increased resistive properties of the pores compared to the classical water sealing, delaying the access of aggressive species to the barrier layer.
Journal ArticleDOI
The sealing of porous anodic oxide films on aluminium
T.P. Hoar,G.C. Wood +1 more
TL;DR: In this paper, the process of sealing the porous oxide films produced on aluminium by anodic oxidation in sulphuric acid by heating them in nickel acetate solution, in dichromate and chromate solutions, and in distilled water has been studied by a.c.-bridge measurements of the electrical impedance of the film during sealing.
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