scholarly journals Porous Alumina Films Fabricated by Reduced Temperature Sulfuric Acid Anodizing: Morphology, Composition and Volumetric Growth

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 767
Author(s):  
Alexander Poznyak ◽  
Andrei Pligovka ◽  
Tsimafei Laryn ◽  
Marco Salerno
Keyword(s):  
Sulfuric Acid ◽  
Film Growth ◽  
Porous Alumina ◽  
Aluminum Foil ◽  
Solution Concentration ◽  
Alumina Film ◽  
Volumetric Growth ◽  
Alumina Films ◽  
Current Densities ◽  
Reduced Temperature

The volumetric growth, composition, and morphology of porous alumina films fabricated by reduced temperature 280 K galvanostatic anodizing of aluminum foil in 0.4, 1.0, and 2.0 M aqueous sulfuric acid with 0.5–10 mA·cm−2 current densities were investigated. It appeared that an increase in the solution concentration from 0.4 to 2 M has no significant effect on the anodizing rate, but leads to an increase in the porous alumina film growth. The volumetric growth coefficient increases from 1.26 to 1.67 with increasing current density from 0.5 to 10 mA·cm−2 and decreases with increasing solution concentration from 0.4 to 2.0 M. In addition, in the anodized samples, metallic aluminum phases are identified, and a tendency towards a decrease in the aluminum content with an increase in solution concentration is observed. Anodizing at 0.5 mA·cm−2 in 2.0 M sulfuric acid leads to formation of a non-typical nanostructured porous alumina film, consisting of ordered hemispheres containing radially diverging pores.

Microstructure Control of Porous Alumina Film Using Aqueous Sol Containing Trehalose

2007 ◽  
Vol 350 ◽  
pp. 7-10 ◽  
Author(s):  
Takeshi Miki ◽  
Kaori Nishizawa ◽  
Kazuyuki Suzuki ◽  
Kazumi Kato
Keyword(s):  
Porous Alumina ◽  
Dip Coating ◽  
Alumina Film ◽  
Coating Solution ◽  
Coating Technique ◽  
Glass Substrates ◽  
Alumina Films ◽  
Maximum Thickness ◽  
Alumina Particles ◽  
Dip Coating Technique

To fabricate porous and thick alumina films, we prepared an aqueous alumina hydroxide sol containing trehalose. The alumina films were deposited by dip-coating technique on glass substrates and heating at 500 °C. The maximum thickness of the film obtained by one-run dip-coating using the sol containing trehalose was over 1000 nm. The film was an aggregate of alumina particles with a diameter of 20-40 nm and pores were interstices between the particles. The porosity of alumina film can be controlled in the range of 48-65 % by changing trehalose concentration in the dip-coating solution.

Preparation of Porous Alumina by Anodization

2005 ◽  
Vol 23 ◽  
pp. 75-78 ◽  
Author(s):  
C.X. Xu ◽  
X.S. Zhang ◽  
X.W. Sun
Keyword(s):  
Sulfuric Acid ◽  
Oxalic Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Porous Alumina ◽  
Fabrication Process ◽  
Alumina Films ◽  
Anodization Process

The characteristics of porous alumina produced by anodization in both oxalic acid and sulfuric acid solution have been studied. The diameter of the pores for oxalic acid as electrolyte is about 60 nm and for sulfuric acid as electrolyte is about 30 nm. The morphologies of the pores have been improved by two-step anodization process. It has been observed that the temperature and operation voltage are two of the most important factors in the fabrication process of porous alumina films.

Preparation and Characterization of Porous Alumina Film Using Sol Containing PEG

2006 ◽  
Vol 320 ◽  
pp. 159-162 ◽  
Author(s):  
Takeshi Miki ◽  
Kaori Nishizawa ◽  
Kazuyuki Suzuki ◽  
Kazumi Kato
Keyword(s):  
Porous Alumina ◽  
Dip Coating ◽  
Poly Ethylene Glycol ◽  
Alumina Film ◽  
Glass Substrates ◽  
Alumina Films ◽  
Poly Ethylene ◽  
Dip Coating Technique ◽  
Hydrolysis Of

To obtain porous alumina films, the precursor sol was prepared by hydrolysis of Al isopropoxide and then mixing with poly(ethylene glycol) (PEG). The porous alumina films were fabricated by dip-coating technique on glass substrates and heating at 500 °C. The film was composed of nano sized particles (30-50 nm). The maximum thickness of the film prepared by one-run dip-coating was ca. 1000 nm. The film had humidity-sensitive electrical resistance at room temperature.

Embedded space charge in porous alumina films formed in phosphoric acid

2007 ◽  
Vol 53 (2) ◽  
pp. 300-304 ◽  
Author(s):  
I. Vrublevsky ◽  
A. Jagminas ◽  
J. Schreckenbach ◽  
W.A. Goedel
Keyword(s):  
Phosphoric Acid ◽  
Space Charge ◽  
Porous Alumina ◽  
Alumina Films

scholarly journals Protection of Aluminum Foils against Environmental Corrosion with Graphene-Based Coatings

2021 ◽  
Vol 8 ◽  
pp. 18-28
Author(s):  
George Paterakis ◽  
George Anagnostopoulos ◽  
Labrini Sygellou ◽  
Costas Galiotis ◽  
◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Sulfuric Acid ◽  
Inhibition Efficiency ◽  
Lithium Perchlorate ◽  
Aluminum Foil ◽  
Corrosion Performance ◽  
Acidic Conditions ◽  
Corrosion Inhibition Efficiency ◽  
Commercial Applications ◽  
Lower Corrosion Rate

Commercial aluminum foils were coated by graphene oxide, and its functionalized derivatives and the corrosion performance of the coated specimens were examined in acidic conditions (lithium perchlorate and sulfuric acid). Electrochemical experiments have shown that all graphene oxide-coated specimens provided up to 96% corrosion inhibition efficiency with a corresponding lower corrosion rate compared to the bare aluminum foil. Our results clearly show that graphene-related materials offer viable alternatives for the protection of aluminum, and this opens up a number of possibilities for its use in a number of commercial applications.

Effects of a magnetic field on growth of porous alumina films on aluminum

2010 ◽  
Vol 55 (13) ◽  
pp. 4180-4187 ◽  
Author(s):  
Adriana Ispas ◽  
Andreas Bund ◽  
Igor Vrublevsky
Keyword(s):  
Magnetic Field ◽  
Porous Alumina ◽  
Alumina Films
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