Porous anodic alumina formed by anodization of aluminum alloy (AA1050) and high purity aluminum

Zaraska, Leszek; Sulka, Grzegorz D.; Szeremeta, Janusz; Jaskuła, Marian

doi:10.1016/j.electacta.2009.12.054

Cited by 167 publications

(129 citation statements)

References 35 publications

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“…Optimized value of voltage was measured viz. 40 V. This value agrees with the voltage corresponding to self-ordered anodizing at constant current available in literature [21,22]. Therefore, anodization was carried out in electrolytic solution of 0.3 M oxalic acid at the voltage of 40 V at 5°C temperature.…”

Section: Measurement Of Current Density For Anodizationsupporting

confidence: 68%

Formation of self-ordered porous anodized alumina template for growing tungsten trioxide nanowires

et al. 2014

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Uniform porous anodized aluminum oxide (AAO) membrane has been synthesized by two-step anodization for fabricating tungsten trioxide (WO 3 ) nanowires. Under assayed conditions, uniform porous structure of alumina (Al 2 O 3 ) membrane with long range ordered hexagonal arrangements of nanopores was achieved. The self-assembled template possesses pores of internal diameter of 50 nm and interpore distance (d int ) of 80 nm with a thickness of about 80 lm, i.e., used for fabrication of nanostructures. WO 3 nanowires have been fabricated by simple electroless deposition method inside Al 2 O 3 nanopores. SEM images show tungsten trioxide nanowire with internal diameter of about 50 nm, similar to porous diameter of AAO template. XRD results showed that nanowires exist in cubic crystalline state with minor proportion of monoclinic phase.

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Section: Measurement Of Current Density For Anodizationsupporting

confidence: 68%

Formation of self-ordered porous anodized alumina template for growing tungsten trioxide nanowires

et al. 2014

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“…However, we observed that the surface of anodized Al low unfavorably influences the regularity ratio, circularity, and defects, which had been also observed by others. 29 Interestingly, the majority of nanopores of anodized Al low were found to consist of branched pores that had additional pores located near the main pore, which we attribute to defects formed during pore formation. Figure 1(b) shows a low-magnified SEM image of anodized Al low , with the branched pores shown in red.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, irregular directions of electric field have also been shown to be induced by impurities. 28,29 Based on the fact that the direction of electric field applied to aluminum substrate affects the geometry of pores, 37 pores with branched and meshed geometries found on the surface of anodized Al low could result from the irregular directions of the electric field (Figures 4(b) and 4(d), respectively). Moreover, irregular formation of pores on the surface of Al low could accelerate on increasing the applied potential as the strength of the electric field is increased.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] However, few studies have been conducted on the anodization of low-purity aluminum. [21][22][23][24][25][26][27][28][29] Fabrication of anodic alumina membranes from low-purity aluminum foil is not trivial and often requires specific conditions, different from those typically applied to the anodization of high-purity aluminum. 29 Herein, we use two different aluminum foils which are high purity (99.999%) and relatively low purity (99.8%) to fabricate a porous alumina membrane.…”

Section: Introductionmentioning

confidence: 99%

“…[21][22][23][24][25][26][27][28][29] Fabrication of anodic alumina membranes from low-purity aluminum foil is not trivial and often requires specific conditions, different from those typically applied to the anodization of high-purity aluminum. 29 Herein, we use two different aluminum foils which are high purity (99.999%) and relatively low purity (99.8%) to fabricate a porous alumina membrane. The anodization was preceded by two-step process 20 under same conditions in oxalic acid with 40 V. In phosphoric acid condition, aluminum was anodized at 190 V for the distinct divisions of two types of purity.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Aluminum Purity on the Pore Formation of Porous Anodic Alumina

Kim¹,

Lee

2014

Bulletin of the Korean Chemical Society

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Anodic alumina oxide (AAO), a self-ordered hexagonal array, has various applications in nanofabrication such as the fabrication of nanotemplates and other nanostructures. In order to obtain highly ordered porous alumina membranes, a two-step anodization or prepatterning of aluminum are mainly conducted with straight electric field. Electric field is the main driving force for pore growth during anodization. However, impurities in aluminum can disturb the direction of the electric field. To confirm this, we anodized two different aluminum foil samples with high purity (99.999%) and relatively low purity (99.8%), and compared the differences in the surface morphologies of the respective aluminum oxide membranes produced in different electric fields. Branched pores observed in porous alumina surface which was anodized in low-purity aluminum and the size; dimensions of the pores were found to be usually smaller than those obtained from high-purity aluminum. Moreover, anodization at high voltage proceeds to a significant level of conversion because of the high speed of the directional electric field. Consequently, anodic alumina membrane of a specific morphology, i.e., meshed pore, was produced.

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Tribocorrosion Characteristics of Hard Anodized Al Alloys on Hydrogen Valve Application for Fuel Cell Electric Vehicles

Shin,

Kim

2024

Adv Eng Mater

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In this study, the electrochemical and mechanical characteristics of 6061‐T6 aluminum alloy and hard anodized specimens were investigated after tribocorrosion experiments with rotational speed in dry, distilled water and sulfuric acid solution. The tribocorrosion experiments indicated that the corrosion potential of aluminum alloys and hard anodized specimens decreased with the initiation of friction/wear. In particular, the increase in the wear track width of an aluminum alloy and the exposure of the base material by completely destroying the anodized layers of the hard anodized specimens dramatically decreased the corrosion potential. Compared to the dry conditions, both the width and depth of damage in the distilled water and sulfuric acid solution increased dramatically. However, damage in the distilled water and sulfuric acid solutions did not present a significant difference. The results are attributed to the fact that the presence of fluid has a greater impact on damage degree in a material than corrosion. In particular, the brittleness and porosity of a hard anodized layer facilitates the impingement and penetration of fluid, making it relatively easy to generate and propagate cracks. These cracks accelerate the degradation and damage to the material by synergistic effects of wear and corrosion.This article is protected by copyright. All rights reserved.

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Porous anodic alumina formed by anodization of aluminum alloy (AA1050) and high purity aluminum

Cited by 167 publications

References 35 publications

Formation of self-ordered porous anodized alumina template for growing tungsten trioxide nanowires

Formation of self-ordered porous anodized alumina template for growing tungsten trioxide nanowires

Effect of Aluminum Purity on the Pore Formation of Porous Anodic Alumina

Tribocorrosion Characteristics of Hard Anodized Al Alloys on Hydrogen Valve Application for Fuel Cell Electric Vehicles

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