Ultra-slow growth rate: Accurate control of the thickness of porous anodic aluminum oxide films

Wu, Jingcheng; Li, Yi; Li, Zhengxiang; Li, Shize; Shen, Le; Hu, Xing; Ling, Zhiyuan

doi:10.1016/j.elecom.2019.106602

Cited by 29 publications

(17 citation statements)

References 38 publications

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“…Это говорит о том, что динамический процесс эволюции анодированного слоя протекает не только на границе слоя Келлера и слоя Томпсона, как предполагал Томпсон [19], но также и на границе слой Келлера-металл. При дальнейшем анодировании на поверхности металла образуются углубления [20,21].…”

Section: результаты и их обсуждениеunclassified

Manufacturing of nanopillar (ultra-dispersed) catalytically active materials through chemical engineering

Antropov

Zaytsev

Ryabkov

et al. 2021

Fine Chem. Technol.

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Objectives. Catalytically active materials are required in different chemical engineering processes. This makes the development of new materials with high efficiency and original ways in which to obtain them of significant interest. The present work investigates the synthesis of catalytically active material including electrode materials, as well as their improved efficiency due to the nanodecoration of their surface.Methods. An aluminum folio was nanoperforated (nanoscalloped) by high-voltage anodization in an acidic medium. The effective electrode material was obtained as a metallic nickel replica rather than an oxide layer of the product. To study the surface state of aluminum obtained in this manner, a scanning electron microscope (Hitachi-SU8200) was used. The elementary composition of the aluminum was determined by back-scattered X-ray irradiation.Results. The nickel replica obtained in the above-described process exceeded the catalytic activity estimated by methanol oxidation of the unprocessed nickel 70–150 times.Conclusions. The present paper demonstrates the potential of creating effective catalytically active nanopillar materials using the metallic rather than metal-oxide part of a layer of anodized aluminum as a matrix template.

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Section: результаты и их обсуждениеunclassified

Manufacturing of nanopillar (ultra-dispersed) catalytically active materials through chemical engineering

Antropov

Zaytsev

Ryabkov

et al. 2021

Fine Chem. Technol.

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Section: Introductionmentioning

confidence: 99%

Military Type III Anodizing: The Optimal Limit Within Hardening Process of Aluminium Alloy in a Near Zero Temperature

Adyono¹,

Lestari²,

Endahwati³

2021

Proceedings of the 2nd Borobudur International Symposium on Science and Technology (BIS-STE 2020)

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Hard anodization was a method that can enhance aluminium alloy surface characteristics by growing an aluminum anodic oxide (AAO) film on it surface. This method was very applicable to obtain a thick and hard coating. This process was carried out at galvanostatic-potentiostatic mode at high current densities (j = 4.2 A/dm2), high target voltages (Vt = 30-60 V) and low electrolyte temperature. Two sulfuric acid electrolyte was compared, the first solution was sulfuric acid 11% vol., the second one was sulfuric acid 11% vol. plus oxalic acid 1% wt, both of them was conditioned at <5°C. The maximum AAO film thickness and hardness obtained was 110.01 µm and 400 HV. The increasment of target voltage was directly proportional to the increase in thickness and hardness of the AAO film. The results of this study could be synergized with the manufacturing process of aluminum alloy-based (Al6061) components at the product finishing stage. The logarithmic regression in the function of target voltage could be used to estimate film thickness and hardness of the films.

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“…The optimization study showed that the optimum anodization conditions (Telectrolyte ≤ 5.7 °C, j = 3 A/dm 2 , Csulfur = 1,4 M) resulted in a high AAO growing rate (0.86 μm/min) and a high film density (3.12 g/cm 2 ). Wu et al, (2019) found that two-step anodization could effectively widen the applications of AAO films, either as highprecision nanoporous templates or as ultrathin functional materials. ICESET 2020 97 This study was a surface treatment that refers to the galvanostatic-potentiostatic mode by Chu et al, (2005) and Schwirn et al, (2008) as an electrical setup during the anodization process.…”

Section: Introductionmentioning

confidence: 99%

Hard Anodize of 6061-T0 Aluminium Alloy in Sulfuric Acid Bath at Near Zero Temperature and Its Mechanical Properties

Adyono

Lestari

2020

Nusantara Science and Technology Proceedings

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Hard anodization was a method that can enhance aluminium alloy surface characteristics by growing an aluminum anodic oxide (AAO) film on it surface. This method was very applicable to obtain a thick and hard coating with a small amount of treatment time. This process was carried out at a high current density and low electrolyte temperature. Galvanostatic-potentiostatic mode at high current densities (j = 4.2 A/dm2) and high target voltages (Vt =30 -60 V) was used in this study. Two sulfuric acid electrolyte was compared, the first solution was sulfuric acid 11% vol., the second one was sulfuric acid 11% vol. plus oxalic acid 1% wt, both of them was conditioned at >5°C. The maximum AAO film thickness and hardness obtained was 110.01 µm and 400 HV. The increasment of target voltage was directly proportional to the increase in thickness and hardness of the AAO film.

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Ultra-slow growth rate: Accurate control of the thickness of porous anodic aluminum oxide films

Cited by 29 publications

References 38 publications

Manufacturing of nanopillar (ultra-dispersed) catalytically active materials through chemical engineering

Manufacturing of nanopillar (ultra-dispersed) catalytically active materials through chemical engineering

Military Type III Anodizing: The Optimal Limit Within Hardening Process of Aluminium Alloy in a Near Zero Temperature

Hard Anodize of 6061-T0 Aluminium Alloy in Sulfuric Acid Bath at Near Zero Temperature and Its Mechanical Properties

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