Impurity and temperature enhanced growth behaviour of anodic aluminium oxide from AA5052 Al-Mg alloy using hybrid pulse anodization at room temperature

C. K. Chung; C. H. Tsai; C. R. Hsu; E. H. Kuo; Y. Chen; I. C. Chung

doi:10.1016/j.corsci.2017.05.027

Impurity and temperature enhanced growth behaviour of anodic aluminium oxide from AA5052 Al-Mg alloy using hybrid pulse anodization at room temperature

C. K. Chung, C. H. Tsai, C. R. Hsu, E. H. Kuo, Y. Chen, I. C. Chung

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Conventional anodic aluminium oxide (AAO) was formed using direct-current anodization from high-purity (99.99%–99.999%) Al foils at low 0–5 °C with a growth rate about 2–3 μm/h. Here, we investigate the greatly enhanced growth behaviour of AAO from AA5052 Al-Mg alloy (96.6%Al-2.6%Mg) at high 25 °C using hybrid-pulse anodization. The Mg-impurity and high-temperature enhanced growth rate of AAO at 25 °C is over three-fold to 9.7 μm/h; it also reduces the average pore size to 32.2 nm from 42.8 nm due to high-activity Mg hydrolysis releasing high Mg(OH)₂-formation heat and H₂ gas. The unique property of AAO from AA5052 is discussed.

Original language	English
Pages (from-to)	40-47
Number of pages	8
Journal	Corrosion Science
Volume	125
DOIs	https://doi.org/10.1016/j.corsci.2017.05.027
Publication status	Published - 2017 Aug 15

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Materials Science(all)

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10.1016/j.corsci.2017.05.027

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title = "Impurity and temperature enhanced growth behaviour of anodic aluminium oxide from AA5052 Al-Mg alloy using hybrid pulse anodization at room temperature",

abstract = "Conventional anodic aluminium oxide (AAO) was formed using direct-current anodization from high-purity (99.99%–99.999%) Al foils at low 0–5 °C with a growth rate about 2–3 μm/h. Here, we investigate the greatly enhanced growth behaviour of AAO from AA5052 Al-Mg alloy (96.6%Al-2.6%Mg) at high 25 °C using hybrid-pulse anodization. The Mg-impurity and high-temperature enhanced growth rate of AAO at 25 °C is over three-fold to 9.7 μm/h; it also reduces the average pore size to 32.2 nm from 42.8 nm due to high-activity Mg hydrolysis releasing high Mg(OH)2-formation heat and H2 gas. The unique property of AAO from AA5052 is discussed.",

author = "Chung, {C. K.} and Tsai, {C. H.} and Hsu, {C. R.} and Kuo, {E. H.} and Y. Chen and Chung, {I. C.}",

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T1 - Impurity and temperature enhanced growth behaviour of anodic aluminium oxide from AA5052 Al-Mg alloy using hybrid pulse anodization at room temperature

AU - Chung, C. K.

AU - Tsai, C. H.

AU - Hsu, C. R.

AU - Kuo, E. H.

AU - Chen, Y.

AU - Chung, I. C.

PY - 2017/8/15

Y1 - 2017/8/15

N2 - Conventional anodic aluminium oxide (AAO) was formed using direct-current anodization from high-purity (99.99%–99.999%) Al foils at low 0–5 °C with a growth rate about 2–3 μm/h. Here, we investigate the greatly enhanced growth behaviour of AAO from AA5052 Al-Mg alloy (96.6%Al-2.6%Mg) at high 25 °C using hybrid-pulse anodization. The Mg-impurity and high-temperature enhanced growth rate of AAO at 25 °C is over three-fold to 9.7 μm/h; it also reduces the average pore size to 32.2 nm from 42.8 nm due to high-activity Mg hydrolysis releasing high Mg(OH)2-formation heat and H2 gas. The unique property of AAO from AA5052 is discussed.

AB - Conventional anodic aluminium oxide (AAO) was formed using direct-current anodization from high-purity (99.99%–99.999%) Al foils at low 0–5 °C with a growth rate about 2–3 μm/h. Here, we investigate the greatly enhanced growth behaviour of AAO from AA5052 Al-Mg alloy (96.6%Al-2.6%Mg) at high 25 °C using hybrid-pulse anodization. The Mg-impurity and high-temperature enhanced growth rate of AAO at 25 °C is over three-fold to 9.7 μm/h; it also reduces the average pore size to 32.2 nm from 42.8 nm due to high-activity Mg hydrolysis releasing high Mg(OH)2-formation heat and H2 gas. The unique property of AAO from AA5052 is discussed.

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Impurity and temperature enhanced growth behaviour of anodic aluminium oxide from AA5052 Al-Mg alloy using hybrid pulse anodization at room temperature

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