Impurity and temperature enhanced growth behaviour of anodic aluminium oxide from AA5052 Al-Mg alloy using hybrid pulse anodization at room temperature
| Autor: | C. H. Tsai, Chen-Kuei Chung, C. R. Hsu, I. C. Chung, Y. Chen, E. H. Kuo |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Anodizing General Chemical Engineering Alloy Metallurgy 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Corrosion Anode chemistry.chemical_compound Hydrolysis Chemical engineering chemistry Impurity Aluminium oxide engineering General Materials Science Growth rate 0210 nano-technology |
| Zdroj: | Corrosion Science. 125:40-47 |
| ISSN: | 0010-938X |
| DOI: | 10.1016/j.corsci.2017.05.027 |
| Popis: | 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 H 2 gas. The unique property of AAO from AA5052 is discussed. |
| Databáze: | OpenAIRE |
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