کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
219320 463264 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-field anodization of aluminum in concentrated acid solutions and at higher temperatures
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
High-field anodization of aluminum in concentrated acid solutions and at higher temperatures
چکیده انگلیسی

Previous studies suggested that high-field anodization of aluminum could be realized only in relatively dilute acid at a low temperature to avoid the occurrence of undesired breakdown during anodization process. According to the model of avalanche breakdown, we proposed that the key to preventing the breakdown is to reduce the barrier-layer thickness of porous anodic alumina (PAA). Since the barrier-layer thickness of PAA decreases with increasing the acid concentration and temperature, the breakdown phenomenon during high-field anodization should not be occurred in concentrated acid solutions and at higher temperatures. Anodization behaviors of aluminum in concentrated oxalic acid solutions and at higher temperature were studied in detail. The results indicated that in the oxalic acid solutions of higher concentrations (>0.3 M) and at higher temperatures (16–40 °C), stable high-field anodization can be realized without the occurrence of breakdown and well-ordered PAA films can be available. Moreover, the well-ordered PAA film can be obtained even without stirring of the electrolyte. Our findings offer not only a simple and fast fabrication process of PAA templates but also an opportunity to fully understand the breakdown and the self-ordering mechanism during the growth of PAA.


► The electrical breakdown can be avoided by reducing the barrier-layer thickness.
► High-field anodization is realized at room temperature in concentrated solutions.
► The interpore distance is proportional to the final anodization voltage.
► The increase of current density cannot improve the degree of ordering of nanopores.
► We find a simple but fast fabrication method of porous anodic alumina templates.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 673, 15 May 2012, Pages 24–31
نویسندگان
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