Zaraska Leszek, Szuwarzyński Michał, Świerkula Aleksandra, Brzózka Agnieszka
Faculty of Chemistry, Department of Physical Chemistry and Electrochemistry, Jagiellonian University, Gronostajowa 2, Krakow 30-387, Poland.
Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, A. Mickiewicza 30, Krakow 30-059, Poland.
ACS Omega. 2023 Sep 15;8(38):34564-34574. doi: 10.1021/acsomega.3c03412. eCollection 2023 Sep 26.
The conditions applied during the electrochemical polishing of aluminum were found to be important parameters for the successive formation of nanoporous alumina films. First, a high-purity Al foil was electrochemically polished in an aqueous solution containing CHOH and HClO at various sets of conditions, such as applied potential (5-35 V), temperature (0-20 °C), and process duration (10-180 s). Extensive studies of the topography of Al after polishing by scanning electron microscopy and atomic force microscopy allow verification of the correlations between conditions applied during the substrate pretreatment and dimensions of the nanopatterns generated on the metal surface. Next, Al polished samples at two different sets of conditions were used as starting materials for anodization. Unpolished Al samples were also anodized for reference. It was confirmed that electropolishing conditions do not significantly affect the oxide growth rate during anodization and the efficiency of anodic film formation. On the contrary, it was proved that the dimensions of the surface texture formed during Al polishing significantly affect the morphology and pore order within the anodic film. Therefore, it can be stated that it is possible to tune to some extent the arrangement of nanochannels within anodic aluminum oxide films by simply changing conditions during the electropolishing procedure..
研究发现，铝的电化学抛光过程中所采用的条件是后续形成纳米多孔氧化铝膜的重要参数。首先，将高纯度铝箔在含有CHOH和HClO的水溶液中于不同条件下进行电化学抛光，这些条件包括施加电位（5 - 35V）、温度（0 - 20°C）和处理持续时间（10 - 180s）。通过扫描电子显微镜和原子力显微镜对抛光后铝的形貌进行广泛研究，从而验证在基材预处理过程中所施加的条件与金属表面生成的纳米图案尺寸之间的相关性。接下来，将在两组不同条件下抛光的铝样品用作阳极氧化的起始材料。未抛光的铝样品也进行阳极氧化作为参考。结果证实，电化学抛光条件对阳极氧化过程中的氧化物生长速率和阳极膜形成效率没有显著影响。相反，事实证明，铝抛光过程中形成的表面纹理尺寸对阳极膜内的形态和孔序有显著影响。因此，可以说通过简单改变电化学抛光过程中的条件，在一定程度上可以调节阳极氧化铝膜内纳米通道的排列。
