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首页> 外文期刊>Thin Solid Films >Fabrication of a plasma electrolytic oxidation/anodic aluminum oxide multi-layer film via one-step anodizing aluminum in ammonium carbonate
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Fabrication of a plasma electrolytic oxidation/anodic aluminum oxide multi-layer film via one-step anodizing aluminum in ammonium carbonate

机译：通过碳酸铵中铝的一步阳极氧化制备等离子电解氧化/阳极氧化铝多层膜

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摘要

A plasma electrolytic oxidation (PEO)/anodic aluminum oxide (AAO) multi-layer film was fabricated via onestep galvanostatic anodizing of high-purity aluminum in 0.3-2.0 M ammonium carbonate ((NH (4))(2)CO3) solutions at 283-333 K and 25-400 Am-2. Anodizing at higher concentrations and higher temperatures caused the formation of relatively uniform anodic oxide film on the aluminum substrate. Characteristic voltage-time curves with two high-plateau voltages at approximately 250 V and 375 V were obtained during galvanostatic anodizing. A mull-layer structure of an outer PEO layer with a crystalline gamma-Al2O3 structure and an inner amorphous AAO layer with nano-cylinerical pores was formed by continuous visible sparking occurring after passing the first voltage plateau region. The whole aluminum surface was covered with the multi-layer structure after reaching the second voltage region. The thickness of the mull-layer increased with time via the further anodizing process at the second plateau voltage. Pore sealing of the inner nanoporous film was achieved by immersion post-treatment in boiling water.
机译：通过在0.3-2.0 M的碳酸铵（（NH（4））（2）CO3）溶液中于高纯铝上进行一步恒电流阳极氧化，制得等离子电解氧化（PEO）/阳极氧化铝（AAO）多层膜。 283-333 K和25-400 Am-2。在较高的浓度和较高的温度下进行阳极氧化导致在铝基板上形成相对均匀的阳极氧化膜。在恒电流阳极氧化过程中，获得了两个高平稳电压（分别约为250 V和375 V）的特征性电压-时间曲线。在通过第一电压平稳区之后发生的连续可见电火花形成具有结晶γ-Al2 O 3结构的外部PEO层和具有纳米圆柱孔的内部无定形AAO层的薄层结构。到达第二电压区域后，整个铝表面被多层结构覆盖。在第二平稳电压下，通过进一步的阳极氧化工艺，海藻层的厚度随时间增加。通过在沸水中浸泡后处理实现内部纳米多孔膜的孔密封。

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