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Spontaneous Current Oscillations during Hard Anodization of Aluminum under Potentiostatic Conditions

机译:恒电位条件下铝硬质阳极氧化过程中的自发振荡

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摘要

Nanoporous anodic aluminum oxide is prepared by hard anodization of aluminum under potentiostatic conditions using 0.3 m H_2C_2O_4. Under unstirred electrolyte condition, spontaneous current oscillations are observed. The amplitude and period of these current oscillations are observed to increase with anodization time. As a consequence of the oscillatory behavior, the resulting anodic alumina exhibits modulated pore structures, in which the diameter contrast and the length of pore modulation increase with the amplitude and the period of current oscillations, respectively, and the current peak profile determines the internal geometry of oxide nanopores. The mechanism responsible for the oscillatory behavior is suggested to be a diffusion-controlled anodic oxidation of aluminum.
机译:通过在恒电位条件下使用0.3 m H_2C_2O_4对铝进行硬阳极氧化来制备纳米多孔阳极氧化铝。在未搅拌的电解质条件下,观察到自发电流振荡。观察到这些电流振荡的幅度和周期随阳极氧化时间而增加。作为振荡行为的结果,所得的阳极氧化铝具有调节的孔结构,其中直径对比度和孔调节长度分别随电流振荡的幅度和周期而增加,并且电流峰值轮廓决定了内部几何形状氧化物纳米孔。建议引起振荡行为的机理是铝的扩散控制阳极氧化。

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  • 来源
    《Advanced Functional Materials》 |2010年第1期|21-27|共7页
  • 作者单位

    Korea Research Institute of Standards and Science Yuseong, 305-340 Daejon (Korea);

    Korea Research Institute of Standards and Science Yuseong, 305-340 Daejon (Korea);

    Max Planck Institute of Microstructure Physics Weinberg 2, 06210 Halle (Germany);

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