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首页> 外文期刊>International Journal of Electrochemical Science >Anodization of aluminum in highly viscous phosphoric acid PART 1: Investigation of anodic oxide layers by scanning electron microscopy (SEM) and in-situ electrochemical impedance spectroscopy (in-situ EIS)
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Anodization of aluminum in highly viscous phosphoric acid PART 1: Investigation of anodic oxide layers by scanning electron microscopy (SEM) and in-situ electrochemical impedance spectroscopy (in-situ EIS)

机译：高粘度磷酸中铝的阳极氧化第1部分：通过扫描电子显微镜（SEM）和原位电化学阻抗谱（原位EIS）研究阳极氧化层

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A newly developed self-sticking tape which can be removed without residue facilitates localanodization on aluminum in cases of repair or re-work. The most prominent difference compared toconventional bath anodization is the exceptionally high viscosity of the electrolyte employed in theanodization tape. The impact of the highly viscous electrolyte on anodization is not yet known and wastherefore investigated by SEM and in-situ electrochemical impedance spectroscopy (in-situ EIS). Byemploying cryo-SEM it could be shown that at the late stages of tape anodization (25 min at 25 V)products of the anodization process accumulate near the anodized surface and partly block it.According to XPS analysis, the blocking layer mainly consists of organic material originating from thetape adhesive, while the concentration of aluminium ions is relatively low. The high frequency part ofthe in-situ EIS was evaluated with respect to the electrical properties which commonly characterize thebarrier layer of the anodic oxide, namely its resistance and capacitance. At the beginning, the valuesfor tape anodization are in good agreement with the data for a conventional bath anodization process.However, large deviations were found for longer anodization times. These deviations could also beattributed to a partial blocking of the anodic oxide. Using a model originally proposed by Jüttner andLorenz [12], the degree of coverage could be precisely determined from the in-situ EIS data. A goodagreement with the coverage data from cryo-SEM was found.
机译：新开发的自粘胶带可以去除而不会残留，有助于在维修或返工时对铝进行局部阳极氧化处理。与常规浴阳极氧化相比，最突出的区别是阳极氧化带中使用的电解液具有极高的粘度。尚不知道高粘度电解质对阳极氧化的影响，因此需要通过SEM和原位电化学阻抗谱（原位EIS）进行研究。通过cryo-SEM可以发现，在胶带阳极氧化的后期（25 V下25分钟），阳极氧化过程中的产物会积聚在阳极氧化的表面附近并部分被阻挡。根据XPS分析，阻挡层主要由有机层组成这种材料源自tape胶粘剂，而铝离子的浓度相对较低。就通常表征阳极氧化物的阻挡层的电性能，即其电阻和电容，评估了原位EIS的高频部分。刚开始时，胶带阳极氧化的值与常规浴阳极氧化工艺的数据非常吻合，但是，发现较长的阳极氧化时间会有较大的偏差。这些偏差也可能归因于阳极氧化物的部分阻塞。使用最初由Jüttner和Lorenz提出的模型[12]，可以从现场EIS数据精确确定覆盖程度。发现与cryo-SEM的覆盖率数据具有良好的一致性。

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