Anodizing of Aluminum Coated with SiO2 by Sol-Gel Coating. Formation of New Type Anodic Oxide Film with High Voltage Sustainability.
Anodizing of Aluminum Coated with SiO2 by Sol-Gel Coating. Formation of New Type Anodic Oxide Film with High Voltage Sustainability.
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溶胶-凝胶涂层法对涂覆 SiO2 的铝进行阳极氧化。
DOI：
10.4139/sfj.54.235
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
S. Hirai
中科院分区：
文献类型：
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作者：
Keiji Watanabe;M. Sakairi;Hideaki Takahashi;S. Hirai
采用溶胶-凝胶法在铝表面涂覆SiO2薄膜，然后在硼酸溶液中进行恒电流阳极氧化。在阳极氧化过程中的阳极电位的时间变化进行了监测，和阳极氧化膜的结构和介电性能的TEM-EDX，和电化学阻抗测量进行了研究。研究发现，阳极氧化涂有SiO2膜的铝会在SiO2膜和金属基底之间的界面处形成阳极氧化膜，该膜由外部Al-Si复合氧化物层和内部Al 2 O3层组成。氧化膜的击穿电位比无SiO2涂层的高100 V左右。溶胶-凝胶涂层和阳极氧化后的样品的电容略高于未溶胶-凝胶涂层。在成膜机理中，讨论了含Si阴离子穿过外层向内迁移的Al_2O_3在内外层界面处转化为Al-Si复合氧化物。
Aluminum specimens were covered with SiO2 film by a sol-gel coating and then anodized galvanostatically in a boric acid solution. Time variations in the anode potential during anodizing were monitored, and the structure and dielectric properties of anodic oxide films were examined by TEM-EDX, and electrochemical impedance measurements. It was found that anodizing of aluminum coated with SiO2 films leads to the formation of anodic oxide films that consist of an outer Al-Si composite oxide layer and an inner Al2O3 layer at the interface between the SiO2 film and the metal substrate. The breakdown potential of anodic oxide films formed on specimens with SiO2-coating was about 100 V higher than that without SiO2 coating. The capacitance of specimens after sol-gel coating and anodizing was slightly higher than that without sol-gel coating. In the film formation mechanism, the conversion of Al2O3 into Al-Si composite oxide at the interface between the inner and outer layers is discussed in terms of inward transport of Si-bearing anions across the outer layer.