Anodizing of Aluminum Coated with Zirconium Oxide by a Sol-Gel Coating.
Anodizing of Aluminum Coated with Zirconium Oxide by a Sol-Gel Coating.
复制标题
通过溶胶-凝胶涂层对涂有氧化锆的铝进行阳极氧化。
DOI：
10.4139/sfj.50.359
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
S. Yamaguchi
中科院分区：
文献类型：
--
作者：
Keiji Watanabe;M. Sakairi;Hideaki Takahashi;S. Hirai;S. Yamaguchi
用溶胶-凝胶涂层覆盖氧化锆膜，在中性硼酸盐溶液中进行恒电流阳极氧化。对阳极氧化过程中阳极电位的时间变化进行了监测，并通过TEM、EDX、RBS和阻抗测量研究了阳极氧化膜的结构和介电性能。我们发现阳极电位随时间的增加而增加，电位-时间曲线的斜率随溶胶-凝胶涂层数量的增加而增加。在阳极氧化过程中，在zr -氧化物与基体的界面处形成一层由内Al2O3层和外Al-Zr复合氧化层组成的阳极氧化膜。内层厚度随阳极氧化时间的延长而增加，外层厚度随阳极氧化时间的延长而减小。经溶胶-凝胶涂层和阳极氧化处理后的试样的电容量比未经过溶胶-凝胶涂层的试样高20%。阳极氧化膜的介电性能与膜的结构有关。从zr -氧化层孔隙率分布和氧化过程中Zr4+离子在复合氧化层上的向外迁移等方面讨论了zr -氧化膜在复合氧化层上生长的机理。
Aluminum specimens were covered with zirconium oxide film by a sol-gel coating and galvanostatically anodized in a neutral borate solution.The time variation in anode potential during anodizing was monitored,and the structure and dielectric properties of the anodic oxide film were studied by TEM,EDX,RBS,and impedance measurement. We found that the anode potential increases with time,and that the slope of the potential-time curve increases with increasing the numbers of sol-gel dip coatings.During anodizing,an anodic oxide film,which consisted of an inner Al2O3 layer and an outer Al-Zr composite oxide layer,formed at the interface between Zr-oxide and the substrate.The thickness of the inner layer increased with anodizing time,and the thickness of the outer layer peaked before decreasing with time.The capacitance of the specimen after sol-gel coating and anodizing was 20% higher than that without sol-gel coating.The dielectric property of anodic oxide films was correlated with film structure. The mechanism of anodic oxide films growth on the spceimen covered with Zr-oxide is discussed in terms of the porosity distribution in the Zr-oxide layer and the outward transport of Zr4+ ions across the composite oxide layer during anodizing.