Anodizing of Aluminum Covered with Hydroxide
Anodizing of Aluminum Covered with Hydroxide
复制标题
被氢氧化物覆盖的铝的阳极氧化
DOI：
10.4139/sfj.40.590
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
M. Nagayama
中科院分区：
文献类型：
--
作者：
Hideaki Takahashi;Y. Umehara;R. Furuichi;M. Nagayama
在40、60、80和95°C下在硼酸/硼酸盐溶液中在氢氧化物覆盖的铝上阳极形成复合氧化物膜，然后通过允许水渗透到氧化物膜中的空隙中来松弛。松弛后，用低电流对试样进行再阳极化，以测量阳极电位Eref的时间变化。通过分析Eref-tref曲线，确定了复合氧化膜中的空穴分布，发现水在一个诱导期后开始渗透，复合氧化膜弛豫的表观活化能为69.5KJ/mol。在复合氧化物膜的内层/外层界面和外层中心观察到高浓度的空隙。在除95°C以外的所有温度下，在阳极氧化期间，空隙的总体积随着阳极电位Ea而增加;在95°C下，空隙体积随着Ea而增加，直到Ea= 300 V，然后在Ea= 400 V时减小到一个小值。对于所有Ea值，空隙体积在60°C下显示出最大值。讨论了膜形成机制以解释如何建立空隙分布。
Composite oxide films were formed anodically on hydroxide-covered aluminum in a boric acid/borate solution at 40, 60, 80, and 95°C, and then relaxed by allowing water to penetrate into the voids in the oxide films. After relaxation, specimens were re-anodized with a low current to measure the time-variation in the anode potential, Eref. The void distribution in the composite oxide films was determined by analyzing the Eref vs. tref curve.It was found that the penetration of water started after an induction period, and that the apparent activation energy for the relaxation of composite oxide films was 69.5KJ/mol. Voids were observed in high concentrations at the inner layer/outer layer interphase, and at the center of the outer layer in the composite oxide film. The total volume of voids increased with anode potential, Ea, during anodizing at all temperatures except 95°C; at 95°C, the void volume increased with Ea up to Ea=300V, and then decreased to a small value at Ea=400V. The void volume showed a maximum at 60°C for all values of Ea.Film formation mechanisms are discussed to explain how void distribution is established.