Anodic Oxidation of Aluminum, Chromium, Hafnium, Niobium, Tantalum, Titanium, Vanadium, and Zirconium at Very Low Current Densities
Anodic Oxidation of Aluminum, Chromium, Hafnium, Niobium, Tantalum, Titanium, Vanadium, and Zirconium at Very Low Current Densities
复制标题
DOI：
10.1149/1.2428577
复制
发表时间：
1957-06
影响因子：
3.9
通讯作者：
H. Johansen;G. B. Adams;P. Rysselberghe
中科院分区：
文献类型：
--
作者：
H. Johansen;G. B. Adams;P. Rysselberghe
Some aspects of the mode of formation of anodic oxidation films in the potential region below oxygen evolution were examined for a number of metals under as nearly constant experimental conditions as possible. The metals selected were A1, Ti, Hf, V, Nb, Ta, and Cr. Results for Zr were reported in earlier publications. Electrolytic parameters and formation fields were evaluated from the unitary formation rates. Local currents were estimated using the method described previously.The mode of formation of anodic oxide films on metals is of increasing technical and scientific interest. The technical applications of anodization are well known, and further interest in the subject has derived lrom its importance from the point of view of the mechanism of electrode processes in general. The purpose of the present work was to examine the formation of anodic oxide films on certain metals below the potential of oxygen evolution under experimental conditions sufficiently constant to permit comparisons. The metals selected for study were A1, Ti, Hf, V, Nb, Ta, and Cr. Zr had been studied previously (1, 2). The pioneer work of Giintherschulze and of Giintherschulze and Betz initiated much of the present day interest in oxide film formation, many of the theoretical discussions having been based on their empirical results. The formation of anodic oxide films on Ta was reported by Gfintherschulze and Betz (3), and formation of films on the additional metals W, Zr, and A1 was discussed (4). Giintherschulze and Keller (5) reported that electrolytically formed oxides had high densities and high dielectric constants corresponding to the properties of fired oxides. Studies of the formation of these films led Giintherschulze and Betz (6) to the conclusion that the ion current forming the films followed an exponential relationship with the electric field. The work of Giintherschulze and Betz has been published in a book on electrolytic capacitors (7).
