RAMAN-SPECTRA OF THE ANODIC OXIDE FILM ON TITANIUM IN ACIDIC SULFATE AND NEUTRAL PHOSPHATE SOLUTIONS
RAMAN-SPECTRA OF THE ANODIC OXIDE FILM ON TITANIUM IN ACIDIC SULFATE AND NEUTRAL PHOSPHATE SOLUTIONS
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DOI：
10.1149/1.2108452
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发表时间：
1986-12-01
影响因子：
3.9
通讯作者：
SATO, N
中科院分区：
文献类型：
--
作者：
OHTSUKA, T;GUO, JJ;SATO, N
在中性磷酸盐和酸性硫酸盐溶液中，用激光拉曼光谱在原位和非原位条件下对钛表面不同电位下形成的阳极氧化膜进行了研究。拉曼光谱表明，阳极氧化膜主要由锐钛矿型的二氧化钛组成。从拉曼光谱强度、膜厚和表面形貌之间的关系来看，在一定的临界电位范围内，膜很可能从非晶态转变为晶态。在我们以前的工作(1)中，我们研究了钛阳极氧化膜在硫酸、盐酸和磷酸钠溶液中的膜厚-点势关系、极化曲线和表面形貌。在工作中发现，在7.5V的临界电势下，薄膜发生了一种击穿，在比击穿电位E_i更负的电位区，薄膜在厚度-电位比约为2.5nmV~(-1)时与电势呈线性增长，而在比EB更正的电势区，薄膜的厚度以较高的比率增加，导致表面粗糙。
Laser Raman spectroscopy has been applied under in situ and ex situ conditions to the anodic oxide films formed on titanium at various potentials in neutral phosphate and acidic sulfate solutions. The Raman spectra revea] that the anodic oxide film is primarily composed of an anatase type of TiO~. From the relation between the Raman band intensity, film thickness, and surface morphology, it is likely that the film changes from the amorphous state to the crystalline state beyond a certain critical potential.In our previous work (1) the anodic oxide film on titanium was examined with respect to the film thicknesspotential relation, polarization curve, and surface morphology in solutions of sulfuric acid, hydrochloric acid, and sodium phosphate. In the work, it was found that a kind of breakdown of the film occurred at a critical potential of 7.5 V. In the potential region more negative than the breakdown potential, E,,, the film grew linearly with potential at a thickness-potential ratio of about 2.5 nmV-', while, in the potential region more positive than Eb, the film thickness increased at a higher ratio, giving rise to surface roughening.