Optical Changes in Oxide Films on Iron prior to Breakdown
Optical Changes in Oxide Films on Iron prior to Breakdown
复制标题
击穿前铁上氧化膜的光学变化
DOI：
10.1038/physci230194a0
复制
发表时间：
1971
期刊：
影响因子：
64.8
通讯作者：
J. Kruger
中科院分区：
文献类型：
--
作者：
C. Mcbee;J. Kruger
最近的一项研究1使用椭圆光度法的光学技术2来研究氯离子对铁上钝化氧化膜的局部破坏，揭示了诱导期的存在。在击穿前的诱导期内，使用 5461.0 Å 的波长未发现薄膜特性发生变化。这些结果表明，导致崩溃的过程仅发生在崩溃时刻。这可能意味着氯化物对钝化膜没有影响，直到表面立即引发击穿的过程完成为止。这方面的一个例子是 Hoar3 提出的氯离子金属离子复合物的形成，用于分解不锈钢上的钝化膜。或者，相反，这表明虽然薄膜在击穿之前发生了微妙的变化（例如，氯离子缓慢渗透薄膜的晶格），但当使用 5461.0 Å 的单一波长时，椭圆光度法无法检测到这些变化。
A RECENT investigation1using the optical technique of ellip-sometry2to study the localized breakdown of a passive oxide film on iron by chloride ions revealed the existence of an induction period. During this induction period prior to breakdown, no changes in the film's properties were found using a wavelength of 5461.0 Å. Those results indicate that the processes leading to breakdown occur only at the moment of breakdown. This could mean that chloride has no effect on the passive film until the completion of a process at the surface which instantaneously initiates breakdown. An example of this would be the formation of the chloride-metal ion complex suggested by Hoar3for the breakdown of a passive film on stainless steel. Or, conversely, it would indicate that although subtle changes are taking place in the film prior to breakdown (the slow penetration of the chloride ion through the film's lattice, for example), these changes are not detected with ellipsometry when using the single wavelength of 5461.0 Å.