Mesurement of Passive Film Growth and Breakdown, and Excitation of Local Phenomena on Electrode By Using Electrochemical AFM・STM

使用电化学AFM·STM测量钝化膜的生长、破坏以及电极局部现象的激发

基本信息

批准号：
07650984
负责人：
AZUMI Kazuhisa
金额：
$ 1.41万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

In this research in-situ electrochemical AFM/STM technique was applied to passivated metal surface to obtain valuable information for analysis of electrode process such as passive film formation and growth, and breakdown. Micro-modification and excitation of local electrochemical process on electrodes were also aimed. (1) In-situ electrochemical AFM was applied to Ti film electrode sputtered onto quartz glass, Ti plate electrode, and Al electrode to observe growth and breakdown processes of the passive film under polarization condition. For Ti film proceeding of micro-crystallization due to very high electric field during film growth was found, resulting in surface roughening of the oxide surface, known as breakdown of the passive film. (2) Electrochemical tunneling spectroscopy technique was applied to the passive films formed on Fe and Ti to investigate their electronic properties. Tunneling barrier shape as a function of potential scanning in the electrochemical system, and effect of tip electrode on polarization condition through the space charge layr in the semiconductive electrode were evaluated. (3) Morphological change of corbon steel surface during active dissolution was observed by AFM.Results were compared with images obtained by SEM and conforcal laser microscopy. Corroding process was discussed concerning with the pearlite structure in the carbon steel. (4) AFM tip was used to achieve micro-modification of Al surface after anodic oxide film growth. After modification, however, tip was mechanically damaged resulting in degradation of AFM image observed. For such purpose development of more sophisticated technique for modification is required.

在这项研究中，原位电化学AFM/STM技术被应用于钝化金属表面，以获取有价值的信息，以分析电极过程，例如被动膜形成和生长以及崩溃。还针对电极上局部电化学过程的微型修饰和激发。（1）将原位电化学AFM应用于溅射到石英玻璃，Ti板电极和Al电极上的Ti膜电极上，以观察在极化条件下被动膜的生长和分解过程。对于由于非常高的电场，在膜生长过程中非常高的电场引起的Ti膜开始，导致氧化物表面的表面粗糙，称为被动膜的崩溃。（2）将电化学隧道光谱技术应用于在FE和Ti上形成的被动膜以研究其电子特性。评估了电化学系统中电势扫描的函数，并评估了尖端电极对通过半导体电极中太空电荷路线极化条件的影响。（3）通过AFM进行了活性溶解过程中氧钢表面的形态变化。将冲突与通过SEM和Conforcal激光显微镜获得的图像进行了比较。讨论了有关碳钢中珠光体结构的腐蚀过程。（4）使用AFM尖端在阳极氧化物膜生长后实现Al表面的微型修饰。然而，在修饰后，尖端被机械损坏，导致观察到的AFM图像降解。为了开发更复杂的技术进行修改。