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首页> 外文期刊>ISIJ international >Development of Scanning Laser-Enhanced Electrochemical Microscopy for Visualizing Hydrogen Distribution on a Steel
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Development of Scanning Laser-Enhanced Electrochemical Microscopy for Visualizing Hydrogen Distribution on a Steel

机译：用于可视化钢中氢分布的扫描激光增强电化学显微镜的开发

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A Scanning Laser-Enhanced Electrochemical Microscope for Hydrogen detection (H-SLEEM) has been developed in order to in-situ visualize the distribution of hydrogen localized on a steel surface. Introduction and detection of hydrogen for the steel sheet was conducted by hydrogen permeation technique with a pair of electrochemical cells. When the hydrogen detection side under hydrogen permeation is irradiated with focused Ar laser, anodic current relating to hydrogen oxidation reaction is thermally enhanced at the irradiation spot and then anodic current increment corresponding to the hydrogen permeation rate at the spot is expected to be determined. In the case that whole the hydrogen detection side was irradiated with diffused laser, the anodic current increased and the current increment increased with an increase in the hydrogen permeation current. The use of focused laser also permitted the measurement of the anodic current increment depending on the hydrogen permeation current. The modulated laser provided more stable and reproducible current increment. When the specimen whose hydrogen entry side was masked except for a small exposed area in center was employed and the modulated laser was raster-scanned under hydrogen permeation, a very clear image of the two-dimensional distribution in the current increment corresponding to local hydrogen permeation rate on the detection side was obtained. It is concluded that the H-SLEEM can successfully visualize the localized hydrogen distribution on the steel surface.
机译：已经开发出用于氢气检测的扫描激光增强电化学显微镜（H-SLEEM），以便就地观察钢表面上的氢气分布。通过氢渗透技术和一对电化学电池对钢板中的氢进行引入和检测。当通过聚焦的Ar激光照射氢渗透下的氢检测侧时，与氢氧化反应有关的阳极电流在照射点处被热增强，然后期望确定对应于该点处氢渗透率的阳极电流增量。在整个氢检测侧被扩散激光照射的情况下，阳极电流增加，并且电流增加随着氢渗透电流的增加而增加。聚焦激光的使用还允许根据氢渗透电流来测量阳极电流增量。调制激光器提供了更稳定和可再现的电流增量。当使用除氢进入侧被遮盖的试样（除了中心的小暴露区域之外）并在氢渗透下对调制激光进行光栅扫描时，电流分布中二维分布的非常清晰的图像对应于局部氢渗透获得检测侧的比率。结论是，H-SLEEM可以成功地可视化钢表面上的局部氢分布。

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