Microelectrode technology for metal surface microcell current distribution in-situ detection
A metal surface and microelectrode technology, applied in scanning probe technology, scanning probe microscopy, measuring devices, etc.
Active Publication Date: 2013-12-11
XIAMEN LE GANG MATERIALS TECH
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However, in today's world, there are few reports on the preparation technology of microprobes for in-situ detection of the current distribution in the micro-area of the metal surface, and the composite microprobes that can be used in the STM-assisted SMET measurement system have not been reported. The development of accurate measurement of the metal surface Composite scanning microprobes for micro-area current distribution is an urgent problem to be solved at present
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[0023] The STM-assisted scanning microelectrode measurement system consists of 4 units: scanning tunneling microscope (STM) measurement platform; scanning microprobe and control / drive unit; tunnel current signal and micro-potential signal measurement unit and control and processing of measurement signals unit. The STM measurement platform is an open commercial STM instrument, see figure 2 , scanning microprobes and control / drive units include scanning microprobes [9], X-Y-Z three-dimensional piezoelectric micro-scanners [10] and stepping motor-driven X-Y two-dimensional mechanical scanners [11]. The tunnel current signal and micro-zone potential signal measurement unit includes the tunnel current pre-signal conversion / amplification and feedback circuit [12] and the micro-zone potential signal pre-signal conversion / amplification circuit [13].
[0024] The experimental samples are selected from R235 carbon steel and 18 / 8 stainless steel. The sample was polished to 2000# from ...
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The invention discloses a microelectrode technology for metal surface microcell current distribution in-situ detection. The microelectrode technology for metal surface microcell current distribution in-situ detection is used for detecting two-dimensional current distribution of the surface of a metal sample through a scanning tunneling microscope and a current scanning microelectrode coupling technology. Tunnel current signals between the sample and a probe and a distribution image of corrosion parameters of surface microcell currents and the like can be simultaneously detected by a microelectrode. Due to the fact that the probe has the capacity of detecting the tunnel current signals, the distance between the scanning probe and the sample can be accurately controlled within the micron range and the spatial resolution and the reproducibility of a test are greatly improved; microcell current density distribution is important information for metal local corrosion research, more accurate research data relative to local corrosion can be offered through the measurement of the current density distribution, and therefore the change of the local corrosion rate of the surface microcell position can be observed in a continuous tracing mode in the site.
Description
Technical field: [0001] The invention relates to a microelectrode preparation technology for in-situ detection of two-dimensional corrosion current distribution on a metal surface by a scanning microelectrode measurement (SMET) system assisted by a scanning tunneling microscope (STM). Background technique: [0002] The current density distribution of the micro-area on the metal surface is closely related to the local corrosion process of the metal. The measurement of the current density distribution can provide fine information about the local corrosion process with spatial resolution and time resolution. How to realize the in-situ continuous high-resolution measurement of the local corrosion current distribution Testing has become a hot spot in the current related research, and various scanning microelectrode technologies are the main technical means to achieve the above goals. [0003] STM-assisted scanning microelectrode measurement system (SMET / STM combined technology) i...
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IPC IPC(8): G01Q70/08
Inventor 林昌健林理文温力雄
Owner XIAMEN LE GANG MATERIALS TECH