Multi-channel galvanic corrosion test system and method based on micro electrode array

Abstract

The invention belongs to the field of measurement and automation, and in particular relates to a method and system for testing multi-channel galvanic corrosion. By a test method for performing high speed switching of current measurement and potential measurement of each micro electrode in the micro electrode array and measurement of all micro electrodes to be measured, galvanic corrosion current and galvanic corrosion potential data of each micro electrode are extremely high in synchronism; the synchronism of the galvanic corrosion current and the galvanic corrosion potential data of different micro electrodes is also greatly improved; and information of a galvanic corrosion process and a dynamic change of the information can be accurately obtained. A hardware test system consists of a modular instrument adopting a PXI bus technology, is easy to construct, can be flexibly reconfigured and has high integration degree and reliability. According to a software system compiled by a graphical development environment LabVIEW, functions of the hardware system can be configured according to requirements; and a test logic of a background and a human-machine interaction interface of a foreground can be customized.

Description

technical field [0001] The invention relates to the field of measurement and automation, in particular to a multi-channel galvanic corrosion test method and a test system for local corrosion research. Background technique [0002] Microelectrode array, also known as wire beam electrode, is an electrochemical sensor composed of multiple tiny metal or alloy electrode wires (microelectrodes) arranged in a certain way. Each microelectrode can be coupled with each other and used as a whole large-area metal electrode to obtain the average electrochemical information related to corrosion on the electrode / solution interface, and can also be used as an independent micro-probe to test the electrochemical properties of each micro-area. parameter to obtain information about the electrochemical distribution at the electrode / solution interface. Since the microelectrode array technology is not as sensitive to the surface of the electrode as other micro-area electrochemical testing techniq...

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Problems solved by technology

[0004] However, the relatively lagging development of testing technology and testing equipment has become a bottleneck for the wide application of micro-electrode array technology. It is reported in literature that an array electrode testing device has been established, but the key part of the equipment - the automatic switch is custom-made. It cannot be popularized commercially; there are also literatures claiming that the wire beam electrode test system cannot be tested automatically, so it is very inconvenient to use

Recently, it has been reported that a set of array electrode electrochemical distribution tester was built with the modular instrument of American NI Company, and the measurement and control program was written with LabVIEW 8.5 software, which made great progress in the research of corrosion inhomogeneity of materials; However, due to the limitations of the hardware configuration and the wiring of the digital multimeter, the potential scan and current scan of the array electrodes need to be tested separately, and the test takes a long time, resulting in low synchronization between the measured potential data and current data. The analysis and research of galvanic corrosion data brings certain difficulties, and the degree of automation of the test process needs to be improved

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