Simple and fast electrochemical test device

Abstract

The invention relates to an electrochemical test device, and specifically discloses a device for an electrochemical test of a typical three-electrode system. The device comprises a counter electrode, a reference electrode and a working electrode. The working electrode is fixed at a four-bladed clamp, a nut on the external wall of the four-bladed clamp is screwed to ensure that a test piece is clamped, and a tail plastic cover is screwed up to ensure that the test piece is fully connected for electric conduction. The device provided by the invention can quickly and conveniently perform the electrochemical test, and avoids the defects of temperature influence of welding, long sample sealing time, difficulty in accurate control of working area, and so on.

Description

Technical field [0001] The invention relates to a device for electrochemical testing, in particular to a device for electrochemical testing of a typical three-electrode system. Background technique [0002] The electrochemical test method is to convert the change of chemical substances into an electrochemical reaction, that is, to measure the potential, current capacitance, electricity, etc. in the system as the measurement of the chemical reaction in the system. Including polarization curve test, AC impedance test, cyclic voltammetry test, electrochemical noise test, etc. A large amount of information obtained from electrochemical tests can be used to study the properties of materials such as corrosion resistance, electrochemical reaction mechanism, electrode reaction reversibility, active material adsorption and desorption, and surface passivation behavior. Therefore, electrochemical testing has important applications in the fields of corrosion and protection, chemical po...

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Problems solved by technology

[0003] However, the traditional three-electrode electrochemical test system has many disadvantages: each working electrode needs to be welded separately, so that not only the consumables but also the high temperature during welding will have a large impact on the sample (especially the surface with a film structure). After welding the wires, it is necessary to seal the sample with epoxy resin or silica gel, and only expose a fixed area. This not only requires a long time to wait for curing and drying, but also easily produces air bubbles or micropores, and the working area is not easy to control accurately. This will greatly affect the measurement results

In addition, in many cases, the morphology of the tested samples needs to be observed under a scanning electron microscope. The samples sealed with epoxy resin or silica gel occupy a large space in the vacuum chamber and have poor conductivity, which reduces the space utilization and increases processing difficulty

There have been slightly improved devices before (Zhou Xianliang, Guo Wenyan, Ye Zhiguo, etc., a three-electrode system electrochemical test device. 201020257142.3), but this device has not yet solved the disadvantages of welding wires, and this device needs to ensure a larger The sample area and more test solution, which is undoubtedly a waste

Since the sample is fixed on one side of the container instead of the center, this device is not advisable when it is necessary to study the effect of material diffusion on the electrode

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