Electrochemical test method based on potentiostat

Abstract

The invention relates to an electrochemical test method based on a potentiostat. The electrochemical test method comprises the following steps: preheating the potentiostat; the preheated constant potential rectifier is connected with an external electrolytic tank, parameter display of the constant potential rectifier is adjusted, and when the parameter display of the constant potential rectifier is normal, the next step is carried out; and connecting the constant potential rectifier with the three-electrode test device to measure the electrochemical data of the material of the three-electrode test device. According to the invention, the parameter display of the constant potential rectifier is adjusted, and when the parameter display of the constant potential rectifier is normal, the next experiment is carried out, so that the influence of external factors on the experiment result can be reduced, and the consistency and repeatability of the experiment are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of electrochemical testing, in particular to an electrochemical testing method based on a constant potential instrument. Background Art

[0002] With the development of social life, people pay more and more attention to the corrosion resistance of materials in their service environment. In the field of electrochemical research, electrochemical experimental methods are usually used to determine the electrochemical parameters of materials and evaluate the corrosion resistance of materials. The potentiostat can accurately control the electrode potential and record the current response, thereby providing important data for studying electrochemical reactions. Traditional electrochemical experiments have high requirements for the experimental environment. Factors such as temperature, humidity, and electrode surface contamination will have a significant impact on the test results. However, existing potentiostats are usually unable to monitor experimental variables, resulting in instability in experimental results. Summary of the invention

[0003] To solve the above problems, an embodiment of the present invention aims to provide an electrochemical test method based on a potentiostat.

[0004] An electrochemical test method based on a constant potential instrument, comprising:

[0005] Preheat the potentiostat;

[0006] Connect the preheated constant potential instrument to the external electrolytic cell, adjust the parameter display of the constant potential instrument, and when the parameter display of the constant potential instrument is normal, proceed to the next step;

[0007] Connect the potentiostat to the three-electrode test apparatus to measure the material electrochemical data of the three-electrode test apparatus.

[0008] Preferably, preheating the potentiostat comprises:

[0009] Disconnect the potentiostat from the load, adjust the current range to 1A, select the constant potential working mode, turn on the potentiostat, and preheat the potentiostat for at least thirty minutes.

[0010] Preferably, the preheated constant potential instrument is connected to the external electrolytic cell, the parameter display of the constant potential instrument is adjusted, and when the parameter display of the constant potential instrument is normal, the next step is performed, including:

[0011] Connect the preheated constant potential instrument to the external electrolytic cell, select the load state of the constant potential instrument as the electrolytic cell state, disconnect the solution resistance compensation switch on the constant potential instrument, and adjust the input voltage of the constant potential instrument to 0V. When the voltage and current readings on the display screen of the constant potential instrument are within the preset range, the parameters of the constant potential instrument are displayed normally. Otherwise, check the constant potential instrument and repeat this step.

[0012] Turn on the working button on the potentiostat, select the current range to 1mA, and adjust the input voltage to +1.000V. When the current reading on the potentiostat display is within the preset range, the parameters of the potentiostat are normal. Otherwise, check the potentiostat and repeat this step.

[0013] Adjust the input voltage of the potentiostat to -1.000V. When the current reading on the potentiostat display is within the preset range, the parameters of the potentiostat are normal. Otherwise, check the potentiostat and repeat this step.

[0014] Preferably, the three-electrode test device comprises an auxiliary electrode, a working electrode and a reference electrode.

[0015] Preferably, the potentiostat is connected to the three-electrode test device to measure the material electrochemical data of the three-electrode test device, including:

[0016] Connect the working electrode cable and the auxiliary electrode cable on the potentiostat connected to the electrolytic cell to the working electrode and the auxiliary electrode on the three-electrode test device respectively, and connect the reference probe on the potentiostat to the reference electrode on the three-electrode test device;

[0017] Turn on the working key on the potentiostat, select the reference measurement working mode, and set the load state on the potentiostat to the electrolytic cell state. At this time, the voltage reading on the potentiostat is the open circuit potential of the reference electrode on the three-electrode test device relative to the working electrode, and the sign is opposite.

[0018] The load state of the potentiostat is selected as the electrolytic cell state, the input voltage and current range set for the electrochemical test are selected, and the polarization current parameters of the three-electrode test device are measured to obtain the test curve.

[0019] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0020] The present invention relates to an electrochemical test method based on a constant potential instrument. Compared with the prior art, the present invention reduces the influence of external factors on the experimental results and ensures the consistency and repeatability of the experiment by adjusting the parameter display of the constant potential instrument and performing the next experiment when the parameter display of the constant potential instrument is normal.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 The present invention provides a flow chart of an electrochemical test method based on a constant potential instrument. DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] See also Figure 1 , an electrochemical test method based on a potentiostat, comprising:

[0028] Step 1: Preheat the potentiostat;

[0029] The process of preheating the potentiostat includes:

[0030] Disconnect the potentiostat from the load, adjust the current range to 1A, select the constant potential working mode, turn on the potentiostat, and preheat the potentiostat for at least thirty minutes.

[0031] Step 2: Connect the preheated constant potential instrument to the external electrolytic cell, adjust the parameter display of the constant potential instrument, and when the parameter display of the constant potential instrument is normal, proceed to the next step;

[0032] Furthermore, step 2 includes:

[0033] Connect the preheated constant potential instrument to the external electrolytic cell, select the load state of the constant potential instrument as the electrolytic cell state, disconnect the solution resistance compensation switch on the constant potential instrument, and adjust the input voltage of the constant potential instrument to 0V. When the voltage and current readings on the display screen of the constant potential instrument are within the preset range, the parameters of the constant potential instrument are displayed normally. Otherwise, check the constant potential instrument and repeat this step.

[0034] Turn on the working button on the potentiostat, select the current range to 1mA, and adjust the input voltage to +1.000V. When the current reading on the potentiostat display is within the preset range, the parameters of the potentiostat are normal. Otherwise, check the potentiostat and repeat this step.

[0035] Adjust the input voltage of the potentiostat to -1.000V. When the current reading on the potentiostat display is within the preset range, the parameters of the potentiostat are normal. Otherwise, check the potentiostat and repeat this step.

[0036] Step 3: Connect the potentiostat to the three-electrode test apparatus to measure the material electrochemical data of the three-electrode test apparatus.

[0037] Furthermore, step 3 includes:

[0038] The working electrode cable and the auxiliary electrode cable connected to the electrolytic cell on the potentiostat are connected to the working electrode and the auxiliary electrode on the three-electrode test device respectively, and the reference probe on the potentiostat is connected to the reference electrode on the three-electrode test device; the three-electrode test device includes an auxiliary electrode (CE), a working electrode (WE), and a reference electrode (RE). The auxiliary electrode (CE) is placed opposite to the working electrode (WE), and the reference electrode (RE) is as close as possible to the working electrode (WE) but does not touch it.

[0039] Turn on the working key on the potentiostat, select the reference measurement working mode, and set the load state on the potentiostat to the electrolytic cell state. At this time, the voltage reading on the potentiostat is the open circuit potential of the reference electrode on the three-electrode test device relative to the working electrode, and the sign is opposite.

[0040] The load state of the potentiostat is selected as the electrolytic cell state, the input voltage and current range set for the electrochemical test are selected, and the polarization current parameters of the three-electrode test device are measured to obtain the test curve.

[0041] The present invention further describes the electrochemical test method of the present invention in conjunction with specific embodiments below:

[0042] Step 1: Preparation of the potentiostat before the experiment.

[0043] First, disconnect the working key on the instrument and disconnect the constant potential instrument from the load. Adjust the current range to 1A and select the constant potential working mode. Check whether the 220V AC power supply is normal, turn on the power, and preheat the constant potential instrument for at least thirty minutes.

[0044] Step 2: Adjust the parameter display of the potentiostat.

[0045] After the first step is completed, select the load state as the electrolytic cell state. At this time, the constant potential instrument is connected to the external electrolytic cell. Disconnect the solution resistance compensation switch, adjust the internal input voltage to 0V, and the voltage and current readings on the display screen are ±0.000X (only the last digit is displayed). Turn on the work key on the instrument and reselect the current range to 1mA. Adjust the input voltage to +1.000V, and the current reading should be around -1.000. Adjust the input voltage to -1.000V, and the current reading should be around 1.000.

[0046] Step 3: Connect the three-electrode system device.

[0047] The three-electrode test device includes an auxiliary electrode (CE), a working electrode (WE), and a reference electrode (RE). The electrolytic cell cable of the potentiostat leads to a low-potential working electrode cable and a high-potential auxiliary electrode cable, and the two probes on it are connected to the two electrodes of the three-electrode test device respectively, and the reference probe of the potentiostat is connected to the reference electrode of the three-electrode test device.

[0048] Step 4: Measure the open circuit potential.

[0049] Turn on the work button on the instrument, select the reference measurement working mode, and select the load state as the electrolytic cell state. At this time, the voltage reading is the open circuit potential of the reference electrode (RE) relative to the working electrode (WE), with the opposite sign.

[0050] Step 5: Measure the polarization current.

[0051] The signal selection is changed from the initial internal setting to the internal and external setting, that is, the DC voltage signal provided by the instrument is changed to a synthetic signal composed of the internal and external. The load state is selected as the electrolytic cell state, the input voltage of the test design is selected, and the appropriate current range is selected to obtain the polarization current parameters and test curves.

[0052] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0053] The present invention adjusts the parameter display of the constant potential instrument, and when the parameter display of the constant potential instrument is normal, the next step of the experiment is carried out, which can reduce the influence of external factors on the experimental results and ensure the consistency and repeatability of the experiment. In addition, the constant potential instrument provides a constant voltage, and the probe of its input three-electrode system has a very high impedance and will not be affected by the reaction current of the working electrode. The test results have good stability and reliability, and provide real and effective electrochemical data.

[0054] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solution that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An electrochemical test method based on a potentiostat, characterized in that: include: Preheat the potentiostat; Connect the preheated constant potential instrument to the external electrolytic cell, adjust the parameter display of the constant potential instrument, and when the parameter display of the constant potential instrument is normal, proceed to the next step; Connect the potentiostat to the three-electrode test apparatus to measure the material electrochemical data of the three-electrode test apparatus.

2. The electrochemical test method based on a potentiostat according to claim 1, characterized in that: Preheat the potentiostat, including: Disconnect the potentiostat from the load, adjust the current range to 1A, select the constant potential working mode, turn on the potentiostat, and preheat the potentiostat for at least thirty minutes.

3. The electrochemical test method based on a potentiostat according to claim 1, characterized in that: The preheated constant potential instrument is connected to the external electrolytic cell, and the parameter display of the constant potential instrument is adjusted. When the parameter display of the constant potential instrument is normal, the next step is performed, including: Connect the preheated constant potential instrument to the external electrolytic cell, select the load state of the constant potential instrument as the electrolytic cell state, disconnect the solution resistance compensation switch on the constant potential instrument, and adjust the input voltage of the constant potential instrument to 0V. When the voltage and current readings on the display screen of the constant potential instrument are within the preset range, the parameters of the constant potential instrument are displayed normally. Otherwise, check the constant potential instrument and repeat this step. Turn on the working button on the potentiostat, select the current range to 1mA, and adjust the input voltage to +1.000V. When the current reading on the potentiostat display is within the preset range, the parameters of the potentiostat are normal. Otherwise, check the potentiostat and repeat this step. Adjust the input voltage of the potentiostat to -1.000V. When the current reading on the potentiostat display is within the preset range, the parameters of the potentiostat are normal. Otherwise, check the potentiostat and repeat this step.

4. The electrochemical test method based on a potentiostat according to claim 1, characterized in that: The three-electrode test device comprises an auxiliary electrode, a working electrode and a reference electrode.

5. The electrochemical test method based on a potentiostat according to claim 4, characterized in that: Connect the potentiostat to the three-electrode test apparatus to measure the material electrochemical data of the three-electrode test apparatus, including: Connect the working electrode cable and the auxiliary electrode cable on the potentiostat connected to the electrolytic cell to the working electrode and the auxiliary electrode on the three-electrode test device respectively, and connect the reference probe on the potentiostat to the reference electrode on the three-electrode test device; Turn on the working key on the potentiostat, select the reference measurement working mode, and set the load state on the potentiostat to the electrolytic cell state. At this time, the voltage reading on the potentiostat is the open circuit potential of the reference electrode on the three-electrode test device relative to the working electrode, and the sign is opposite. The load state of the potentiostat is selected as the electrolytic cell state, the input voltage and current range set for the electrochemical test are selected, and the polarization current parameters of the three-electrode test device are measured to obtain the test curve.

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