Detection method of electrode foil dust

Abstract

The present application discloses a method for detecting electrode foil ash, including pre-treatment: taking two pieces of electrode foil of the same area and performing ultrasonic cleaning to obtain a first solution and a second solution after cleaning; foil ash digestion: adding a certain amount of hydrochloric acid to the first solution and letting it stand at room temperature, adding a certain amount of hydrochloric acid and nitric acid to the second solution and letting it stand at high temperature; foil ash detection: the aluminum content of the solution in the first container is wt1, and the aluminum content of the solution in the second container is wt2; determining the content of metallic aluminum and aluminum oxide in the foil ash. According to the technical solution provided in the embodiment of the present application, by performing qualitative and quantitative analysis on the foil ash on the surface of the electrode foil, the composition of the foil ash is judged based on the difference in the digestion conditions of aluminum and aluminum oxide according to the composition of the foil ash, and the method is simple to operate and has high accuracy, realizing scientific control of the electrode foil material, thereby reducing the probability of breakdown or short circuit of the aluminum electrolytic capacitor, and ultimately achieving the goal of improving the capacitor yield.

Description

Technical Field

[0001] The present invention generally relates to the field of aluminum electrolytic capacitors, and in particular to a method for detecting electrode foil dust. Background Art

[0002] Electrode foil is a core component of aluminum electrolytic capacitors and a crucial factor in determining their stability. Electrode foil consists of aluminum foil coated with an alumina dielectric layer. Electrode foil cutting is a crucial process in capacitor production. After being cut to a certain width, the electrode foil can be wound into a capacitor core. During the electrode foil cutting process, the oxide film and the remaining aluminum core deform under stress, producing debris called foil ash. The main components of the foil ash are aluminum oxide, aluminum, or a combination of aluminum oxide and aluminum. If the foil ash is aluminum, it can cause the electrode foil to break down in the capacitor, leading to capacitor failure. If the foil ash is aluminum oxide, the contact resistance of the electrode foil where it falls may change, causing capacitor performance to deteriorate. Therefore, testing the foil ash content and analyzing its composition are of great importance. However, existing foil ash detection methods, such as those described in patent CN119223802A, are typically based on weighing methods, which cannot determine the composition of the foil ash. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a method for detecting electrode foil dust.

[0004] In a first aspect, a method for detecting electrode foil dust is provided, the method comprising:

[0005] Pretreatment: Take two pieces of electrode foil with the same area and place them in a first container and a second container respectively for ultrasonic cleaning. After cleaning, let them stand and take out the electrode foil to obtain a first solution and a second solution;

[0006] Foil ash digestion: add a certain amount of hydrochloric acid to the first solution, let it stand at room temperature for a certain period of time, add a certain amount of hydrochloric acid and nitric acid to the second solution, let it stand at high temperature until the foil ash in the second solution is completely dissolved;

[0007] Foil ash detection: The solutions in the first and second containers are fixed to 1 L, and the aluminum content in each solution is tested. The aluminum content in the first container is wt1, and the aluminum content in the second container is wt2.

[0008] Determine the content of metallic aluminum and aluminum oxide in foil ash: the metallic aluminum content in foil ash is wt1, and the aluminum oxide content is wt3, where wt3=wt2-wt1.

[0009] As an achievable manner, a certain amount of hydrochloric acid is added to the first solution, and the solution is allowed to stand at 15-40° C. for at least 20 minutes to completely dissolve the metallic aluminum component in the first solution.

[0010] As a feasible method, before the volume of the solution in the first container is adjusted to 1 L, the method further includes: placing all the components in the first container in a high-speed centrifuge, rotating at 5000-9000 rpm for 5-25 minutes to allow the undissolved foil ash in the first container to settle, and taking out the solution in the first container.

[0011] As an achievable manner, a certain amount of hydrochloric acid and nitric acid is added to the second solution, and the mixture is reacted at 150-180° C. for at least 8 hours, so that the foil ash in the second solution is completely dissolved.

[0012] As a feasible method, ultrasonic cleaning is performed using an ultrasonic cleaning machine with a cleaning time of 2-15 minutes, a cleaning power of 0.5 kW, an ultrasonic frequency of 10 KHz, and a cleaning temperature of 5-35°C.

[0013] As a practical approach, the aluminum content in the solution was measured by inductively coupled plasma optical emission spectrometry.

[0014] As a feasible approach, the integration time of the device is: short wave 15 s, long wave 5 s, and auxiliary air flow 0.5 L / min.

[0015] According to the technical solution provided in the embodiments of this application, by performing qualitative and quantitative analysis on the foil ash on the surface of the electrode foil, the composition of the foil ash is determined based on the differences in the digestion conditions of aluminum and aluminum oxide. This method is simple to operate and has high accuracy. Furthermore, this application can determine the content of foil ash on the surface of the electrode foil through the above-mentioned detection method, providing a solution for detecting and screening defective electrode foil products, while achieving scientific management and control of electrode foil materials, thereby reducing the probability of breakdown or short circuit in aluminum electrolytic capacitors, and ultimately achieving the goal of improving the capacitor yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0017] Figure 1 Flowchart of the method for detecting electrode foil dust in this embodiment. DETAILED DESCRIPTION

[0018] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0019] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] Please refer to Figure 1 This embodiment provides a method for detecting electrode foil dust, the method comprising:

[0021] S1: Pretreatment: Two pieces of electrode foil with the same area are placed in a first container and a second container respectively for ultrasonic cleaning. After cleaning, the two pieces of electrode foil are allowed to stand and the electrode foil is removed to obtain a first solution and a second solution;

[0022] S2: Foil ash digestion: Add a certain amount of hydrochloric acid to the first solution, let it stand at room temperature for a certain period of time, add a certain amount of hydrochloric acid and nitric acid to the second solution, let it stand at high temperature until the foil ash in the second solution is completely dissolved;

[0023] S3: Foil ash detection: The solutions in the first and second containers are fixed to 1 L, and the aluminum content in each solution is measured. The aluminum content in the first container is wt1, and the aluminum content in the second container is wt2.

[0024] S4: Determine the content of metallic aluminum and aluminum oxide in the foil ash: the content of metallic aluminum in the foil ash is wt1, and the content of aluminum oxide is wt3, where wt3=wt2-wt1.

[0025] The detection method provided in this application performs qualitative and quantitative analysis of the foil ash on the surface of the electrode foil. The composition of the foil ash is determined based on the differences in the digestion conditions of aluminum and aluminum oxide. This method is simple to operate and has high accuracy. Furthermore, this application can determine the content of foil ash on the surface of the electrode foil through the above-mentioned detection method, providing a solution for detecting and screening defective electrode foil products, while also achieving scientific management and control of electrode foil materials, thereby reducing the probability of breakdown or short circuit in aluminum electrolytic capacitors and ultimately achieving the goal of improving the capacitor yield.

[0026] In the above method, two pieces of electrode foil with the same area and the same sampling conditions are first provided. The two pieces of electrode foil are placed in different containers for ultrasonic cleaning. The containers contain the same volume of pure water. Preferably, an electrode foil with an area of 5*5cm is selected, and 50ml of pure water is placed in the container. The electrode foil area is selected appropriately to reflect the condition of the foil ash on the electrode foil and to fully digest the corresponding aluminum or aluminum oxide in the subsequent digestion reaction, so that the measured data truly reflects the condition of the foil ash on the electrode foil. The two pieces of electrode foil are placed in an ultrasonic cleaning machine for cleaning. The foil ash on the cleaned electrode foil falls into the pure water. The container containing the electrode foil is then allowed to stand to allow the foil ash that falls off the surface of the electrode foil to settle to the bottom of the solution. The electrode foil in the container is then removed to obtain a first solution and a second solution containing foil ash.

[0027] Preferably, ultrasonic cleaning is performed using an ultrasonic cleaning machine with a cleaning time of 2-15 minutes, a cleaning power of 0.5 kW, an ultrasonic frequency of 10 kHz, and a cleaning temperature of 5-35° C. The ultrasonic cleaning time is determined based on the amount of dust on the electrode foil. Generally, cleaning is performed at room temperature to ensure that all dust on the electrode foil falls off into pure water.

[0028] refer to Figure 1 As shown, aluminum or aluminum oxide is then digested in the first and second solutions under different conditions. For example, a certain amount of hydrochloric acid is added to the first solution and the reaction is carried out at room temperature, while a certain amount of hydrochloric acid and nitric acid are added to the second solution and the reaction is carried out at high temperature. This step takes advantage of the difference in the digestion conditions of aluminum and aluminum oxide. Since aluminum, as an active metal, readily reacts with hydrochloric acid at room temperature, while the aluminum oxide in the electrode foil is mostly γ,γ'-alumina, which is essentially insoluble in hydrochloric acid at room temperature but can be dissolved in a mixed solution of hydrochloric acid and nitric acid at high temperature, the first and second solutions are digested under different conditions by taking advantage of this difference. In the first solution under room temperature hydrochloric acid conditions, only aluminum dissolves into the solution, allowing the aluminum content in the solution to be detected. In the second solution under high temperature hydrochloric acid and nitric acid conditions, both aluminum and aluminum oxide dissolve, allowing the sum of the aluminum and aluminum oxide contents in the solution to be detected. Through calculation, the aluminum and aluminum oxide contents can be separately determined, resulting in a more accurate determination of the foil ash content on the electrode foil, providing a new and reliable method for analyzing the causes of foil ash generation by electrode foil manufacturers.

[0029] Preferably, a certain amount of hydrochloric acid is added to the first solution, and the solution is allowed to stand at 15-40° C. for at least 20 minutes to completely dissolve the metallic aluminum component in the first solution. Ensure that the first solution is fully reacted at room temperature.

[0030] Preferably, a certain amount of hydrochloric acid and nitric acid is added to the second solution and reacted at 150-180°C for at least 8 hours to completely dissolve the foil ash in the second solution. A certain amount of nitric acid and hydrochloric acid is added to the second solution and reacted at a high temperature of 150-180°C for 8-24 hours to completely dissolve the foil ash, ensuring that the aluminum and aluminum oxide in the second solution are completely dissolved.

[0031] The solutions after the reaction are diluted to the same volume and then tested. In this embodiment, the first and second solutions after the reaction are preferably diluted to 1 L and then tested using inductively coupled plasma optical emission spectrometry (ICP-OES) equipment to detect the corresponding contents. Before the solution in the first container is diluted to volume, all components in the first container are placed in a high-speed centrifuge and rotated at 5000-9000 rpm for 5-25 minutes to allow the undissolved foil ash in the first container to settle, and the solution in the first container is removed. Because the foil ash in the first container cannot be completely dissolved under hydrochloric acid conditions at room temperature, the undissolved solids in the first container need to be removed before testing so that the solution test results in the dissolved aluminum content. The aluminum content in the first container is wt1.

[0032] The solution in the second container was completely dissolved under high-temperature hydrochloric acid and nitric acid conditions. Therefore, the solution in the second container was directly diluted to 1 L, and the aluminum content in the solution was detected using the same ICP-OES (inductively coupled plasma optical emission spectrometry) as described above. The aluminum content in the second container was wt2, where the aluminum content in the second container included both metallic aluminum and aluminum oxide.

[0033] The equipment used in the above test method uses an integration time of 15 seconds for shortwave and 5 seconds for longwave, with an auxiliary gas flow of 0.5 L / min. The ICP-OES converts the test liquid into an aerosol through a nebulizer. In a high-temperature (approximately 10,000K) argon plasma, the aluminum element is atomized and excited to a high-energy state. When the excited aluminum atoms return to their ground state, they emit light of a specific wavelength. For example, aluminum has a sensitive spectral line at 167 nm (shortwave) or 396 nm (longwave). A spectrometer separates the light of different wavelengths, and a detector measures the intensity of the specific spectral lines. The aluminum concentration is calculated using a calibration curve.

[0034] Among them, the short-wave spectral line intensity of aluminum is weak and easily affected by background interference. Therefore, setting the short-wave integration time to 15s can improve the signal-to-noise ratio and ensure stable detection of weak signals. The long-wave spectral line intensity is higher and has less interference. Setting the integration time to 5 seconds can avoid signal saturation and improve analysis efficiency.

[0035] The measurement result of the solution in the first container is wt1, and the measurement result of the solution in the second container is wt2. Since when the foil ash is digested at room temperature, only the metallic aluminum in the foil ash can be dissolved, and the aluminum oxide therein cannot be dissolved, wt1 is the content of metallic aluminum in the foil ash on the surface of the sampling electrode foil. When the foil ash is digested at high temperature, both the metallic aluminum and aluminum oxide in the foil ash will dissolve, then wt2 is the total content of metallic aluminum and aluminum oxide in the foil ash on the surface of the sampling electrode foil, and wt2-wt1=wt3 is the content of aluminum oxide in the foil ash on the surface of the sampling electrode foil.

[0036] In the actual production process of capacitors, processes such as cutting, winding, and impregnation will cause unstable large particles on the surface of the electrode foil to fall off, rather than just falling off naturally. The above steps can determine the weight and composition of the foil ash on the surface of the sampled electrode foil, more accurately measure the foil ash content and composition of the electrode foil, and perform qualitative and quantitative analysis of the foil ash, providing new ideas and references for the next operation and corresponding process steps.

[0037] For example, if the aluminum content in the foil ash is high, it indicates that the corrosion foil selected during the manufacturing of the electrode foil may have the possibility of surface structure peeling and falling off; if the aluminum oxide content in the foil ash is high, it indicates that the foil ash may have fallen off from the aluminum oxide structure on the surface of the electrode foil, then the manufacturing process has poor control over mechanical strength and the process needs to be adjusted appropriately.

[0038] In summary, the detection solution provided in this application is not only conducive to improving the yield of capacitors, but also more conducive to analyzing problems in the electrode foil production process, thereby improving the overall technical level of the industry.

[0039] The following is a specific implementation method for detecting foil dust on the electrode foil surface:

[0040] Example 1: The specific steps are as follows:

[0041] Electrode foil pretreatment: Take two pieces of 5*5cm brand A electrode foil, weigh 0.095g, and then place them in the first container and the second container respectively for use; add 50ml of pure water to each container to ensure that the electrode foil is completely immersed in the pure water; place the two containers in an ultrasonic cleaner and clean for 5 minutes at a cleaning temperature of 30°C; then, take the two containers out of the ultrasonic cleaner and let them stand for 1 hour to allow the aluminum powder fallen off the surface of the electrode foil to settle to the bottom of the solution; then, take out the electrode foil.

[0042] Digestion and detection of foil ash at room temperature: add 6 ml of hydrochloric acid to the first container and let it stand at 30°C for 20 minutes. Place all the components in the first container in a high-speed centrifuge at 8000 rpm for 5 minutes, then remove the solution and dilute it to 1 L. Use ICP-OES to test the aluminum content in the solution, which is 0.05% by weight.

[0043] High-temperature digestion and analysis of foil ash: Add 6 mL of hydrochloric acid and 2 mL of nitric acid to a second container and incubate at 170°C for 8 hours. The solution in the second container is brought to 1 L and measured by ICP-OES to determine the aluminum content (wt2) of 0.29%.

[0044] Calculation: wt1 is the aluminum content in the foil ash on the surface of a 5 x 5 cm piece of electrode foil A. wt2 is the total aluminum and aluminum oxide content of the foil ash. wt3 = wt2 - wt1 = 0.24%, which is the aluminum oxide content in the foil ash on the surface of a 5 x 5 cm piece of electrode foil.

[0045] Example 2: The specific steps are as follows:

[0046] Electrode Foil Pretreatment: Take two 5x5cm pieces of Brand B electrode foil, weighing 0.103g, and place them in the first and second containers, respectively, for later use. Add 50ml of pure water to each container, ensuring that the electrode foil is completely submerged. Place both containers in an ultrasonic cleaner and clean for 15 minutes at 15°C. Remove the containers from the ultrasonic cleaner and let them sit for 2 hours to allow any aluminum powder that has fallen off the surface of the foil to settle to the bottom of the solution. Then, remove the electrode foil.

[0047] Foil ash digestion and testing at room temperature: Add 9 mL of hydrochloric acid to the first container and incubate at 30°C for 10 minutes. Centrifuge all contents at 7000 rpm for 10 minutes. Remove the solution and dilute to 1 L. ICP-OES analysis reveals an aluminum content of 0.08% by weight.

[0048] High-temperature digestion and analysis of foil ash: Add 9 mL of hydrochloric acid and 3 mL of nitric acid to a second container and incubate at 180°C for 20 h. The solution in the second container is brought to 1 L and measured by ICP-OES. The aluminum content in the solution is 0.27% by weight.

[0049] Calculation: wt1 is the aluminum content in the ash on the surface of a 5 x 5 cm piece of electrode foil B. wt2 is the total aluminum and aluminum oxide content. wt3 = wt2 - wt1 = 0.19%, which is the aluminum oxide content in the ash on the surface of a 5 x 5 cm piece of electrode foil.

[0050] Example 3: The specific steps are as follows:

[0051] Electrode Foil Pretreatment: Take two 5x5cm pieces of Grade C electrode foil, weighing 0.0898g, and place them in the first and second containers, respectively, for later use. Add 50ml of pure water to each container, ensuring that the electrode foil is completely submerged. Place both containers in an ultrasonic cleaner and clean for 2 minutes at 35°C. Then, remove both containers from the ultrasonic cleaner and let them sit for 1 hour to allow any aluminum powder that has fallen off the surface of the electrode foil to settle to the bottom of the solution. Then, remove the electrode foil.

[0052] Foil ash digestion and testing at room temperature: Add 2 mL of hydrochloric acid to the first container and incubate at 30°C for 20 minutes. Centrifuge all contents at 8000 rpm for 5 minutes. Remove the solution and dilute to 1 L. ICP-OES analysis reveals an aluminum content of 0.03% by weight.

[0053] Foil ash high-temperature digestion and testing: Add 2 mL of hydrochloric acid and 0.5 mL of nitric acid to a second container and incubate at 170°C for 24 hours. The solution in the second container is brought to 1 L and measured by ICP-OES to determine the aluminum content (wt2) of 0.20%.

[0054] Calculation: wt1 is the aluminum content in the ash on the surface of a 5 x 5 cm piece of C electrode foil. wt2 is the total aluminum and aluminum oxide content. wt3 = wt2 - wt1 = 0.17%, which is the aluminum oxide content in the ash on the surface of a 5 x 5 cm piece of electrode foil.

[0055] Example 4: A method for detecting foil dust on the surface of an electrode foil, the specific steps are as follows:

[0056] Electrode Foil Pretreatment: Take two 5x5cm pieces of Grade D electrode foil, weighing 1.08g, and place them in the first and second containers, respectively, for later use. Add 50ml of pure water to each container, ensuring that the electrode foil is completely submerged. Place both containers in an ultrasonic cleaner and clean them for 5 minutes at 30°C. Then, remove the containers from the ultrasonic cleaner and let them sit for 1 hour to allow any aluminum powder that has fallen off the surface of the electrode foil to settle to the bottom of the solution. Then, remove the electrode foil.

[0057] Digestion and testing of foil ash at room temperature: Add 6 mL of hydrochloric acid to the first container and incubate at 30°C for 20 minutes. Centrifuge all contents at 7000 rpm for 15 minutes. Remove the solution and dilute to 1 L. ICP-OES analysis reveals an aluminum content of 0.02% by weight.

[0058] High-temperature digestion and analysis of foil ash: Add 6 mL of hydrochloric acid and 2 mL of nitric acid to a second container and incubate at 180°C for 12 hours. The solution in the second container is brought to 1 L and measured by ICP-OES. The aluminum content in the solution is 0.26% by weight.

[0059] Calculation: wt1 is the aluminum content in the ash on the surface of a 5 x 5 cm piece of electrode foil D. wt2 is the total aluminum and aluminum oxide content of the ash. wt3 = wt2 - wt1 = 0.24%, which is the aluminum oxide content in the ash on the surface of a 5 x 5 cm piece of electrode foil.

[0060] The above detection method can qualitatively and quantitatively detect foil ash in electrode foil and accurately determine the foil ash content. This provides aluminum electrolytic capacitor manufacturers with a solution for promptly screening out defective electrode foil with high levels of foil ash, further enabling scientific management and control of electrode foil materials, thereby reducing the probability of breakdown and short circuits in aluminum electrolytic capacitors and ultimately achieving the goal of improving capacitor yields.

[0061] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate orientations or positional relationships are 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, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the directional terms "inside" and "outside" refer to the inside and outside relative to the outline of each component itself. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0062] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0063] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. A method for detecting electrode foil dust, characterized in that: include: Pretreatment: Take two pieces of electrode foil with the same area and place them in a first container and a second container respectively for ultrasonic cleaning. After cleaning, let them stand and take out the electrode foil to obtain a first solution and a second solution; Foil ash digestion: add a certain amount of hydrochloric acid to the first solution, let it stand at room temperature for a certain period of time, add a certain amount of hydrochloric acid and nitric acid to the second solution, let it stand at high temperature until the foil ash in the second solution is completely dissolved; Foil ash detection: The solutions in the first and second containers were diluted to 1 L, and the aluminum content in each solution was tested. The aluminum content in the first container was wt1, and the aluminum content in the second container was wt2. Determine the content of metallic aluminum and aluminum oxide in foil ash: the metallic aluminum content in foil ash is wt1, and the aluminum oxide content is wt3, where wt3=wt2-wt1.

2. The method for detecting electrode foil dust according to claim 1, characterized in that: A certain amount of hydrochloric acid is added to the first solution, and the solution is allowed to stand at 15-40° C. for at least 20 minutes to completely dissolve the metallic aluminum component in the first solution.

3. The method for detecting electrode foil dust according to claim 2, characterized in that: Before the volume of the solution in the first container is adjusted to 1 L, the process further includes: placing all the components in the first container in a high-speed centrifuge, rotating at 5000-9000 rpm for 5-25 minutes to allow the undissolved foil ash in the first container to settle, and taking out the solution in the first container.

4. The method for detecting electrode foil dust according to claim 1, characterized in that: A certain amount of hydrochloric acid and nitric acid is added to the second solution, and the mixture is reacted at 150-180° C. for at least 8 hours, so that the foil ash in the second solution is completely dissolved.

5. The method for detecting electrode foil dust according to claim 1, characterized in that: The ultrasonic cleaning is carried out using an ultrasonic cleaning machine with a cleaning time of 2-15 minutes, a cleaning power of 0.5 kW, an ultrasonic frequency of 10 KHz, and a cleaning temperature of 5-35°C.

6. The method for detecting electrode foil dust according to claim 1, characterized in that: The aluminum content in the solution was measured by inductively coupled plasma optical emission spectrometry.

7. The method for detecting electrode foil dust according to claim 6, characterized in that: The integration time of the device is: short wave 15 s, long wave 5 s, auxiliary air flow 0.5 L / min.

Images