Pretreatment solution for detecting a formation foil and a method for detecting a formation foil

Abstract

The application provides a pretreatment liquid for detecting formation foil and a detection method of formation foil. The pretreatment liquid comprises the following components in parts by mass: 75-85 parts of ethylene glycol; 5-10 parts of ammonium formate; 3-8 parts of salicylic acid; 0.8-1.2 parts of phosphoric acid; and 5-8 parts of water. The detection method of formation foil comprises the following steps: S1, cutting the formation foil to be detected into a detection sample; S2, immersing the detection sample in the pretreatment liquid, and soaking at a temperature of 85±2 DEG C for 100±5 minutes; and S3, taking out the detection sample in the pretreatment liquid, and detecting the detection sample after cleaning. The pretreatment liquid can perform deterioration treatment on the formation foil to be detected, so that the formation foil is closer to the actual use state, and the efficiency and accuracy of the detection of the formation foil are improved.

Description

Technical Field

[0001] This application relates to the field of electrolytic foil production and testing technology, specifically to pretreatment solutions and methods for electrolytic foil testing. Background Technology

[0002] In recent years, with the application of capacitors such as aluminum electrolytic capacitors in high-end product fields, such as automotive and wind power generation, where product lifespan requirements are extremely high, the testing of conventional characteristics of electrolytic foil can no longer meet the high requirements of product characteristics in these fields.

[0003] In addition to improving process stability and product performance, the chemical foil industry has also put forward new requirements for the testing methods of product quality.

[0004] Existing methods for detecting chemically formed foil are inefficient and their accuracy cannot meet the process requirements for high-quality chemically formed foil products.

[0005] Therefore, researching detection methods for chemically formed foils with high efficiency and accuracy has become an urgent problem for those skilled in the art. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, this application provides a pretreatment solution and a method for detecting electroformed foil. By using a pretreatment solution with specific components, the sample for electroformed foil detection can be pretreated to improve detection efficiency and accuracy.

[0007] In a first aspect, this application provides a pretreatment solution for detecting electrolytic foil, the pretreatment solution comprising the following components in parts by weight:

[0008] 75-85 parts of ethylene glycol;

[0009] 5-10 parts of ammonium formate;

[0010] 3-8 parts of salicylic acid;

[0011] Phosphoric acid 0.8-1.2 parts;

[0012] 5-8 parts water.

[0013] In this composite catalyst system, ethylene glycol, ammonium formate, and salicylic acid constitute the catalyst, with phosphoric acid acting as the oxidant and water as the modifier. Under the action of this composite catalyst system, phosphoric acid can degrade the surface film of the formed foil test sample, making the physicochemical state of the sample closer to the actual usage state of the capacitor product, thus improving the accuracy of the performance testing of the formed foil.

[0014] In one alternative implementation, the pretreatment liquid comprises the following components in parts by weight:

[0015] 80 parts of ethylene glycol;

[0016] 8 parts of ammonium formate;

[0017] 5 parts salicylic acid;

[0018] 1 part phosphoric acid;

[0019] Water 6 parts.

[0020] In one alternative implementation, the conductivity of the pretreatment liquid is 6.8–7.2 ms / cm.

[0021] Secondly, this application provides a method for detecting electrolytic foil, comprising the following steps:

[0022] S1. Cut the chemical foil to be tested into test samples;

[0023] S2. Immerse the test sample in the pretreatment solution and soak it at 85±2℃ for 100±5 minutes.

[0024] S3. Remove the test sample from the pretreatment solution, clean the test sample, and then put it into the test solution for testing.

[0025] In one alternative implementation, the pretreatment liquid in step S2 comprises the following components in parts by weight:

[0026] 75-85 parts of ethylene glycol;

[0027] 5-10 parts of ammonium formate;

[0028] 3-8 parts of salicylic acid;

[0029] Phosphoric acid 0.8-1.2 parts;

[0030] 5-8 parts water.

[0031] In one alternative implementation, the test solution in step S3 is prepared from ammonium adipate and water, wherein the concentration of ammonium adipate is 150 g / L.

[0032] In one alternative implementation, the conductivity of the pretreatment liquid in step S2 is 6.8-7.2 ms / cm.

[0033] In one alternative implementation, the test items for the sample in step S3 include withstand voltage test and boost time test.

[0034] The beneficial effects of this application based on the technical solution provided by the aforementioned implementation method include:

[0035] (1) The pretreatment solution of this application can degrade the formed foil to be tested, making it closer to the actual use state and improving the efficiency and accuracy of formed foil testing.

[0036] (2) The pretreatment liquid of this application can accelerate the deterioration treatment of the formed foil by combining the composite catalyst system with the oxidant.

[0037] (3) The detection method of this application can improve the efficiency and accuracy of foil detection by controlling specific pretreatment liquid and pretreatment conditions. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart of the foil detection method of this application. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In this document, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0042] This application provides a pretreatment solution for the detection of electroformed foil, which can be used for pretreatment before the detection of electroformed foils such as electroformed aluminum foil.

[0043] Specifically, the pretreatment solution comprises the following components in parts by weight:

[0044] 75-85 parts of ethylene glycol;

[0045] 5-10 parts of ammonium formate;

[0046] 3-8 parts of salicylic acid;

[0047] Phosphoric acid 0.8-1.2 parts;

[0048] 5-8 parts water.

[0049] Ethylene glycol (C2H4(OH)2) serves as an organic solvent in the pretreatment solution. In addition, ethylene glycol, ammonium formate (CH5NO2), and salicylic acid (C6H4(OH)COOH) form a catalytic system. Through a specific ratio, the deterioration of the foil film in the pretreatment solution can be accelerated.

[0050] By adding phosphoric acid (H3PO4), it can undergo an oxidation reaction with the formed foil, especially with the film on the surface of the formed foil, which has a degrading effect. This makes the formed foil sample to be tested closer to the state after it is used in capacitor products, making the test results more accurate.

[0051] In this pretreatment solution, water is added as a modifier to adjust and improve the conductivity of the pretreatment solution.

[0052] In this application, the conductivity of the pretreatment solution is 6.8-7.2 ms / cm. By adjusting the conductivity of the pretreatment solution, the pretreatment effect of the foil formation can be guaranteed.

[0053] Preferably, the conductivity of the pretreatment solution can be 7.0 mS / cm.

[0054] Example 1

[0055] A pretreatment solution comprising the following components in parts by weight:

[0056] 80 parts of ethylene glycol;

[0057] 8 parts of ammonium formate;

[0058] 5 parts salicylic acid;

[0059] 1 part phosphoric acid;

[0060] Water 6 parts.

[0061] Preparation method: Prepare each component according to the above ratio. First, mix the components other than water, then add water and stir thoroughly to obtain the pretreatment solution.

[0062] Example 2

[0063] A pretreatment solution comprising the following components in parts by weight:

[0064] 85 parts of ethylene glycol;

[0065] 5 parts ammonium formate;

[0066] 8 parts salicylic acid;

[0067] 1.2 parts phosphoric acid;

[0068] 5 parts water.

[0069] Preparation method: Prepare each component according to the above ratio. First, mix the components other than water, then add water and stir thoroughly to obtain the pretreatment solution.

[0070] Example 3

[0071] A pretreatment solution comprising the following components in parts by weight:

[0072] 75 parts ethylene glycol;

[0073] 10 parts of ammonium formate;

[0074] 3 parts salicylic acid;

[0075] 0.8 parts phosphoric acid;

[0076] 8 parts water.

[0077] Preparation method: Prepare each component according to the above ratio. First, mix the components other than water, then add water and stir thoroughly to obtain the pretreatment solution.

[0078] This application also provides a method for detecting electroformed foil, which pre-treats the test sample with a pretreatment solution before detecting the electroformed foil, thereby improving the detection process and increasing detection efficiency and accuracy.

[0079] In some fields with high requirements for the quality of capacitor foil, the testing methods for withstand voltage and boost time are more stringent. These methods require the foil samples to be immersed in constant-temperature boiling water for an extended period, such as 5 or 6 hours, before conducting tests for withstand voltage and boost time. This significantly increases the testing time for high-quality capacitor foil, as the production process requires adjustments based on...

[0080] The electroforming foil testing method of this application does not require prolonged boiling water immersion. Instead, it accelerates the degradation of the electroforming foil test sample through immersion in a pretreatment solution to meet the testing requirements.

[0081] Specifically, the method for detecting electrolytic foil in this application includes the following steps:

[0082] S1. Cut the chemical foil to be tested into test samples;

[0083] S2. Immerse the test sample in the pretreatment solution and soak it at 85±2℃ for 100±5 minutes.

[0084] S3. Remove the test sample from the pretreatment solution, clean the test sample, and then put it into the test solution for testing.

[0085] Specifically, the pretreatment liquid in step S2 comprises the following components in parts by weight:

[0086] 75-85 parts of ethylene glycol;

[0087] 5-10 parts of ammonium formate;

[0088] 3-8 parts of salicylic acid;

[0089] Phosphoric acid 0.5-1.5 parts;

[0090] 5-8 parts water.

[0091] Specifically, the test solution in step S3 is prepared from ammonium adipate and water, with the concentration of ammonium adipate being 150 g / L.

[0092] Specifically, the conductivity of the pretreatment liquid in step S2 is 6.8-7.2 ms / cm.

[0093] Preferably, the conductivity of the test solution in step S3 is 180 ms / cm.

[0094] Specifically, the test items for the sample in step S3 include withstand voltage test and boost time test.

[0095] The voltage withstand parameter of the oxide film of the electroformed foil is an important parameter for measuring the quality and reliability of the oxide film, while the voltage rise time can directly reflect the hydration resistance of the oxide film.

[0096] The withstand voltage test method is as follows: Immerse the test sample in the test solution and perform constant current voltage increase at a constant current density. When the voltage increases to 90% of the voltage at which the foil is formed, start a predetermined time (e.g., 180s ± 10s) and record the voltage reached after that time as the withstand voltage value.

[0097] The voltage boosting time test method is as follows: place the test sample in the test solution and perform constant current boosting with a constant current density. The time required for the voltage to rise to 90% of the forming voltage of the foil is the voltage boosting time.

[0098] Example 4

[0099] A method for detecting electrolytic foil includes the following steps:

[0100] S1. Cut the chemical foil to be tested into test samples;

[0101] S2. Immerse the test sample in the pretreatment solution and soak it at 85±2℃ for 100±5 minutes.

[0102] Specifically, the pretreatment solution comprises the following components in parts by weight: 80 parts ethylene glycol, 8 parts ammonium formate, 5 parts salicylic acid, 1 part phosphoric acid, and 6 parts water. The pretreatment solution is obtained by mixing all components thoroughly.

[0103] S3. Take out the test sample from the pretreatment solution, clean the test sample and put it into the test solution for testing; wherein, the test solution is prepared by ammonium adipate and water, and the concentration of ammonium adipate is 150 g / L.

[0104] In step S3, after removing the test sample from the pretreatment solution, it is first washed with pure water, and then the test sample is placed into the test solution.

[0105] Specifically, conventional testing methods are used to perform voltage withstand tests and boost time tests on the test samples in the test solution.

[0106] Experimental Test

[0107] Five different voltage specifications of formed aluminum foil (9.0V, 21.0V, 51.0V, 120.0V, and 155.0V) were selected and tested in experimental and control groups respectively.

[0108] The experimental group used the detection method of Example 4.

[0109] The detection method for the control group is as follows:

[0110] a. Cut the chemical foil to be tested into test samples;

[0111] b. Immerse the test sample in pure water at 100℃ for 720 minutes;

[0112] c. Take the test sample from the pure water, clean the test sample and put it into the test solution for testing; the test solution is made of ammonium adipate and water, and the concentration of ammonium adipate is 150 g / L.

[0113] The test results are shown in Table 1.

[0114] Table 1. Comparative Experimental Results

[0115]

[0116] As observed from the aluminum foil characteristics tested at various voltages in Table 1, the test time using the pretreatment solution of this application is longer than that using pure water. This clearly shows that the pretreatment solution accelerates the damage to the aluminum foil. Therefore, the pretreatment solution can effectively and quickly determine the quality requirements of the oxide film on the aluminum foil, which is beneficial to the high-quality production of the aluminum foil forming process.

[0117] The technical solutions provided by the embodiments of this application have been described in detail above. Specific embodiments have been used to explain the principles and implementation methods of this application. The above description is only for the purpose of helping to understand the method and core mechanism of this application. At the same time, for those skilled in the art, there will be changes in specific embodiments and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A pretreatment solution for detecting electrolytic foil, characterized in that, The pretreatment solution comprises the following components in parts by weight: 75-85 parts of ethylene glycol; 5-10 parts of ammonium formate; 3-8 parts of salicylic acid; Phosphoric acid 0.8-1.2 parts; 5-8 parts water; The conductivity of the pretreatment solution is 6.8-7.2 ms / cm.

2. The pretreatment solution according to claim 1, characterized in that: The pretreatment solution comprises the following components in parts by weight: 80 parts of ethylene glycol; 8 parts of ammonium formate; 5 parts salicylic acid; 1 part phosphoric acid; Water 6 parts.

3. A method for detecting electrolytic foil, characterized in that, The method for detecting electrolytic foil includes the following steps: S1. Cut the chemical foil to be tested into test samples; S2. Immerse the test sample in the pretreatment solution and soak it at 85±2℃ for 100±5 minutes. S3. Remove the test sample from the pretreatment solution, clean the test sample, and then put it into the test solution for testing. The pretreatment liquid in step S2 comprises the following components in parts by weight: 75-85 parts of ethylene glycol; 5-10 parts of ammonium formate; 3-8 parts of salicylic acid; Phosphoric acid 0.8-1.2 parts; 5-8 parts water; The conductivity of the pretreatment solution is 6.8-7.2 ms / cm.

4. The method for detecting electrolytic foil according to claim 3, characterized in that: The pretreatment solution in step S2 comprises the following components in parts by weight: 80 parts of ethylene glycol; 8 parts of ammonium formate; 5 parts salicylic acid; 1 part phosphoric acid; Water 6 parts.

5. The method for detecting electrolytic foil according to claim 3, characterized in that: The test solution in step S3 is prepared from ammonium adipate and water, with the concentration of ammonium adipate being 150 g / L.

6. The method for detecting electrolytic foil according to claim 3, characterized in that: The conductivity of the test solution in step S3 is 180 ms / cm.

7. The method for detecting electrolytic foil according to claim 3, characterized in that: The tests performed on the samples in step S3 include withstand voltage test and boost time test.

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