Pretreatment liquid for formed foil detection and formed foil detection method

Abstract

The invention provides pretreatment liquid for formed foil detection and a formed foil detection method. 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 to 1.2 parts of phosphoric acid; and 5-8 parts of water. The formed foil detection method comprises the following steps: S1, cutting a to-be-detected formed foil into a detection sample; s2, immersing the detection sample in the pretreatment liquid, and soaking for 100 + / -5 minutes at the temperature of 85 + / -2 DEG C; and S3, taking out the detection sample in the pretreatment liquid, cleaning the detection sample, and putting the detection sample into the test liquid for detection. The pretreatment liquid can be used for carrying out degradation treatment on the to-be-detected formed foil, so that the to-be-detected formed foil is closer to an actual use state, and the detection efficiency and accuracy of the formed foil are improved.

Description

Technical Field

[0001] The present application relates to the technical field of chemical foil production and detection, and in particular to a pretreatment liquid for chemical foil detection and a chemical foil detection method. Background Art

[0002] In recent years, with the application of aluminum electrolytic capacitors and other capacitors in high-end product fields, such as automotive and wind power generation, which have extremely high requirements for product life, the detection of conventional properties of formed foil can no longer meet the high requirements of product characteristics in these fields.

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

[0004] The existing chemical foil detection methods are inefficient and their accuracy cannot meet the process requirements of high-quality chemical foil products.

[0005] Therefore, it becomes an urgent problem to be solved by those skilled in the art to study a chemical foil detection method with high detection efficiency and accuracy. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present application provides a pretreatment liquid for chemical foil detection and a chemical foil detection method. The pretreatment liquid with specific components can pre-treat the chemical foil detection sample to improve the detection efficiency and accuracy.

[0007] In a first aspect, the present application provides a pretreatment solution for chemically formed foil detection, the pretreatment solution comprising 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

[0008] Among them, ethylene glycol, ammonium formate and salicylic acid constitute a composite catalyst system, phosphoric acid is used as an oxidant, and water is used as a modifier. Under the action of the composite catalyst system, phosphoric acid can deteriorate the surface film of the chemical foil test sample, making the physical and chemical state of the chemical foil test sample closer to the actual use state of the capacitor product, and improving the accuracy of the detection of the performance of the chemical foil.

[0009] In an optional implementation, the pretreatment solution includes the following components in parts by weight: 80 parts of ethylene glycol; 8 parts of ammonium formate; Salicylic acid 5 parts; Phosphoric acid 1 part; 6 parts water.

[0010] In an alternative implementation, the conductivity of the pretreatment solution is 6.8-7.2 ms / cm.

[0011] In a second aspect, the present application provides a method for detecting a formed foil, comprising the following steps: S1. Cutting the chemical foil to be tested into test samples; S2. Immerse the test sample in the pretreatment solution at 85±2℃ for 100±5 minutes; S3, taking out the test sample from the pretreatment solution, washing the test sample and placing it in the test solution for testing.

[0012] In an optional implementation, the pretreatment solution in step S2 includes 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.

[0013] In an optional implementation, the test solution in step S3 is prepared from ammonium adipate and water, and the concentration of ammonium adipate is 150 g / L.

[0014] In an optional implementation, the conductivity of the pretreatment liquid in step S2 is 6.8-7.2 ms / cm.

[0015] In an optional implementation, the test items of the sample in step S3 include a withstand voltage test and a voltage rise time test.

[0016] According to the technical solutions provided by the aforementioned implementations, the beneficial effects of this application include: (1) The pretreatment liquid of the present application can perform degradation treatment on the chemical foil to be tested, making it closer to the actual use state, thereby improving the efficiency and accuracy of chemical foil testing.

[0017] (2) The pretreatment solution of the present application can accelerate the deterioration treatment of the chemically formed foil by combining the composite catalyst system with the oxidant.

[0018] (3) The detection method of the present application can improve the efficiency and accuracy of chemical foil detection by controlling the specific pretreatment liquid and pretreatment conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 The figure is a flow chart of the chemically formed foil detection method of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] In this document, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0023] The present application provides a pretreatment liquid for chemically formed foil detection, which can be used for pretreatment of chemically formed foils such as chemically formed aluminum foil before detection.

[0024] Specifically, the pretreatment solution includes 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

[0025] Among them, ethylene glycol (C 2 H 4 (OH) 2 ) is used as the organic solvent of the pretreatment solution. On the other hand, ethylene glycol and the solute ammonium formate (CH 5 NO 2 ) and salicylic acid (C 6 H 4 The three (OH)COOH) form a catalytic system, which can accelerate the degradation of the film of the chemically formed foil in the pretreatment solution through a specific ratio.

[0026] By adding phosphoric acid (H 3PO 4 ), which can react with the chemical foil to produce an oxidation reaction, especially with the film on the surface of the chemical foil, causing degradation, making the chemical foil sample to be tested closer to the state of use after being applied to capacitor products, making the test results more accurate.

[0027] Water is added to the pretreatment solution as a conditioning agent to adjust and improve the conductivity of the pretreatment solution.

[0028] In the present application, the conductivity of the pretreatment liquid is 6.8-7.2 ms / cm. By adjusting the conductivity of the pretreatment liquid, the pretreatment effect of the formed foil can be ensured.

[0029] Preferably, the conductivity of the pretreatment liquid may be 7.0 ms / cm.

[0030] Example 1 A pretreatment solution, the pretreatment solution comprising the following components in parts by weight: 80 parts of ethylene glycol; 8 parts of ammonium formate; Salicylic acid 5 parts; Phosphoric acid 1 part; 6 parts water.

[0031] Preparation method: Prepare the components according to the above ratio, first mix the components except water, then add water, stir well to obtain the pretreatment solution.

[0032] Example 2 A pretreatment solution, the pretreatment solution comprising the following components in parts by weight: 85 parts of ethylene glycol; 5 parts of ammonium formate; Salicylic acid 8 parts; Phosphoric acid 1.2 parts; 5 parts water.

[0033] Preparation method: Prepare the components according to the above ratio, first mix the components except water, then add water, stir well to obtain the pretreatment solution.

[0034] Example 3 A pretreatment solution, the pretreatment solution comprising the following components in parts by weight: 75 parts of ethylene glycol; 10 parts of ammonium formate; 3 parts of salicylic acid; Phosphoric acid 0.8 parts; 8 parts water.

[0035] Preparation method: Prepare the components according to the above ratio, first mix the components except water, then add water, stir well to obtain the pretreatment solution.

[0036] The present application also provides a chemically formed foil detection method, which uses a pretreatment liquid to pretreat the detection sample before the chemically formed foil is detected, thereby improving the detection process and enhancing the detection efficiency and accuracy.

[0037] In some fields where the quality requirements for capacitor formed foil are high, the test methods for withstand voltage and voltage rise time of the formed foil are more stringent. The foil samples to be tested need to be immersed in constant temperature boiling water for a long time, such as 5 or 6 hours, before the withstand voltage and voltage rise time can be tested. This results in a significant increase in the testing time for high-quality formed foil. The chemical foil detection method of the present application does not require long-term boiling water immersion treatment, but instead accelerates the degradation of the chemical foil detection sample through immersion treatment in a pretreatment liquid, thereby meeting the detection requirements.

[0038] Specifically, the chemically formed foil detection method of the present application comprises the following steps: S1. Cutting the chemical foil to be tested into test samples; S2. Immerse the test sample in the pretreatment solution at 85±2℃ for 100±5 minutes; S3, taking out the test sample from the pretreatment solution, washing the test sample and placing it in the test solution for testing.

[0039] Specifically, the pretreatment solution in step S2 includes 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 0.5-1.5 parts; 5-8 parts water

[0040] Specifically, the test solution in step S3 is prepared from ammonium adipate and water, and the concentration of ammonium adipate is 150 g / L.

[0041] Specifically, the conductivity of the pretreatment liquid in step S2 is 6.8-7.2 ms / cm.

[0042] Preferably, the conductivity of the test liquid in step S3 is 180 ms / cm.

[0043] Specifically, the test items for the samples in step S3 include a withstand voltage test and a voltage rise time test.

[0044] The withstand voltage parameter of the oxide film of the chemical foil is an important parameter to measure the quality and reliability of the oxide film of the chemical foil, and the voltage rise time can directly reflect the hydration resistance of the oxide film of the chemical foil.

[0045] The withstand voltage test method is: immerse the test sample in the test liquid, increase the voltage at a constant current density, and when the voltage is increased to 90% of the voltage formed by the formed foil, the voltage reached after a predetermined time (such as 180s±10s) is recorded as the withstand voltage value.

[0046] The test method for the voltage rise time is as follows: the test sample is placed in the test liquid, and a constant current voltage is raised at a constant current density. The time required for the voltage to rise to 90% of the voltage formed by the formed foil is the voltage rise time.

[0047] Example 4 A method for detecting formed foil comprises the following steps: S1. Cutting the chemical foil to be tested into test samples; S2. Immerse the test sample in the pretreatment solution at 85±2℃ for 100±5 minutes; Specifically, the pretreatment liquid includes the following components in parts by weight: 80 parts of ethylene glycol, 8 parts of ammonium formate, 5 parts of salicylic acid, 1 part of phosphoric acid and 6 parts of water. The pretreatment liquid is obtained by uniformly mixing the components.

[0048] S3. Take out the test sample from the pretreatment solution, wash the test sample and put it into the test solution for testing; wherein the test solution is prepared from ammonium adipate and water, and the concentration of ammonium adipate is 150 g / L.

[0049] In step S3, after taking out the test sample from the pretreatment liquid, it is first washed with pure water, and then the test sample is placed in the test liquid.

[0050] Specifically, conventional testing methods are used to perform voltage withstand tests and voltage rise time tests on the test samples in the test liquid.

[0051] Experimental testing Five different voltage specifications of formed aluminum foils, namely 9.0V, 21.0V, 51.0V, 120.0V and 155.0V, were selected for testing in the experimental group and the comparison group respectively.

[0052] The experimental group adopted the detection method of Example 4.

[0053] The detection method of the comparison group is: a. Cut the chemical foil to be tested into test samples; b. Immerse the test sample in 100°C pure water for 720 minutes; c. Take out the test sample from the pure water, wash the test sample and put it into the test solution for testing; wherein the test solution is prepared from ammonium adipate and water, and the concentration of ammonium adipate is 150 g / L.

[0054] The test results are shown in Table 1.

[0055] Table 1. Comparative experimental results From the observation of the aluminum foil characteristics at various voltages tested in Table 1, it can be seen that the boost time tested using the pretreatment solution of the present application is longer than the pure water test time, which can clearly reflect the phenomenon that the pretreatment solution accelerates the destruction of the formed aluminum foil. This shows that the pretreatment solution can effectively make a clear and rapid judgment on the quality requirements of the oxide film of the formed aluminum foil, which is beneficial to the modulation of high-quality production of the aluminum foil forming process.

[0056] The technical solutions provided by the implementation methods of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The above description is only used to help understand the method and core mechanism of the present application. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific examples and application scopes. In summary, the contents of this specification should not be understood as limiting the present application.

Claims

1. A pretreatment solution for forming foil detection, 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.

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; Salicylic acid 5 parts; Phosphoric acid 1 part; 6 parts water.

3. The pretreatment solution according to claim 1, characterized in that: The conductivity of the pretreatment liquid is 6.8-7.2 ms / cm.

4. A method for detecting a chemically formed foil, characterized in that: The chemically formed foil detection method comprises the following steps: S1. Cutting the chemical foil to be tested into test samples; S2. Immerse the test sample in the pretreatment solution at 85±2℃ for 100±5 minutes; S3, taking out the test sample from the pretreatment solution, washing the test sample and placing it in the test solution for testing.

5. The chemically formed foil detection method according to claim 4, characterized in that: The pretreatment solution in step S2 includes 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.

6. The chemically formed foil detection method according to claim 4, characterized in that: The pretreatment solution in step S2 includes the following components in parts by weight: 80 parts of ethylene glycol; 8 parts of ammonium formate; Salicylic acid 5 parts; Phosphoric acid 1 part; 6 parts water.

7. The chemically formed foil detection method according to claim 4, characterized in that: The test solution in step S3 is prepared from ammonium adipate and water, and the concentration of ammonium adipate is 150 g / L.

8. The chemically formed foil detection method according to claim 4, characterized in that: The conductivity of the pretreatment liquid in step S2 is 6.8-7.2 ms / cm.

9. The chemically formed foil detection method according to claim 7, characterized in that: The conductivity of the test liquid in step S3 is 180 ms / cm.

10. The chemically formed foil detection method according to claim 4, characterized in that: The test items of the sample in step S3 include a withstand voltage test and a voltage rise time test.

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