Method for manufacturing anode foil of alternating current motor capacitor

Abstract

The invention discloses a method for manufacturing anode foil of an alternating current motor capacitor. The method includes the steps of hydration processing, five-stage formation processing, high-temperature heat processing, depolarization processing, repairing formation processing, post-processing and drying processing, and is characterized in that the formation preprocessing step is additionally executed after the hydration processing step, the hydration processing step is that immersion processing is carried out with an ethanediol water solution, and the formation preprocessing step is that the corroded foil obtained after hydration processing is placed into a maleic acid solution for immersing processing. According to the method, hydration processing is carried out in the first stage of the anode oxide film forming working procedure with the ethanediol water solution, and the dielectric property of anode oxide film is improved; the corroded foil obtained after hydration processing is processed with the maleic acid to prevent the foil from being seriously corroded, and the water resisting property of the oxide film is finally achieved; formation is carried out with phosphoric acid and a saline solution of the phosphoric acid in first-stage formation processing and second-stage formation processing, and the specific volume is easily improved; meanwhile, due to the fact that phosphoric acid film is thin, the bending strength of the formed foil can be obviously improved.

Description

technical field

[0001] The invention relates to a method for manufacturing an anode foil used in AC motor capacitors, belonging to the field of anodized foil manufacturing for electrolytic capacitors. Background technique

[0002] The corrosion process uses the electronic light foil as the raw material, and the surface of the electronic light foil is etched by electrochemical methods to form holes, thereby increasing the surface area of ​​the cathode and anode light foils to increase their specific capacitance to make corrosion foils.

[0003] At present, there are many methods for preparing the anode foil of aluminum electrolytic capacitors in China. Generally, the corroded foil is subjected to high-temperature pure water treatment. The corroded foil first forms a layer of hydrated oxide film, and then in inorganic acid or organic acid or mixed acid. The formation voltage is used for formation treatment. After reaching the predetermined formation voltage, it is immersed in ...

Examples

Embodiment 1

[0027] A method of manufacturing an anode foil for an AC motor capacitor:

[0028] Hydration treatment: Take a corroded foil with penetrating corrosion holes and an average pore diameter of 1.5 μm, and immerse it in an ethylene glycol solution with a concentration of 0.1wt% and a temperature of 90°C for 5 minutes;

[0029] Chemical conversion pretreatment: then the concentration is 0.2wt%, the temperature is 75 ℃ maleic acid solution treatment time is 2 minutes;

[0030] Five-stage chemical conversion treatment: take it out and place it in phosphate with a concentration of 0.1wt%, at 75°C and a current density of 20mA / cm 2 10 minutes under the condition of voltage of 100V;

[0031] Take it out and place it in phosphate with a concentration of 0.05wt% and a temperature of 75°C, with a current density of 20mA / cm 2 10 minutes under the condition of voltage of 200V;

[0032] Take it out and wash it with water for 2 minutes; then place it in a solution with a concentration of 5w...

Embodiment 2

[0038] A method of manufacturing an anode foil for an AC motor capacitor:

[0039] Take a corroded foil with penetrating corrosion holes and an average pore diameter of 1.8 μm, and immerse it in an ethylene glycol solution with a concentration of 0.5wt% and a temperature of 90°C for 5 minutes;

[0040] Then the concentration is 0.2wt%, and the temperature is 75 ℃ maleic acid solution treatment time is 2 minutes;

[0041] Take it out and place it in phosphate with a concentration of 0.1wt%, at 75°C, with a current density of 20mA / cm 2 10 minutes under the condition of voltage of 100V;

[0042] Take it out and place it in phosphate with a concentration of 0.05wt% and a temperature of 75°C, with a current density of 20mA / cm 2 10 minutes under the condition of voltage of 200V;

[0043] Take it out and wash it with water for 2 minutes; then place it in a solution with a concentration of 5wt% boric acid and 0.2wt% ammonium pentaborate at a temperature of 75°C and a current densit...

Embodiment 3

[0049] Under the production conditions according to Example 1, the concentration of the water and the ethylene glycol solution in the treatment step was controlled at 1.0 wt%.

[0050] The dielectric properties of the oxide film of the anode foil produced based on this embodiment are good, and the leakage current is 57.3 uA / 5cm 2 ; High hydration resistance, Tr60 is 7S; bending strength is 122 times. From the observation of SEM scanning electron microscope, there is almost no hydrated oxide film on the surface of the oxide film, which can meet the needs of frequent charging and discharging of the motor starting capacitor.

technical field

[0001] The invention relates to a method for manufacturing an anode foil used in AC motor capacitors, belonging to the field of anodized foil manufacturing for electrolytic capacitors. Background technique

[0002] The corrosion process uses the electronic light foil as the raw material, and the surface of the electronic light foil is etched by electrochemical methods to form holes, thereby increasing the surface area of ​​the cathode and anode light foils to increase their specific capacitance to make corrosion foils.

[0003] At present, there are many methods for preparing the anode foil of aluminum electrolytic capacitors in China. Generally, the corroded foil is subjected to high-temperature pure water treatment. The corroded foil first forms a layer of hydrated oxide film, and then in inorganic acid or organic acid or mixed acid. The formation voltage is used for formation treatment. After reaching the predetermined formation voltage, it is immersed in ...

Examples

Embodiment 1

[0027] A method of manufacturing an anode foil for an AC motor capacitor:

[0028] Hydration treatment: Take a corroded foil with penetrating corrosion holes and an average pore diameter of 1.5 μm, and immerse it in an ethylene glycol solution with a concentration of 0.1wt% and a temperature of 90°C for 5 minutes;

[0029] Chemical conversion pretreatment: then the concentration is 0.2wt%, the temperature is 75 ℃ maleic acid solution treatment time is 2 minutes;

[0030] Five-stage chemical conversion treatment: take it out and place it in phosphate with a concentration of 0.1wt%, at 75°C and a current density of 20mA / cm 2 10 minutes under the condition of voltage of 100V;

[0031] Take it out and place it in phosphate with a concentration of 0.05wt% and a temperature of 75°C, with a current density of 20mA / cm 2 10 minutes under the condition of voltage of 200V;

[0032] Take it out and wash it with water for 2 minutes; then place it in a solution with a concentration of 5w...

Embodiment 2

[0038] A method of manufacturing an anode foil for an AC motor capacitor:

[0039] Take a corroded foil with penetrating corrosion holes and an average pore diameter of 1.8 μm, and immerse it in an ethylene glycol solution with a concentration of 0.5wt% and a temperature of 90°C for 5 minutes;

[0040] Then the concentration is 0.2wt%, and the temperature is 75 ℃ maleic acid solution treatment time is 2 minutes;

[0041] Take it out and place it in phosphate with a concentration of 0.1wt%, at 75°C, with a current density of 20mA / cm 2 10 minutes under the condition of voltage of 100V;

[0042] Take it out and place it in phosphate with a concentration of 0.05wt% and a temperature of 75°C, with a current density of 20mA / cm 2 10 minutes under the condition of voltage of 200V;

[0043] Take it out and wash it with water for 2 minutes; then place it in a solution with a concentration of 5wt% boric acid and 0.2wt% ammonium pentaborate at a temperature of 75°C and a current densit...

Embodiment 3

[0049] Under the production conditions according to Example 1, the concentration of the water and the ethylene glycol solution in the treatment step was controlled at 1.0 wt%.

[0050] The dielectric properties of the oxide film of the anode foil produced based on this embodiment are good, and the leakage current is 57.3 uA / 5cm 2 ; High hydration resistance, Tr60 is 7S; bending strength is 122 times. From the observation of SEM scanning electron microscope, there is almost no hydrated oxide film on the surface of the oxide film, which can meet the needs of frequent charging and discharging of the motor starting capacitor.

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