Industrial-frequency alternating-current anodic oxidation method of anode aluminum foil for aluminum electrolytic capacitor
A technology of aluminum electrolytic capacitors and anodic oxidation method, which is applied in the direction of electrolytic capacitors, electrolytic capacitor manufacturing, anodic oxidation, etc., can solve the problems of complex power circuits and high equipment costs, achieve the elimination of circuit systems, improve production efficiency, and improve compactness Effect
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Embodiment 1
[0022] Connect the two poles of the power frequency AC power supply to their respective corroded aluminum foils, and immerse them in 10% ammonium azelate solution at 90°C, at 3V, 1.5A / cm 2 , Anodizing under the condition of 60Hz. During the formation process, after the applied voltage increased to 3V, constant voltage anodization was carried out for 20min. Subsequently, the aluminum foil was heat-treated in an air atmosphere at 500° C. for 5 minutes, and then anodized under the same conditions as above for 2 minutes. Through the test, compared with the corroded aluminum foil after DC anodization, under the same withstand voltage, the specific capacitance value increases by 5%, the loss value decreases by 2%, and the production efficiency increases by 90%. The obtained anode aluminum foil leakage current parameter K=0.008μA·V -1 ·µF -1 .
Embodiment 2
[0024] Connect the two poles of the power frequency AC power supply to their respective corroded aluminum foils, and immerse them in 10% ammonium adipate solution at 25°C, at 20V, 0.6A / cm 2 , Anodizing under the condition of 50Hz. During the formation process, after the applied voltage increased to 20V, the constant voltage anodized for 10min. Subsequently, the aluminum foil was heat-treated in an air atmosphere at 400° C. for 10 minutes, and then anodized for 2 minutes under the same conditions as above. Through the test, compared with the corroded aluminum foil after DC anodization, under the same withstand voltage, the specific capacitance value increases by 1%, the loss value decreases by 2%, and the production efficiency increases by 80%. The obtained anode aluminum foil leakage current parameter K=0.004μA·V -1 ·µF -1 .
[0025] see figure 1 , 2 . in figure 1 It is a photograph of the cross-section morphology of the low-pressure corroded aluminum foil obtained by D...
Embodiment 3
[0027] Connect the two poles of the power frequency AC power supply to their respective corroded aluminum foils, and immerse them in 5% ammonium acetate solution at 60°C, at 100V, 0.7A / cm 2 , Anodizing under the condition of 55Hz. During the formation process, after the applied voltage increased to 100V, constant voltage anodization was carried out for 20min. Subsequently, the aluminum foil was heat-treated in an air atmosphere at 600° C. for 1 min, and then anodized for 2 min under the same conditions as above. Through the test, compared with the corroded aluminum foil after DC anodization, under the same withstand voltage, the specific capacitance value increases by 2%, the loss value decreases by 3%, and the production efficiency increases by 85%. The obtained anode aluminum foil leakage current parameter K=0.004μA·V -1 ·µF -1 .
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