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Manufacturing method of ultralow-voltage anodized aluminum foil

An anodizing, ultra-low voltage technology, applied in anodizing, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problem of no report on the removal of natural oxide film, achieve the improvement of the specific volume of aluminum foil, increase the specific volume of aluminum foil Effect

Active Publication Date: 2015-04-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no report on the removal of natural oxide film during anodization of aluminum electrolytic capacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Chemical pretreatment: soak the corroded aluminum foil in an aqueous solution of oxalic acid with a mass concentration of 3% for treatment, and then thoroughly clean it with deionized water to obtain a pretreated aluminum foil; wherein, the treatment temperature is 7°C, and the treatment The time is 120s;

[0021] 2) Formation of aluminum foil: immerse the pretreated aluminum foil in an aqueous ammonium adipate solution with a mass concentration of 12% at 80°C, at a voltage of 4V and 50mA / cm 2 Carry out continuous anodizing under the current density until the anode aluminum foil is formed;

[0022] 3) Heat treatment: heat-treat the anode aluminum foil at 460°C for 2 minutes to obtain heat-treated aluminum foil;

[0023] 4) Compensation formation: the heat-treated aluminum foil is again anodized under the conditions of step 2) to perform supplementation formation;

[0024] 5) Hydration resistance treatment: Treat the formed aluminum foil at 60°C in an aqueous hypoph...

Embodiment 2

[0027] 1) Chemical pretreatment: soak the corroded aluminum foil in an acid solution with a mass concentration of 0.01% for treatment, and then fully clean it with deionized water to obtain a pretreated aluminum foil; wherein, the solute in the acid solution is made of Composition of acetic acid and lactic acid with a mass ratio of 1:1, the processing temperature is 90°C, and the processing time is 1s;

[0028] 2) Formation of aluminum foil: immerse the pretreated aluminum foil in an aqueous ammonium adipate solution with a mass concentration of 2% at 50°C, at a voltage of 13V and 5mA / cm 2 Carry out continuous anodizing under the current density until the anode aluminum foil is formed;

[0029] 3) Heat treatment: heat-treat the anode aluminum foil at 300°C for 5 minutes to obtain heat-treated aluminum foil;

[0030] 4) Compensation formation: the heat-treated aluminum foil is again anodized under the conditions of step 2) to perform supplementation formation;

[0031] 5) Hyd...

Embodiment 3

[0034] 1) Chemical pretreatment: soak the corroded aluminum foil in an aqueous sodium hydroxide solution with a mass concentration of 5% for treatment, and then fully clean it with deionized water to obtain a pretreated aluminum foil; wherein, the treatment temperature is 25°C , the processing time is 100s;

[0035] 2) Aluminum foil formation: immerse the pretreated aluminum foil in 90°C, 5% ammonium adipate aqueous solution at a voltage of 7V and 100mA / cm 2 Carry out continuous anodizing under the current density until the anode aluminum foil is formed;

[0036] 3) Heat treatment: heat-treat the anode aluminum foil at 600°C for 3 minutes to obtain heat-treated aluminum foil;

[0037] 4) Compensation formation: the heat-treated aluminum foil is again anodized under the conditions of step 2) to perform supplementation formation;

[0038] 5) Hydration-resistant treatment: Treat the formed aluminum foil at 80°C in a phosphorus-containing compound solution with a mass concentrat...

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PUM

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Abstract

The invention relates to a manufacturing method of an ultralow-voltage anodized aluminum foil. The manufacturing method comprises the following steps: treating a corroded aluminum foil in soaking treatment liquid, and cleaning with deionized water, so as to obtain the pretreated aluminum foil; soaking the pretreated aluminum foil in an ammonium adipate water solution at 50-90 DEG C, and carrying out continuous anodization until an anode oxide film aluminum foil is formed; thermally treating the anode oxide film aluminum foil at 300-600 DEG C for 2-5 minutes, so as to obtain thermally treated aluminum foil; treating the thermally treated aluminum foil in a 0.01%-5% phosphorous compound water solution at 30-80 DEG C for 1-20 minutes, and then carrying out electrochemical treatment at the voltage of 4V-13V and the current density lower than or equal to 20mA / cm<2>, so as to obtain the ultralow-voltage anodized aluminum foil. Compared with an untreated anode aluminum foil, the specific volume of the ultralow-voltage anodized aluminum foil manufactured by virtue of the manufacturing method can be increased by 10%-20%.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and in particular relates to a method for manufacturing ultra-low voltage anodized aluminum foil. Background technique [0002] In recent years, with the rapid development of portable electronics, industrial frequency conversion, new energy, electric vehicles, high-speed rail transportation and other fields, aluminum electrolytic capacitors, which are indispensable in circuits, have been widely used, and their operating voltages are constantly moving towards ultra-high voltages. (>600V w , DC-Link application) and ultra-low voltage (<4V w , Solid capacitor application) direction extension, thus putting forward higher and higher requirements for the preparation technology of aluminum electrolytic capacitor anode aluminum foil. [0003] For ultra-low voltage aluminum electrolytic capacitors, due to the extremely small thickness of the oxide film (<10nm), the performance of a...

Claims

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Application Information

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IPC IPC(8): C25D11/06C25D11/20C25D7/06
CPCC25D7/0614C25D11/06C25D11/20
Inventor 徐友龙杜显锋王杰
Owner XI AN JIAOTONG UNIV
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