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Surface modification method for enhancing specific volume of etched aluminum foil

A technology of corroding aluminum foil and surface modification, applied in surface reaction electrolytic coatings, capacitors, electrolytic capacitors, etc., can solve the problems of limited increase in specific volume of aluminum foil, hindering the uniform adhesion of precursors, and low pH value, etc. Adhesion performance, easy large-scale industrialization, low cost effect

Inactive Publication Date: 2015-05-06
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, in order to maintain the stability of the precursor, its pH value is generally kept low. At this time, the colloidal particles in the precursor are easy to absorb protons and are positively charged, and the aluminum foil is also positively charged in this acidic solution, resulting in electrostatic repulsion. , which hinders the uniform attachment of the precursor on the surface of the aluminum foil, resulting in a limited increase in the specific volume of the aluminum foil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Immerse the corroded aluminum foil in an aqueous solution of methylcellulose with a concentration of 0.008mol / L and a pH value of 7 at a temperature of 60°C for 20 minutes; after immersion, dry it at a temperature of 130°C to obtain improved Corrosion of aluminum foil;

[0016] 2) Immerse the modified corroded aluminum foil in an aqueous solution of niobium pentachloride with a concentration of 1 mmol / L, deposit a layer of niobium pentachloride precursor on the surface of the aluminum foil by physical adsorption, followed by heat treatment and anodic oxidation in sequence, to The aluminum oxide composite dielectric film of niobium pentoxide is formed on the corroded aluminum foil, and the surface modification of the corroded aluminum foil is completed. The voltage used in the anode polarization is 10V, and the current density is 100mA / cm 2 .

[0017] The aqueous solution of methylcellulose in this embodiment can also be replaced by an aqueous solution of cyclodextr...

Embodiment 2

[0019] 1) Immerse the corroded aluminum foil in an aqueous solution of propyl cellulose with a concentration of 0.05mol / L and a pH value of 4. The soaking temperature is 0°C and the soaking time is 60 minutes; after soaking, it is dried at 200°C to obtain the improved Corrosion of aluminum foil;

[0020] 2) Immerse the modified corroded aluminum foil in an aqueous solution of titanium sulfate with a concentration of 6mmol / L, deposit a layer of titanium sulfate precursor on the surface of the aluminum foil by physical adsorption, followed by heat treatment and anodic oxidation in order to form a layer of titanium sulfate on the modified corroded aluminum foil. Form an alumina composite dielectric film of titanium dioxide to complete the surface modification of the corroded aluminum foil; wherein, the heat treatment temperature is 500°C, the heat treatment time is 15min, the voltage used for anodic polarization is 200V, and the current density is 65mA / cm 2 .

[0021] The aqueou...

Embodiment 3

[0023] 1) Immerse the corroded aluminum foil into the triethylamine hydroxyacrylic acid cellulose aqueous solution with a concentration of 0.1mol / L and a pH value of 3. The soaking temperature is 80°C and the soaking time is 1min; after soaking, dry it at 30°C , to obtain modified corroded aluminum foil;

[0024] 2) Immerse the modified corroded aluminum foil in an aqueous solution of zirconium sulfate with a concentration of 50mmol / L, deposit a layer of zirconium sulfate precursor on the surface of the aluminum foil by chemical adsorption, and then heat treatment and anodic oxidation in sequence to form a layer of zirconium sulfate on the modified corroded aluminum foil. Form an alumina composite dielectric film of zirconia to complete the surface modification of corroded aluminum foil; the heat treatment temperature is 400°C, the heat treatment time is 30min, the voltage used for anodic polarization is 500V, and the current density is 20mA / cm 2 .

[0025] The aqueous soluti...

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Abstract

The invention relates to a surface modification method for enhancing specific volume of etched aluminum foil, which comprises the following steps: immersing etched aluminum foil in a 0.001-0.1 mol / L surfactant solution with the pH value of 3-7; after finishing immersion, baking to obtain modified etched aluminum foil; and immersing the modified etched aluminum foil in a precursor solution containing Ti, Zr, Nb or Ta, depositing a precursor layer containing Ti, Zr, Nb or Ta on the aluminum foil surface by physical adsorption or chemical adsorption, and sequentially carrying out heat treatment and anode oxidation to form a high-dielectric-constant aluminum oxide / oxide composite dielectric film on the modified etched aluminum foil, thereby completing the surface modification on the etched aluminum foil. The method has the advantages of simple implementation equipment and low cost of the surfactant, can easily implement large-scale industrialization, can obviously improve the film forming property of the high-dielectric oxide on the etched aluminum foil surface by surface treatment, and greatly enhances the specific volume of the aluminum foil after anode oxidation.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and in particular relates to a surface modification method for increasing the specific volume of corroded aluminum foil. Background technique [0002] Aluminum electrolytic capacitors are composed of an anode aluminum foil that has been corroded and anodized to form an aluminum oxide dielectric film, an electrolyte, and a corroded cathode aluminum foil. Since the capacitance of the cathode aluminum foil is much higher than that of the anode aluminum foil, the capacitance of the aluminum electrolytic capacitor is mainly determined by the anode aluminum foil. According to the specific volume formula C=εS·d -1 It can be seen that compounding a material with a higher dielectric constant than alumina into the alumina dielectric can increase the dielectric constant ε of the dielectric layer and increase the specific capacity of the anode aluminum foil, thereby reducing the amount of anode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/16H01G9/055H01G9/045
CPCC25D11/16H01G9/055
Inventor 徐友龙杜显锋门凯
Owner XI AN JIAOTONG UNIV