Method of manufacturing aluminum material for electrolytic capacitor electrodes, aluminum material for electrolytic capacitor electrodes, anode material for aluminum electrolytic capacitors, and alumi

A technology for electrolytic capacitors and aluminum materials, applied in the direction of electrolytic capacitors, capacitors, anodic oxidation, etc., can solve problems such as uneven corrosion resistance, increased capacitance, and uneven surface layer characteristics of aluminum materials

Inactive Publication Date: 2007-04-04
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, when the surface layer is chemically removed, it is difficult to uniformly remove the surface layer because the surface of the aluminum material has uneven corrosion resistance before removing the surface layer, thus limiting the increase in capacitance
[0021] With the technique described in Patent Document 3, since the surface layer of the aluminum material is not uniform before washing, the surface layer of the aluminum material is not uniformly dissolved, making it difficult to obtain improved etching characteristics of the aluminum material after final annealing
[0022] Through the technology described in Patent Document 4, although heating oxidation before annealing is beneficial to the uniformity of the surface layer of the aluminum material, the characteristics of the surface layer of the aluminum material before removal are not uniform, thereby affecting the surface after washing, so by heating Oxidation is insufficient to improve uniformity and limits the increase in capacitance
[0023] In addition, although the characteristics of the oxidized surface of the aluminum material after the intermediate annealing are changed by the atmosphere in the intermediate annealing, which mainly affects the subsequent surface layer removal, there is no description about the intermediate annealing atmosphere in Patent Document 5

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1-1

[0359] The aluminum block is sequentially hot rolled, cold rolled, intermediate annealing and finish cold rolled. As shown in Table 5-1, the obtained flake aluminum material having a thickness of 110 μm and a purity of 99.99% was degreasing using n-hexane (step 1-1). After heating in the air at 150°C for 24 hours (step 2-1), it is immersed in a 20% by mass sulfuric acid solution at 80°C to remove the aluminum material surface layer with an average of 10 nm (step 4-1). Then, in an argon atmosphere, the material was subjected to final annealing at 540°C for 4 hours (step 5-1) to obtain an aluminum material for electrolytic capacitor electrodes.

example 2-1 to example 49-1

[0360] Example 2-1 to Example 49-1, Comparative Example 1-1 to Comparative Example 3-1

[0361] Under the conditions shown in Tables 5-1 to 7-1, aluminum materials for electrolytic capacitor electrodes were obtained.

[0362] The aluminum material obtained in each example and comparative example was immersed in HCL containing 1.0 mol / liter and HCL of 3.5 mol / liter. 2 SO 4 In the aqueous solution, the temperature of the solution is 75°C. At the same temperature, use a solution with the same composition at 0.2A / cm 2 The current density of the material is etched by applying a direct current electrode.

[0363] The electrolytically treated aluminum material is further immersed in a 90°C hydrochloric acid-sulfuric acid mixed solution with the same composition for 360 seconds, and then an etched foil with a larger diameter etch pit is obtained. According to the EIAJ standard, with a formation voltage of 270 volts, the obtained etched foil was formed into a medium by anodizing, thereby o...

example 1-2

[0417] The aluminum ingots having 0.0015 mass% Fe, 0.0022 mass% Si, and 0.0055 mass% Cu (composition 3-2) in Table 1-2 were hot rolled. The aluminum material having a thickness of 130 microns obtained by processing the plate obtained by cold rolling under the conditions shown in Table 6-2. That is, the intermediate annealing is applied in the air at 260°C for 18 hours (step 2-2). Then, finish cold rolling with a reduction of 20% is performed (step 5-2). After finishing cold rolling, the aluminum material is degreasing with n-hexane (step 6-2), and then the 4nm surface layer of the aluminum material is removed by immersing in a 20% mass sulfuric acid aqueous solution at 80° C. (step 7-2). Then, in an argon atmosphere, the aluminum material was subjected to final annealing at 530°C for 6 hours (step 8-2) to obtain an aluminum material for electrolytic capacitor electrodes.

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Abstract

A method for manufacturing an aluminum material used for an electrode of an electrolytic capacitor of the present invention, comprising the steps of heating the aluminum material in an oxidizing atmosphere, removing a surface layer of the aluminum material by washing the heated aluminum material, and treating the aluminum material obtained by washing Perform final annealing.

Description

[0001] Priority is claimed for the following applications: Japanese Patent Application 2004-040328 filed on February 17, 2004, Japanese Patent Application 2004-304717 filed on October 19, 2004, Japanese Patent Application 2004- filed on October 29, 2004 316592, Japanese Patent Application 2004-348837 filed on December 1, 2004, Japanese Patent Application 2004-377539 filed on December 27, 2004, U.S. Provisional Application 60 / 614,328 filed on September 30, 2004, October 2004 The United States provisional application 60 / 621,067 filed on November 25, and the United States provisional application 60 / 629,971 filed on November 23, 2004, the contents of which are incorporated herein by reference. [0002] Cross-references to related applications [0003] This application is filed under 35U.SC§111(a), and according to 35U.SC§119(e)(1), the U.S. provisional application filed on September 30, 2004 under 35U.SC§111(b) 60 / 614,328, the priority date of the U.S. provisional application 60 / 621,06...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/055C22F1/04C23G1/22C23F1/20C23F1/36C25D11/04
Inventor 西森秀树穗积敏加藤丰
Owner SHOWA DENKO KK
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