Aluminum electrolytic capacitor anode foil secondary corrosion liquid formula

A technology of aluminum electrolytic capacitors and corrosive liquids, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problem of high solubility on the surface of aluminum foil, and achieve the effect of improving bending strength and increasing electrostatic capacity

Active Publication Date: 2011-06-08
新疆广投桂东电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide four kinds of aluminum electrolytic capacitor anode foil secondary corrosion liquid formula, this formula all can solve the shortcoming that existing secondary corrosion process formula is too soluble to the surface of aluminum foil, Greatly improve the specific volume and strength of the anode foil

Method used

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  • Aluminum electrolytic capacitor anode foil secondary corrosion liquid formula

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Effect test

Embodiment 1

[0017] A formula of secondary corrosion solution using nitric acid as the anode foil of aluminum electrolytic capacitor, which is to put the aluminum foil after pretreatment and primary corrosion into 70.0℃, 0.8N HNO 3 In the solution, the applied current density is 0.085A / cm 2 Perform secondary corrosion for 12 minutes, and then perform normal post-justification. The 520Vf capacity and bending strength of the aluminum foil are shown in Table 1.

Embodiment 2

[0019] A formula based on nitric acid and adding a small amount of polyacrylic acid anion electrolyte is to put the aluminum foil after pretreatment and primary corrosion into 70.0℃, 0.8N HNO 3 In the mixed solution with 0.7g / L polyacrylic acid, the applied current density is 0.085A / cm 2 Perform secondary corrosion for 12 minutes, and then perform normal post-justification. The 520Vf capacity and bending strength of the aluminum foil are shown in Table 1.

Embodiment 3

[0021] A formula that uses nitric acid as the main raw material and adds a small amount of compounds containing chloride ions. It is to put the aluminum foil after pretreatment and primary corrosion into 70.0°C, 0.8N HNO 3 In the mixed solution with 0.2N HCl, the applied current density is 0.085A / cm 2 Perform secondary corrosion for 12 minutes, and then perform normal post-justification. The 520Vf capacity and bending strength of the aluminum foil are shown in Table 1.

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Abstract

The invention provides an aluminum electrolytic capacitor anode foil secondary corrosion liquid formula, which is characterized in that nitric acid which has small corrosion capability to aluminum is used as corrosion liquid, or nitric acid is used as main corrosion liquid, and is added with a small amount of compound containing chlorine ion, or a small amount of polyacrylic acid anion electrolyte, or mixture of compound containing chlorine ion and a small amount of polyacrylic acid anion electrolyte to be used as the secondary corrosion liquid. The invention has advantages that because nitric acid which has small corrosion capability to aluminum is used as corrosion liquid, or a small amount of compound containing chlorine ion or a small amount of polyacrylic acid anion electrolyte or mixture thereof is added to nitric acid to be used as the secondary corrosion liquid, disadvantage that aluminum foil surface solubility to the secondary corrosion process formula is too large is solved, so that electrostatic capacity and crippling strength of the aluminum foil can be increased.

Description

technical field [0001] The invention relates to an electrochemical corrosion solution for metal aluminum foil, in particular to the formula of the secondary corrosion solution for the anode foil of an aluminum electrolytic capacitor. Background technique [0002] The main function of the aluminum electrolytic capacitor anode foil corrosion process is to expand the specific surface area of ​​the aluminum foil while ensuring that the projected area of ​​the aluminum foil remains unchanged, and then to improve the anode foil for electrolytic capacitors (hereinafter referred to as the forming foil) after the next energizing process. The purpose of electrostatic capacity. The current corrosion process is generally: pre-treatment → primary corrosion → secondary corrosion → post-treatment. The role of the pretreatment is to remove the oil and natural oxide film on the surface of the aluminum foil, and to activate the aluminum foil evenly, so as to facilitate the formation of initi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/04H01G9/045H01G9/055
Inventor 宋洪洲蔡小宇
Owner 新疆广投桂东电子科技有限公司
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