Nano holing method on surface of low-voltage anode foil for aluminium electrolytic capacitor

A technology for aluminum electrolytic capacitors and low-voltage anode foils, which is applied in the direction of electrolytic capacitors, capacitors, capacitor manufacturing, etc., can solve the problems of poor general process applicability, large quality dispersion of electrolytic aluminum foils, and increased industrial costs.

Active Publication Date: 2005-03-23
GUANGDONG HUAFENG NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requires manufacturers to formulate corresponding surface hole layout and corrosion expansion processes for light foils from different sources, resulting in poor applicability

Method used

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  • Nano holing method on surface of low-voltage anode foil for aluminium electrolytic capacitor
  • Nano holing method on surface of low-voltage anode foil for aluminium electrolytic capacitor
  • Nano holing method on surface of low-voltage anode foil for aluminium electrolytic capacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Example 1: Use acetone to remove the surface grease on the surface of the aluminum foil, remove the oxide film with NaOH, then place it in a polishing solution at 70 ° C, apply a voltage of 10 V to perform electrochemical polishing for about 5 minutes, and the composition of the polishing solution is phosphoric acid: Sulfuric acid: glycerol (v / v) = 115: 0.5: 85; using 3% (wt) H 3 PO 4 For the electrolyte, an anodic oxidation was performed once at 60V for 15 minutes, and a mixed solution of 15% (wt) phosphoric acid and 5% (wt) chromic acid was used to remove the film at 60°C until the surface exposed the aluminum matrix, and then the second oxidation and removal Membranes, the conditions were the same as the first time. figure 1 The SEM photo of the surface of the aluminum foil after secondary oxidation by the above process shows that the surface is distributed with corrosion holes of relatively uniform size, the size of the holes is between 93 and 220nm, and the averag...

Embodiment 2

[0018] Example 2: According to the method in Example 1, the surface of the aluminum foil is routinely cleaned to remove oil and oxide film, and then it is placed in a polishing solution at 40°C, and a voltage of 6V is applied for electrochemical polishing for about 25 minutes. The composition is phosphoric acid: sulfuric acid: glycerol=150:0.7:100. Using 10% (wt) H 3 PO 4 As an electrolyte, an anodic oxidation is performed once at a voltage of 30V for 30 minutes, and a mixed solution of 6% (wt) phosphoric acid and 2% (wt) chromic acid is used to remove the film at 80°C until the surface exposes the aluminum matrix, and then perform secondary oxidation and removal. Membranes, the conditions were the same as the first time. On the surface of the aluminum foil, corrosion holes with a relatively uniform size were obtained, with an average pore diameter of 78nm.

Embodiment 3

[0019] Example 3: The surface of the aluminum foil is subjected to conventional surface cleaning such as degreasing and oxide film removal, and then it is placed in a polishing solution at 70° C., and a voltage of 18 V is applied for electrochemical polishing for about 3 minutes. The composition of the polishing solution is phosphoric acid: Sulfuric acid: glycerol=90:0.3:60. Using 8% (wt) H 3 PO 4 As an electrolyte, an anodic oxidation was performed once at a voltage of 80V for 15 minutes, and a mixed solution of 27% (wt) phosphoric acid and 10% (wt) chromic acid was used to remove the film at 40°C until the surface exposed the aluminum matrix, and then the second oxidation and removal Membranes, the conditions were the same as the first time. On the surface of the aluminum foil, pits with relatively uniform size are obtained (see figure 2 ), the pore size is between 136 and 274nm, and the average pore diameter is 220nm. exist figure 2 The middle and thin lines are the ...

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Abstract

The aluminium electrolytic capacitor uses the superficial nanometer hole siting on the low-voltage anodic foil and relates to the hole siting on the surface of the foil, especially the method of the superficial nanometer hole siting on the low-voltage anodic foil used in the aluminium electrolytic capacitor. The aluminum foil is cleaned and electro chemically polished by the polishing fluid, whose components are phosphoric acid: vitriol: glycerin=80-160:0.1-1:50-100. After polishing, the aluminum foil is put into the phosphoric acid solution, goes through the preliminary anodic oxidation at the voltage of between 20V and 120V and is got rid of the film with the mixed solution of phosphoric acid and chromic acid until the aluminium matrix is naked. In the same condition with that of the preliminary anodic oxidation, the aluminum foil passes through the secondary oxidation and secondary film-eliminating. By adjusting the technological parameters, the pore space's density and aperture can be adjusted and the aperture varies between the 50nm and 300nm to adopt itself to the applied scale of the low-pressure foil.

Description

technical field [0001] The invention relates to a method for distributing holes on the surface of a foil, in particular to a method for distributing nanometer holes on the surface of a low-voltage anode foil of an aluminum electrolytic capacitor. Background technique [0002] Since the Germans manufactured the world's first high-purity aluminum foil electrolytic capacitor in 1938, due to its large capacitance per unit volume, self-healing properties of the oxide film, and low price, aluminum electrolytic capacitors have gradually become the most widely used electronic components. One of the devices. The development of science and technology has put forward higher and higher requirements for the miniaturization of electronic products. Since the capacitance of capacitors is closely related to the volume of capacitors, capacitors have become the most important factor restricting the miniaturization of electronic products. Improving the specific capacitance of aluminum foil for...

Claims

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Application Information

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IPC IPC(8): H01G9/055
Inventor 林昌健宋延华孙岚谭帼英谭惠忠
Owner GUANGDONG HUAFENG NEW ENERGY TECH CO LTD
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