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Method of pulsed deposition of nano tin dots on medium and high voltage anodic aluminium foils for aluminium electrolytic capacitors

A pulse deposition, anode aluminum foil technology, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems of reducing the mechanical properties of aluminum foil and restricting the uniformity and size consistency of aluminum foil, tin, zinc crystal nucleus distribution and so on

Active Publication Date: 2019-08-02
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, we found that when direct current electrodeposited tin and zinc crystal nuclei are used in the above patents, the distribution uniformity and size consistency of the obtained tin and zinc crystal nuclei are poor, and large corrosion pits are easily formed locally when the aluminum foil is induced to corrode. , large corrosion pits will significantly reduce the mechanical properties of the aluminum foil and limit the further improvement of the specific capacitance of the aluminum foil

Method used

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  • Method of pulsed deposition of nano tin dots on medium and high voltage anodic aluminium foils for aluminium electrolytic capacitors

Examples

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Embodiment 1

[0016] Put Mn, Fe, Co, Ni, Cu, Zn, Cd, Ga, Ge, In, Sn, Pb elements whose surface is not rich in electrode potential higher than aluminum, and high-purity medium-high-voltage aluminum foil with a purity of 99.99% at a temperature of 40°C , the solution composition is 0.5mol / L sodium hydroxide + 0.1mol / L potassium sodium tartrate for 30 seconds to remove the natural oxide film on the surface. Place the above-mentioned aluminum foil for pulse deposition, and the solution composition is: 0.01mol / L sodium stannate trihydrate + 0.5mol / L sodium hydroxide + 0.1mol / L potassium sodium tartrate; graphite is used as the anode, and the above-mentioned pretreated The medium and high voltage aluminum foil is used as the cathode, and the aluminum foil is charged into the electrolyte solution, where the temperature of the electroplating solution is 30°C, and the current density of pulse deposition is 40mA / cm 2 , the pulse time is 1s, the interval between each pulse is 1s, and the total time is...

Embodiment 2

[0019] Put Mn, Fe, Co, Ni, Cu, Zn, Cd, Ga, Ge, In, Sn, Pb elements whose surface is not enriched with higher electrode potential than aluminum, and high-purity medium-high-voltage aluminum foil with a purity of 99.99% at a temperature of 60°C , the solution composition is 1.5 mol / L sodium hydroxide + 0.3 mol / L potassium sodium tartrate and pretreated for 60 seconds to remove the natural oxide film on the surface. Place the above-mentioned aluminum foil for pulse deposition, and the solution composition is: 0.01mol / L sodium stannate trihydrate + 0.5mol / L sodium hydroxide + 0.1mol / L potassium sodium tartrate; graphite is used as the anode, and the above-mentioned pretreated The medium and high voltage aluminum foil is used as the cathode, and the aluminum foil is charged into the electrolyte solution, where the temperature of the electroplating solution is 30°C, and the current density of pulse deposition is 40mA / cm 2 , the pulse time is 1s, the interval between each pulse is 1s...

Embodiment 3

[0022] Put Mn, Fe, Co, Ni, Cu, Zn, Cd, Ga, Ge, In, Sn, Pb elements whose surface is not rich in electrode potential higher than aluminum, and high-purity medium-high-voltage aluminum foil with a purity of 99.99% at a temperature of 40°C , the solution is composed of 3.5mol / L sodium hydroxide + 0.5mol / L potassium sodium tartrate and pretreated for 150 seconds to remove the natural oxide film on the surface. Place the above aluminum foil for pulse deposition, and the solution composition is: 0.01mol / L sodium stannate trihydrate + 0.5mol / L sodium hydroxide + 0.1mol / L potassium sodium tartrate; graphite is used as the anode, and the above pretreated The medium and high voltage aluminum foil is used as the cathode, and the aluminum foil is charged into the electrolyte solution, where the temperature of the electroplating solution is 30°C, and the current density of pulse deposition is 40mA / cm 2 , the pulse time is 1s, the interval between each pulse is 1s, and the total time is 20 ...

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Abstract

The invention relates to the field of manufacturing medium and high voltage anode aluminum foils for aluminum electrolytic capacitors. The method is characterized in that the medium and high voltage anode aluminum foils with purity of 99.99% are pre-treated, Mn, Fe, Co, Ni, Cu, Zn, Cd, Ga, Ge, In, Sn and Pb elements with higher electrode potential than aluminum are not enriched on the surface of the medium and high voltage anode aluminum foils, an oxide film on the surface is removed, pulsed deposition is then employed, and the approximately orderly-distributed nano tin dots are deposited on the surface of the aluminum foils. The method is advantaged in that the medium-high voltage anode aluminum foils of which the surface is deposited with the nano tin dots is utilized, uniformity of generated tunnel holes can be significantly improved when the holes are electrolytically etched, tunnel hole merging is reduced, and thereby the specific capacitance of the aluminum foils can be increased.

Description

technical field [0001] The invention relates to the surface treatment technology and the corrosion porosity technology of medium and high voltage anode aluminum foils for aluminum electrolytic capacitors, which can significantly improve the corrosion porosity of the anode aluminum foil. Background technique [0002] With the continuous reduction in the volume of electronic machines and the development of high-density assembly, medium and high-voltage aluminum electrolytic capacitors as basic components are required to have the characteristics of high capacity and miniaturization to meet the development needs of electronic products. [0003] At present, the anode aluminum foil for medium and high voltage aluminum electrolytic capacitors generally generates a large number of tunnel holes on its surface by electrochemical corrosion to expand its specific surface area, thereby increasing the specific capacitance of the capacitor, so as to achieve high capacity and miniaturization...

Claims

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Application Information

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IPC IPC(8): H01G9/055H01G9/045C25D3/32C25D5/18
CPCC25D3/32C25D5/18H01G9/045H01G9/055
Inventor 彭宁温玉清尚伟
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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