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Method and system for tin crystal nucleus in-situ deposition through aluminum foil surface sol-gel method

A surface sol-gel, in-situ deposition technology, applied in electrolytic capacitors, electrical components, circuits, etc., can solve the problems of suboptimal pores, large influence of crystal nucleus distribution, limited specific capacitance improvement, etc., and achieve small size. , uniform distribution, the effect of reducing corrosion and thinning

Active Publication Date: 2018-05-29
广西广投正润新材料科技有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The above scheme mainly improves the ability of the crystal nuclei to continuously guide the aluminum foil to corrode holes by increasing the bonding force between the deposited crystal nuclei and the aluminum foil substrate. , The impact of defects is large, so that the uniform pores of the aluminum foil guided by the crystal nucleus are not optimal, which limits the further improvement of the specific capacitance

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  • Method and system for tin crystal nucleus in-situ deposition through aluminum foil surface sol-gel method
  • Method and system for tin crystal nucleus in-situ deposition through aluminum foil surface sol-gel method

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Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 The shown system for in-situ deposition of tin nuclei by sol-gel method on the surface of aluminum foil is composed of an aluminum foil conveying device, a sol-spraying device arranged in sequence along the conveying direction of the aluminum foil, and an in-situ electrochemical dissolution deposition device for aluminum foil.

[0034] The sol throwing device is composed of two sets of sol throwing mechanisms arranged oppositely, and there is a space for the aluminum foil to pass between the two sets of sol throwing mechanisms. Both sets of sol throwing mechanisms include a sol tank 4 filled with tin sol solution, a feeding roller 3 and a bristle roller 2 with bristles arranged from bottom to top. The middle and lower parts of the feeding roller 3 are soaked in the tin sol solution. The bristles of the roller 2 are in contact with the peripheral surface of the feeding roller 3, and the bristles of the brush roller 2 and the feeding roller 3 rotate in th...

Embodiment 2

[0039] (1) The finished aluminum foil is recrystallized and annealed to form an Al with a purity of 99.99%, a thickness of 110 μm, a {100} surface texture occupancy of more than 95%, and trace amounts of Fe, Si, Cu, Zn, Ga, Mn on the surface and Aluminum foil not enriched with Pb.

[0040] (2) Pretreat the aluminum foil after recrystallization annealing in a solution containing 1.5mol / L sodium carbonate + 0.5mol / L sodium silicate + 1mol / L sodium hydroxide. The pretreatment temperature is 60°C and the time is For 20s, remove the dense oxide film formed after recrystallization annealing on both surfaces of the aluminum foil.

[0041] (3) throwing 0.1mol / L tin sol to the two surfaces of the pretreated aluminum foil, the temperature of the throwing sol is 40°C, the time is 10s, and the speed ratio between the brush roller 2 and the feeding roller 3 is 2, thus A uniform tin hydroxide sol layer with colloidal thickness is formed on both surfaces of the aluminum foil.

[0042] (4) ...

Embodiment 3

[0047] (1) The finished aluminum foil is recrystallized and annealed to form an Al with a purity of 99.99%, a thickness of 110 μm, a {100} surface texture occupancy of more than 95%, and trace amounts of Fe, Si, Cu, Zn, Ga, Mn on the surface and Aluminum foil not enriched with Pb.

[0048] (2) The aluminum foil after the recrystallization annealing treatment is pretreated in a solution containing 1.5mol / L sodium carbonate+0.5mol / L sodium silicate+1mol / L sodium hydroxide+0.2mol / L sodium citrate, The pretreatment temperature is 60° C. and the time is 20 s to remove the dense oxide film formed after recrystallization annealing on both surfaces of the aluminum foil.

[0049] (3) throwing 0.1mol / L tin sol to the surface of the pretreated aluminum foil, the temperature of the throwing sol is 40°C, the time is 10s, and the speed ratio between the brush roller 2 and the feeding roller 3 is 3, thus in A uniform tin hydroxide sol layer with colloidal thickness is formed on both surface...

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Abstract

The invention discloses a method for tin crystal nucleus in-situ deposition for medium-high-voltage anodes through a high-purity aluminum foil surface sol-gel method. The method includes the steps that firstly, an aluminum foil finished product is subjected to recrystallization annealing treatment, so that the {100} surface texture occupation rate is lager than 95%, the surface of the finished product comprises trace Fe, Si, Cu, Zn, Ga and Mn and is not enriched with Pb, and the purity of Al is 99.99%; secondly, the aluminum foil is pretreated in an alkaline solution to remove an oxidation film on the surface of the aluminum foil; thirdly, the surface of the pretreated pure aluminum foil is coated with a soil solution to form a uniform tin hydroxide sol layer; fourthly, a graphite electrode serves as an anode and the aluminum foil serves as a cathode to conduct in-situ electrochemical dissolving deposition, and nano tin crystal nucleuses are deposited on the surface of the aluminum foil in situ. The invention further discloses a system suitable for the method. The nano tin crystal nucleuses are small in size, and distribution is not influenced by rolling marks and defects on the surface of the aluminum foil and accordingly is more uniform.

Description

technical field [0001] The invention relates to the manufacture of aluminum foil for medium and high voltage aluminum electrolytic capacitors, in particular to a method and system for in-situ deposition of tin crystal nuclei on the surface of aluminum foil by sol-gel method. Background technique [0002] With the continuous shrinking of 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. At present, the anode aluminum foil for medium and high voltage aluminum electrolytic capacitors generally generates a large number of tunnel holes on the surface of the anode aluminum foil by electrochemical corrosion to expand its surface area, thereby increasing the specific capacitance of the capacitor and meeting the requirements of high capacity and mini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/30C25D5/44C25D7/06C25F3/20
CPCC25D3/30C25D5/44C25D7/06C25F3/20H01G9/055
Inventor 彭宁杨宏何业东陈家进
Owner 广西广投正润新材料科技有限公司
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