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A leadless alloy designed electrolytic capacitor aluminum foil

A technology of electrolytic capacitors and lead-free alloys, applied in the direction of electrolytic capacitors, capacitors, circuits, etc., can solve problems such as human injury, achieve low prices, avoid enhancement, and promote the effect of uniform surface corrosion

Inactive Publication Date: 2009-07-08
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lead is a toxic carcinogen. If the relevant personnel absorb lead during the production, processing, use, waste and recycling of aluminum foil, it will cause harm to the human body.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] The following table shows the comparison of the cubic texture content and the distribution of corrosion pores in the examples of high-voltage anode aluminum foils, in which the content of trace elements such as Sn, Fe, Si, Cu, and Pb is in ppm. The results showed that all tin-containing aluminum foils achieved the goal of promoting uniform distribution of corrosion pits. The cubic texture occupancy rate of the low-tin content aluminum foil exceeds 95%, reaching the level of ordinary high-voltage anode aluminum foil and lead-containing aluminum foil; but when the tin content exceeds 20ppm, the cubic texture occupancy rate decreases significantly.

[0011] High Voltage Foil Example sn Fe Si Cu Pb Al cubic texture Pit distribution Ordinary high voltage foil -- 9 13 50 -- >99.98％ >95％ uneven Contains Pb0.5ppm -- 12 14 50 0.5 >99.98％ >95％ uniform Sn1 1 9 9 40 -- >99.98％ >95％ uniform Sn2 2 9 9 47 -- >...

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Abstract

The invention proposes a lead-free alloyed aluminum foil for electrolytic capacitors, which relates to the anode aluminum foil material of electrolytic capacitors. In its chemical composition, the purity of Al is greater than or equal to 99.98% by weight, and contains Si: 1-30ppm, Fe: 1-30ppm , Cu: 20-80ppm, Sn: 0.1-20ppm, and the remaining components are other impurities. The invention proposes to replace lead with tin in the aluminum foil to ensure the corrosion performance of the aluminum foil. Because it is lead-free and non-toxic, it is an environmentally friendly aluminum foil for electrolytic capacitors. At the same time, because the price of tin is low and no other trace elements are added, the increase in the cost of this environmentally friendly aluminum foil product can be avoided.

Description

technical field [0001] The invention belongs to the field of aluminum electrolytic capacitor materials, in particular to the anode aluminum foil material of electrolytic capacitors. Background technique [0002] Aluminum foil is an important material for the production of aluminum electrolytic capacitors. Through proper etching process, the surface area of ​​aluminum foil can be greatly increased, thereby obtaining high specific capacitance value. The standard electrode potential of lead ions is significantly higher than that of aluminum ions. Most of the trace lead atoms in the finished aluminum foil are enriched on the surface of the aluminum foil, which can significantly promote the generation of corrosion pits and promote the uniformity of corrosion pits on the surface of aluminum foil during the electrochemical corrosion process. distributed. The corrosion of high-voltage anode aluminum foil mainly corrodes vertically into the foil along the <100> direction, so ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/045C22C21/00
Inventor 毛卫民杨宏宋婧波
Owner UNIV OF SCI & TECH BEIJING