Methof for manufacturing foil of cathode of electrolytic capacitor
A technology for electrolytic capacitors and manufacturing methods, applied in capacitor manufacturing, capacitors, circuits, etc., can solve the problems of inability to solve the problems of surface distribution of aluminum foil, low purity of negative electrode foil, and reduced mechanical strength, and achieve uniform corrosion state and surface dust. Less, corrosion-enhancing effect
Inactive Publication Date: 2007-04-11
深圳市东阳光化成箔股份有限公司
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Problems solved by technology
[0003] In order to reduce the production cost, the purity of the light foil used to produce the negative electrode foil is low (aluminum content ≥ 97%), which contains a large amount of impurities such as copper, iron, silicon, etc., and the distribution of these impurities on the surface of the aluminum foil is very uneven, so The channels formed on the surface of the aluminum foil after corrosion are also very uneven, and the existing pretreatment methods cannot solve the distribution state of the surface of the aluminum foil. Therefore, with the prolongation of the etching time, small channels are prone to merge in areas rich in impurities For a large channel, surface erosion occurs, which not only loses the original electrostatic capacity, but also greatly reduces the mechanical strength
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[0010] The present invention will be further described below in conjunction with the examples. In the manufacture of the negative electrode foil of the electrolytic capacitor, the optical foil used is a 50 μm negative electrode optical foil produced in China with a purity of ≥97%. The production process of the negative electrode foil is: foil release→pretreatment→corrosion→cleaning→intermediate treatment→cleaning→post-treatment→drying→foil collection. The pretreatment temperature is 50°C, the time is 30 seconds, and the pretreatment solution used is 2% sodium hydroxide solution; the composition of the corrosion solution is: free acid 1.5±0.5N, total acid 5.5±0.5N, aluminum ion 4.2±0.7N, The chloride ion is 5.5±0.5N, the corrosion temperature is 98±3°C, and the time is 15-30 seconds; the intermediate treatment solution is 0.9N±0.1 nitric acid, the intermediate treatment temperature is 40±5°C, and the time is 60 seconds; the post-treatment liquid is For 0.5% ammonium dihydrogen ...
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Zinc series phosphorization liquid is utilized as treating liquid including concentration 2-30%(weight ratio) phosphoric acid solution, 0.1-5g / l zinc oxide solution, 0.005-0.5% hydrofluoric acid solution in preliminary treatment. Processing temperature of pre-processing liquid is 20-90 deg.C and time period is 20-200 sec. With oil, impurity and natural oxide film on face of aluminum foil being removed, the pre-processing procedure of the invention creates a layer of phosphorization film on face of aluminum foil so as to protect the face of aluminum foil. In next corrosion treatment procedure, corrosion in area rich in impurity is restrained, and corrosion in area containing lower impurity is strengthened. Thus, corrosion state on face of aluminum foil is evened so as to increase specific volume of aluminum foil.
Description
technical field [0001] The invention relates to a method for manufacturing negative electrode foil for electrolytic capacitors, in particular to a method for manufacturing negative electrode foil for electrolytic capacitors using a special pretreatment method. Background technique [0002] The negative electrode foil in electrolytic capacitors is usually made of aluminum foil with a thickness of 20-60 μm and a purity of more than 97% through corrosion and expansion. In order to improve the specific volume of aluminum foil, it is generally necessary to pre-treat the aluminum foil before corrosion, that is, to carry out various physical or chemical treatments. The purpose is to remove oil, impurities and natural oxide film on the surface of the aluminum foil, adjust the structure of the aluminum foil, and improve Its surface condition makes the surface uniformly activated to facilitate the formation of uniformly distributed pores during corrosion and increase the specific volu...
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IPC IPC(8): H01G9/055H01G13/00
Inventor 罗向军
Owner 深圳市东阳光化成箔股份有限公司