Producing process for electrolysis capacitor high temperature resistant alloy aluminum cathode foil
A high-temperature-resistant alloy and electrolytic capacitor technology, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems of rising leakage current, destroying the surface structure of corroded foil, and reducing service life, so as to avoid the increase of leakage current and prolong the use Longevity, enhanced hydration resistance
Inactive Publication Date: 2009-05-06
DONGGUAN HEC CONDENSER CO LTD
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Problems solved by technology
The content of impurities such as Cu and Fe on the surface of the negative electrode foil produced by pure chemical corrosion process is relatively high, and Cu, Fe and Al form a primary battery in the electrolyte to cause self-corrosion, which destroys the original surface structure of the corroded foil. In the capacitor, it will cause the leakage current to rise and reduce its service life, especially under the high temperature condition of 100 ℃
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Embodiment
[0025] With the negative electrode foil prepared by the process of the present invention, its process is as follows:
[0026] The present invention uses the same electronic aluminum foil as the comparative example to be a hard light foil of 50 microns, the Al% (mass percentage content) is ≥ 98%, and the Cu% is 0.1-0.2%. The process steps are: pretreatment→water washing→chemical Corrosion→water washing→intermediate treatment 1→water washing→intermediate treatment 2→cleaning→intermediate treatment 3→water washing→stabilization treatment.
[0027] In percent by weight:
[0028] The pretreatment solution is 0.5% NaOH solution, treated at 50°C for 15 seconds; the corrosion solution is composed of 20% hydrochloric acid and 15% aluminum chloride solution, etched at 103°C for 15 seconds; the cleaning solution is a mixture of nitric acid and phosphoric acid , the concentration is 0.5N;
[0029] Intermediate treatment 1: the treatment solution is nitric acid solution, the concentratio...
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The invention belongs to a preparation technology of a high-temperature resistant alloy aluminum cathode foil for capacitors. The adopted technical scheme comprises: pretreatment, pure chemical etching, first mid-treatment, second mid-treatment, third mid-treatment, stabilization treatment and washing treatments among the steps. The invention adds the three-level mid-treatment, adopts sufficient cleaning and a multi-level film layer covering method to enhance the hydration resistance of the cathode foil and prevent the disadvantages brought by Cu, Fe and other impurities; the capacity of the cathode foil does not change after boiling water treatment of deionized water for ten hours, thereby the leakage current is prevented from increasing, and the capacity does not change especially under high temperature treatment for a long time, thereby the service life of the capacitors is prolonged.
Description
Technical field: [0001] The invention belongs to a process for preparing a high-temperature-resistant alloy aluminum negative electrode foil of an electrolytic capacitor. Background technique: [0002] At present, the negative electrode foil that has not been anodized in China cannot pass the 10-hour deionized water boiling water treatment; while the domestic negative electrode foil manufacturing technology all adopts pure chemical corrosion process, the original negative electrode foil manufacturing adopts pure chemical corrosion process The process is: pretreatment→water washing→chemical corrosion→water washing→cleaning→water washing→stabilization treatment; there are two main types of electronic aluminum foils used: Al-Cu series and Al-Mn series, and their common feature is that the aluminum foil contains impurities Cu % (mass percentage content) is 0.1-0.3%, Mn%, Fe%, Si% (mass percentage content) exceeds 0.1%, and the presence of impurities such as Cu and Fe can acceler...
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IPC IPC(8): H01G9/045H01G9/055C23F1/20
Inventor 曾森时
Owner DONGGUAN HEC CONDENSER CO LTD