Pure aluminum cathode foil for capacitors and manufacturing method thereof
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A manufacturing method and cathode foil technology, applied in capacitors, electrolytic capacitors, circuits, etc., can solve problems such as uneven corrosion of cathode foils, achieve uniform corrosion morphology, reduce production and equipment costs, and low leakage current.
Active Publication Date: 2016-08-31
河南恒纳百美装饰材料有限公司
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[0003] In view of the above deficiencies, the purpose of the present invention is to provide a pure aluminum cathode foil for capacitors and its manufacturing method, which solves the problem of uneven corrosion of commonly used cathode foils, and obtains cathode foils with high specific capacitance under the premise of reducing costs
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Embodiment 1
[0033] A pure aluminum cathode foil for capacitors, the composition and mass percentage of which are: Si 0.04%, Fe 0.24%, Cu 0.19%, Ti 0.038%, and the balance is Al.
[0034] A manufacturing method comprising the steps of:
[0035] The first step, casting and rolling and slag removal process:
[0036] (1) Send the electrolytic aluminum liquid to the smelting furnace, add solid material (cold-rolled scrap), and adjust the mass percentage of each element in the melt to be: Si 0.04%, Fe 0.24%, Cu 0.19%, Ti 0.038%, The balance is Al, and the melt temperature is controlled within the range of 760°C;
[0037] (2) Use nitrogen gas to spray powder spraying refining agent HZ-PF with 0.3% of the melt mass into the melt, refine for 22 minutes, and then stand for 20 minutes to remove the scum on the surface of the molten aluminum, transfer it to a standing furnace, and control The temperature is at 745°C;
[0038] (3) Send the molten aluminum in the static furnace into the launder, add...
Embodiment 2
[0045] The difference from Example 1 is that in the second step (2), the recrystallization annealing process is adjusted to: 250°C / 1.5h, 250°C / 4h, 250°C / 8h, 400°C / 1.5h, 400°C / 4h, 400°C / 8h.
[0046] image 3It is the recrystallized grains of pure aluminum cathode foil blanks with different annealing processes. It can be seen that when the annealing temperature is 250°C, the recrystallized grains grow significantly with the prolongation of the annealing time; when the annealing temperature is 400°C, the recrystallized grains have no obvious growth trend.
[0047] Figure 4 The microstructures of pure aluminum cathode foil blanks with different annealing processes. Table 1 shows the statistics of the second phase particles of pure aluminum cathode foil blanks corresponding to each annealing process. It can be seen that the precipitation of the second phase of the blanks after annealing at 250 ° C and 400 ° C is significantly different. When holding for 2 hours, after recryst...
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Abstract
The invention belongs to the field of electrode foil for capacitors and particularly relates to pure aluminum cathode foil for the capacitors and a manufacturing method thereof. The pure aluminum cathode foil is composed of, in mass percentage, smaller than 0.1% of Si, 0.2-0.25% of Fe, 0.19-0.25% of Cu, 0.03-0.04% of Ti and the balance Al. The manufacturing method comprises the steps of 1, preparing casting-rolling blanks according to the components and the mass percent; and 2, carrying out the cold rolling and hot processing technology. The step 2 comprises the sub-steps of (1), cold-rolling the casting-rolling blanks in the step 1 to 3.8-4.2 mm in thickness, carrying out homogenizing annealing on the blanks at 500-550 DEG C for 8-12 hours and then air-cooling the blanks; (2), cold-rolling the blanks subjected to homogenizing annealing to 0.3-0.5 mm in thickness, carrying out recrystallization annealing on the blanks at 380-420 DEG C for 1.5-2.5 hours and then air-cooling the blanks; and (3), cold-rolling the blanks subjected to recrystallization annealing to the thickness required by the cathode foil. According to the pure aluminum cathode foil for the capacitors and the manufacturing method thereof, the problem that corrosion of common cathode foil is not uniform can be solved, and the cathode foil high in specific capacitance can be obtained.
Description
technical field [0001] The invention belongs to the field of electrode foils for capacitors, and in particular relates to a pure aluminum cathode foil for capacitors and a manufacturing method thereof. Background technique [0002] Aluminum electrolytic capacitors are one of the key components of electronic circuits, and their volume affects the development of miniaturization and lamination of electronic circuits. Pure aluminum substrates are often used as raw materials for negative electrode foils of aluminum electrolytic capacitors. Improving the corrosion performance of negative electrode foil raw materials means increasing the effective surface area of aluminum foil after corrosion, which can effectively reduce the volume of aluminum electrolytic capacitors. The smaller the crystal grains in the aluminum foil blank, the more the second phase particles, the more beneficial to improve the corrosion performance of the aluminum foil. The production of pure aluminum-based ...
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