Production method of 3003-brand cathode aluminum foil

Abstract

The invention relates to a production method of 3003-brand cathode aluminum foil, which includes the following steps: a. raw materials are refined and rolled into a blank with the thickness of 6.5 mm to 8.5 mm; b. the blank obtained in step a is rolled into the blank with the thickness of 3.5 mm to 4.3 mm in a cooling mode to be uniformly annealed; c. the uniformly-annealed blank is rolled into the blank with the thickness of 0.3 mm to 0.5 mm in a cooling mode to be recrystallized and annealed; and d. the recrystallized-and-annealed blank is rolled into the 3003-brand cathode aluminum foil with the required thickness. The method of the invention enables the cost to be lower and the product quality to be better, the specific capacitance of the product is increased to be higher than 530 microfarads / cm<2>, and the highest specific capacitance can be 560 microfarads / cm<2>. The invention greatly improves the product competitive strength, reduces the disparity with abroad products, and makes a contribution for the trade progress.

Description

technical field [0001] The invention belongs to the field of aluminum alloy material manufacturing, and in particular relates to a method for manufacturing a 3003 brand cathode aluminum foil. Background technique [0002] With the rapid development of electronic technology, the assembly density and integration of electronic machines are increasing. As a key, non-integrable discrete component, electrolytic capacitors are moving towards small size, large capacity, low cost, high frequency and low impedance. direction development. Aluminum electrolytic capacitors are widely used due to their excellent performance, low price, easy processing, and convenient use. Because the 3003 aluminum alloy material has the characteristics of good machining performance, corrosion resistance, heat dissipation performance, anti-electromagnetic interference performance, low density and excellent mechanical properties, it has been recognized by the market as the cathode aluminum foil of aluminum...

AI Technical Summary

Problems solved by technology

[0009] The grain size of the 3003 grade cathode aluminum foil has a great influence on corrosion. The 3003 series aluminum alloy contains Mn element, and the degree of supersaturation of the solute element in the solid solution of the cast-rolled plate is greatly improved. The alloy has a strong supercooling ability. During rapid cooling, the concentration distribution of Mn is not uniform, resulting in large intragranular segregation, resulting in serious growth of recrystallized grains.

[0010] At present, there are still some defects in the production of cathode aluminum foil. The existing method is to directly perform recrystallization annealing after casting and rolling, but the grains of the product after annealing are coarse, which is easy to cause delamination corrosion, resulting in a decrease in specific volume, which directly affects the quality of the product.

Moreover, the existing method needs to cast the electrolytic aluminum melt into aluminum ingots and then remelt them before casting and rolling. The process is cumbersome, and it causes waste of resources, high production costs, and does not conform to the sustainable development strategy.

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