Aluminium Foil 8079 adopts hot rolling method and a combined annealing process. The combined annealing process includes homogenization annealing process, intermediate annealing process and finished annealing process. Using this method to produce double zero aluminum foil effectively reduces the number of pinholes and makes double zero aluminum foil. Aluminium foil 8079 has higher strength and elongation. In order to solve the above technical problems, the present invention provides a double-zero aluminum foil. The composition and weight percentage of the double-zero aluminum foil are: Fe1-1.35%, Si0.1-0.12%, Zr0.02-0.04%, Ti0.010-0.035% , the rest are Al, and the total content of other impurities is ≤0.02%. A production method of double zero alu foil, comprising the following steps:
(1) Ingredients: ingredients according to the composition and weight percentage of the Double Zero Aluminum Foil;
(2) Smelting: add the prepared materials into the smelting furnace for smelting, so that the hydrogen content of the melt is less than or equal to 0.12ml/100g;
(3) Refining: let the molten aluminum after smelting stand, and then put into refining agent for refining, adjust the nitrogen pressure during refining to ensure that the height of the molten aluminum blown by nitrogen does not exceed 10cm, and remove the slag after 5 minutes of refining;
(4) On-line degassing: Pour high-purity nitrogen into the on-line SNIF degassing refining system to degas the molten aluminum to ensure that the nitrogen purity is greater than or equal to 99.995%, and the nitrogen pressure is set to 0.3MPa. The hydrogen content is less than or equal to 0.12ml/100g; (5) Casting: cast the degassed aluminum liquid at 700℃ into a large-sized flat ingot;
(6) Two-stage homogenization annealing: heat the cast flat ingot to 530°C, keep the temperature for 5-8 hours, continue to heat it to 620°C, keep the temperature for 4-6 hours, and conduct homogenization annealing;
(7) Hot rolling: Repeated hot rolling of the flat ingot, and intermediate annealing operation for 4 to 8 hours at 380 to 450 °C to form a 6.5mm billet;
(8) Cold rolling: the 6.5mm billet is cold-rolled to 2.75mm through multiple passes; annealed at 380-450 ℃ for 4-8 hours, and then cold-rolled to 0.52mm through two passes after cooling; then at 380-450 ℃ annealing treatment for 4-8h, after cooling, it is cold-rolled to 0.04mm by multiple passes;
(9) 8079 aluminum foil rolling: anneal the above-mentioned 0.04mm foil at 380°C for 4h, the foil is rolled to 0.015mm, and then double rolled to 0.005mm; (10) Finished annealing: the obtained 0.005mm foil is annealed at 230° Annealed at C to obtain ultra-thin double-zero aluminum foil 8079.
In the production process of aluminium foil 8079, there are many processes such as rolling, finishing, annealing, and packaging. The production process is interlinked. Therefore, when purchasing aluminum foil, we should not only pay attention to the quality of 8079 aluminum foil, but also understand the production strength of aluminum foil manufacturers. In the packaging industry, aluminum foil is also showing more and more unique and excellent performance, forming a new market growth point for its consumption in the packaging industry.
