Aluminum material with excellent surface quality and preparation method thereof
A surface quality and aluminum technology, applied in the field of aluminum alloys, can solve problems such as restricting the promotion of aluminum materials and different colors, and achieve the effects of wide application range, easy implementation and excellent appearance uniformity.
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Embodiment 1
[0033] Preparation of aluminum alloy sheet:
[0034] (1) Adopt the direct cooling method to cast and produce the aluminum alloy ingot with chemical cost as shown in Table 1, after carrying out soaking treatment, hot-rolled into the hot-rolled plate of 7.0mm thickness;
[0035] (2) After cold rolling and 340°C recrystallization annealing, the aluminum material with a thickness of 2.0 mm is cut into 200 mm (length) × 150 mm (width) plates for later use;
[0036] (3) Immerse the plate in 15% NaOH aqueous solution to eliminate the original oxide film on the surface of the aluminum; after that, clean the surface of the aluminum with 20% nitric acid solution;
[0037] (4) Polish the grinding wheel to a Ra of 0.3μm roughness aluminum at 20°C in a sulfuric acid solution with a concentration of 18% at 1.4A / dm 2 The current density constant current anodizing treatment for 30min, the aluminum material whose surface is covered with an oxide film with a thickness of 10μm is obtained.
Embodiment 2
[0039] Preparation of aluminum alloy sheet:
[0040] (1) Adopt the direct cooling method to cast and produce the aluminum alloy ingot whose chemical cost is shown in Table 1, after carrying out soaking treatment, hot-rolled into the thick hot-rolled sheet of 4.0mm;
[0041] (2) After cold rolling and 300°C recrystallization annealing, the aluminum material with a thickness of 0.5 mm is cut into 200 mm (length) × 150 mm (width) plates for later use;
[0042] (3) Immerse the plate in 10% NaOH aqueous solution to eliminate the original oxide film on the surface of the aluminum; after that, clean the surface of the aluminum with 10% nitric acid solution;
[0043] (4) Polishing the grinding wheel to Ra is 0.35 μm roughness aluminum material in the sulfuric acid solution that is 15% concentration under 10 ℃, with 1.2A / dm The current density constant current anodizing treatment 40min, obtains that the surface is covered with a thickness of Aluminum material with 5μm oxide film.
Embodiment 3
[0045] Preparation of aluminum alloy sheet:
[0046] (1) Adopt the direct cooling method to cast and produce the aluminum alloy ingot with chemical cost as shown in Table 1, after carrying out soaking treatment, hot-rolled into the hot-rolled plate of 8.0mm thickness;
[0047] (2) After cold rolling and 360°C recrystallization annealing, the aluminum material with a thickness of 3.0 mm is cut into 200 mm (length) × 150 mm (width) plates for later use;
[0048] (3) Immerse the plate in 20% NaOH aqueous solution to eliminate the original oxide film on the surface of the aluminum; after that, clean the surface of the aluminum with 30% nitric acid solution;
[0049] (4) Polishing the grinding wheel to Ra is that the aluminum material with a roughness of 0.4 μm is in a sulfuric acid solution with a concentration of 25% at 40° C., with a current density of 1.8 A / dm2 constant current anodizing treatment for 20 minutes, and the surface is covered with a thickness of Aluminum material...
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Abstract
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