A kind of aluminum material without pit point defects on the surface and preparation method thereof
A point defect and aluminum technology is applied in the field of aluminum without pit point defects on the surface and its preparation, which can solve the problems of restricting the application of anodized aluminum, and achieve the effect of excellent uniformity of appearance and easy realization.
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Embodiment 1
[0035] (1) Preparation of cold-rolled aluminum:
[0036] The aluminum alloy ingots whose chemical costs are shown in Table 1 are produced by direct cooling method. After soaking at 520°C for 10 hours, hot-rolled 6.0mm-thick hot-rolled plates at 320°C are cold-rolled into 2.5mm-thick ones. Aluminum;
[0037] (2) Purified cold-rolled aluminum:
[0038] Immerse the obtained aluminum material in 15% NaOH aqueous solution to eliminate the original oxide film on the surface of the aluminum material, and then clean the aluminum material surface with 20% nitric acid solution;
[0039] (3) Anodizing treatment:
[0040] Put the aluminum material at 1.4A / dm in 18% sulfuric acid solution at 20°C 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.
[0041] The surface diagram of this example is shown in figure 1 , the scanning electron micrograph of this example is...
Embodiment 2
[0043] (1) Preparation of cold-rolled aluminum:
[0044] The aluminum alloy ingots whose chemical costs are shown in Table 1 are cast by direct cooling method. After soaking at 490°C for 20 hours, hot-rolled 4.0mm-thick hot-rolled plates at 400°C are cold-rolled to 1.6mm-thickness. Aluminum;
[0045] (2) Purified cold-rolled aluminum:
[0046] Immerse the obtained aluminum material in 10% NaOH aqueous solution to eliminate the original oxide film on the surface of the aluminum material, and then clean the surface of the aluminum material with 10% nitric acid solution;
[0047] (3) Anodizing treatment:
[0048] The aluminum material was anodized with a current density of 1.2A / dm2 in a 15% sulfuric acid solution at 10°C for 40 minutes to obtain an aluminum material whose surface was covered with an oxide film with a thickness of 5 μm.
Embodiment 3
[0050] (1) Preparation of cold-rolled aluminum:
[0051] Cast aluminum alloy ingots with the chemical cost shown in Table 1 by direct cooling method. After soaking at 480°C for 20 hours, hot-rolled 8.0mm-thick hot-rolled plates at 360°C and cold-rolled 3.0mm-thickness Aluminum;
[0052] (2) Purified cold-rolled aluminum:
[0053] Immerse the obtained aluminum material in 20% NaOH aqueous solution to eliminate the original oxide film on the surface of the aluminum material, and then clean the surface of the aluminum material with 30% nitric acid solution;
[0054] (3) Anodizing treatment:
[0055] The aluminum material is anodized with a current density of 1.8A / dm2 in a 25% sulfuric acid solution at 40°C for 20 minutes to obtain an aluminum material whose surface is covered with an oxide film with a thickness of 30 μm.
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Abstract
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