A kind of aluminum alloy and preparation method thereof
An aluminum alloy and hard anodic oxidation technology, applied in the field of aluminum alloy, can solve the problems of not having high hardness, high wear resistance and high corrosion resistance, and aluminum alloy cannot meet the requirements, and achieve strong wear resistance and corrosion resistance , high hardness, dense and uniform film layer
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[0023] At the same time, the present invention also provides the preparation method of the above-mentioned aluminum alloy, and the steps include: subjecting the aluminum alloy precursor to be treated to S1, alkali washing; S2, pickling; S3, acid erosion; S4, hard anodic oxidation; S5 , hot water washing; S6, passivation; S7, sealing the aluminum alloy, the electrolyte components used in the step S4 hard anodizing include phytic acid, oxalic acid, citric acid, boric acid and lactic acid.
[0024] In the present invention, the aluminum alloy can be well formed into a film by first alkali washing, then pickling, finally acid erosion, and then hard anodic oxidation and passivation, and the prepared aluminum alloy is stronger in corrosion resistance and wear resistance , the formed hard anodic oxide film is uniform and continuous, without partial non-film formation, no shedding, no partial powdering, fading, etc., and the color is uniform and stable. After pre-soaking in nitric acid...
Embodiment 1
[0037] Dip the aluminum alloy precursor to be treated into an alkaline cleaning solution, which includes 30g / L sodium carbonate, 20g / L sodium phosphate and 10g / L sodium hydroxide, at a temperature of 75°C, and the cleaning time is 30 seconds , then cleaned with deionized water, then immersed in a mixed acid solution containing 50g / L sulfuric acid and 25g / L chromic anhydride for 20 seconds, then cleaned with deionized water, and then immersed in acid etching solution for 10 seconds, the acid The etching solution is a mixed acid of 40wt% nitric acid and 10ml / L hydrofluoric acid, then cleaned with normal temperature deionized water, and then immersed in a hard anodizing tank, the electrolyte in the anodizing tank includes phytic acid 130-135g / L, Oxalic acid 40g / L, citric acid 20g / L, boric acid 20g / L, lactic acid 10g / L, adjust the current to 2.5A / dm2, the anode voltage starts at 40V, and gradually adjusts to 110V, the temperature of the oxidizing solution is 15°C, and the time is 6...
Embodiment 2
[0040] Dip the aluminum alloy precursor to be treated into an alkaline cleaning solution, which includes 30g / L sodium carbonate, 20g / L sodium phosphate and 30g / L sodium hydroxide, at a temperature of 75°C, and the cleaning time is 40 seconds , then cleaned with deionized water, then immersed in a mixed acid solution containing 50g / L sulfuric acid and 25g / L chromic anhydride for 10 seconds, then cleaned with deionized water, and then immersed in acid etching solution for 30 seconds, the acid The etching solution is a mixed acid of 40wt% nitric acid and 10ml / L hydrofluoric acid, then cleaned with normal temperature deionized water, and then immersed in an anodic oxidation tank. The electrolyte in the anodic oxidation tank includes phytic acid 130-135g / L, oxalic acid 50g / L, citric acid 25g / L, boric acid 25g / L, lactic acid 15g / L, adjust the current to 3.0A / dm2, the anode voltage starts at 40V, and gradually adjusts to 120V, the temperature of the oxidizing solution is 25°C, and th...
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Abstract
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