Aluminum alloy electric heater anode oxide film and preparation method thereof
A technology of anodic oxidation film and electric heater, which is applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc. It can solve the problems of large pore size, poor corrosion resistance and high porosity of anodic oxidation film, and achieve uniform performance of the film layer Guaranteed, high corrosion resistance, low porosity effect
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Embodiment 1
[0036] In this example, the aluminum alloy sample (that is, the aluminum alloy workpiece) is made of 3003 aluminum alloy, and its chemical composition and content (wt%) are: Mn 1.0-1.5, Fe 0.7, Si 0.6, Cu 0.05-0.2, Zn 0.1 balance for aluminum. The preparation of composite acid anodic oxidation film is specifically completed by the following steps:
[0037] (1) Mechanical grinding: use 180#, 320#, 400# sandpaper to polish the surface of the workpiece respectively.
[0038] (2) Alkali cleaning: put the aluminum alloy in a solution containing 30g / L Na 3 o 4 , 25g / L Na 2 CO 3 , 2g / L OP-10 solution container at 40 ° C for 3 minutes, the workpiece after alkali washing is first washed with hot water at 90 ~ 95 ° C, and then washed with cold water to clean.
[0039] (3) Pickling and activation: Put the workpiece after alkali washing and cleaning into the solution containing 30% HNO 3 Pickling and activation at room temperature for 60s, and the workpiece after pickling was cleane...
Embodiment 2
[0047] The operation method is the same as that in Example 1, except that in step (5) during the anodic oxidation process, the electrolyte composition is: 70g / L sulfosalicylic acid, 30g / L boric acid, 25g / L oxalic acid, 2mL / L sulfuric acid, 150g / L Aluminum sulfate octadecahydrate; current density 3.5A / dm 2 .
Embodiment 3
[0049] The operation method is the same as that in Example 1, except that in step (5) during the anodic oxidation process, the electrolyte composition is: 50g / L sulfosalicylic acid, 20g / L boric acid, 15g / L oxalic acid, 2mL / L sulfuric acid, 150g / L Aluminum sulfate octadecahydrate; current density 2.5A / dm 2 .
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