Preparation method of 7000-series aluminum material
An aluminum and anodizing technology, applied in anodizing and other directions, can solve the problems of reducing the quality of finished wafers, easy corrosion of the cavity surface, color difference, etc., and achieve the effect of wide application and easy realization.
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Embodiment 1
[0022] A preparation method of 7000 series aluminum material, such as 7050 aluminum alloy, the Zn content of the near-surface area on the cross-section of the 7050 alloy is 6.62%, the Zn content of the central area is 6.30%, and the zinc element content of the near-surface area and the central area is different The value ΔZn=0.32%. The 7050 alloy undergoes semi-continuous casting→homogenization heat treatment→rolling→solution treatment→pre-stretching→aging treatment→anodizing treatment, wherein the solution treatment temperature is 500°C, the holding time is 1.5h, and the cooling rate is 200°C. ℃ / s; anodic oxidation treatment process parameters: dilute sulfuric acid with electrolyte concentration of 15%, temperature of 15℃, current density of 0.5A / dm 2 , the time is 30min.
[0023] The thickness of the oxide layer on the section of the sample was measured by an eddy current thickness gauge to be 2.9 μm. By naked eye observation, the overall color and luster of the sample cro...
Embodiment 2
[0025] Example 2 is based on Example 1, the solution treatment process parameters remain unchanged, and the anodic oxidation time is increased from 30 minutes to 60 minutes. The thickness of the oxide layer on the section of the sample was measured by an eddy current thickness gauge to be 5.1 μm. Observed by naked eyes, the overall color of the sample cross-section is uniform, slightly yellowish. The color difference measurement of the section takes the central area as the standard sample, the color difference ΔE1 of the area near the upper surface of the section is 0.45, and the color difference ΔE-1 of the area near the lower surface of the section is 0.43.
Embodiment 3
[0026] Embodiment 3 is on the basis of embodiment 1, solution treatment process parameter is constant, anodic oxidation current density is by 0.5A / dm 2 Increase to 2.0A / dm 2 . The thickness of the oxide layer on the section of the sample was measured by an eddy current thickness gauge to be 23.9 μm. By naked eye observation, the overall color and luster of the sample cross-section is uniform. The color difference measurement of the section takes the central area as the standard sample, the color difference ΔE1 of the area near the upper surface of the section is 0.89, and the color difference ΔE-1 of the area near the lower surface of the section is 0.86.
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