A mirror-like anodized aluminum alloy rolling plate and its preparation method
An anodizing and aluminum alloy technology, applied in the field of alloys, can solve the problems of pitting on the surface of the oxide film, restricting the application of high-end industrial fields, etc., and achieve the effect of overcoming pitting defects, excellent uniformity of appearance, and easy realization.
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Embodiment 1
[0022] (1) Cast aluminum alloy slabs by direct cooling method, after homogenization heat treatment at 480°C for 8 hours, hot rolling to 6.5mm, hot final rolling temperature at 280°C, cold rolling to 1.6mm, annealing at 200°C for 2 hours;
[0023] (2) Mechanically grind and polish the aluminum alloy plate to a surface roughness Ra≤0.05μm;
[0024] (3) Put the aluminum material at 1.4A / dm in a mixed solution of oxalic acid and sulfuric acid (8:2, v / v) at 20°C 2 The current density constant current anodizing treatment for 50min, then the anodized aluminum material was dyed for 2min, and then sealed with hot water for 2min, to obtain an aluminum material with a thickness of 10μm oxide film on the surface.
[0025] The metallographic pictures, grain morphology and texture distribution diagrams on the anodized surface of the gained aluminum material are as follows: figure 1 .
Embodiment 2
[0027] (1) Cast aluminum alloy flat ingots by direct cooling method, after homogenization heat treatment at 480°C for 8 hours, hot rolling to 8.0mm, hot final rolling temperature at 260°C, cold rolling to 2.0mm, annealing at 200°C for 2 hours;
[0028] (2) Mechanically grind and polish the aluminum alloy plate to the mirror surface to reduce the surface roughness Ra≤0.05μm;
[0029] (3) Put the aluminum material at 1.4A / dm in a mixed solution of oxalic acid and sulfuric acid (8:2, v / v) at 20°C 2 The current density constant current anodizing treatment for 50min, then the anodized aluminum material was dyed for 3min, and then sealed with hot water for 3min to obtain an aluminum material with a thickness of 11μm oxide film on the surface.
[0030] The metallographic pictures, grain morphology and texture distribution diagrams on the anodized surface of the gained aluminum material are as follows: figure 2 .
Embodiment 3
[0032] (1) Cast aluminum alloy flat ingots by direct cooling method, after homogenization heat treatment at 480°C for 8 hours, hot rolling to 8.0mm, hot final rolling temperature at 240°C, cold rolling to 2.0mm, annealing at 200°C for 2 hours;
[0033] (2) Mechanically grind and polish the aluminum alloy plate to a surface roughness Ra≤0.05μm;
[0034] (3) Put the aluminum material in a mixed solution of oxalic acid and sulfuric acid (8:2, v / v) at 18°C at 1.4A / dm 2 The current density constant current anodizing treatment for 60min, then the anodized aluminum material was dyed for 1min, and then sealed with hot water for 3min to obtain an aluminum material with a thickness of 12μm oxide film on the surface.
[0035] The metallographic pictures, grain morphology and texture distribution diagrams on the anodized surface of the gained aluminum material are as follows: image 3 .
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Abstract
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