&Nbsp;   in recent years, aluminum sheet, the surface treatment technology of aluminum composite panels and honeycomb panels, sunny great oxidation process technology development trends. For aluminum, Anodic oxidation of aluminium composite panels and honeycomb panels, be aware of Anodic oxidation film thickness uniformity and color uniformity and reproducibility. To ensure uniformity in Anodic oxidation film thickness and color uniformity and reproducibility, you must strictly control the chemical composition of aluminum anode oxidation production. 　　
1, strict control of casting production. Chemical composition control of ingots must be as small as possible, and chemical composition must be even. In addition, the melting process, casting and homogenizing treatment process must be strictly enforced. 　　
2 choose the appropriate fixture. Good conductive material must ensure that the loading fixture, usually of copper or copper alloy clamp. Have used specialized or generic tools and fixtures such as Anodic oxidation processing again when using, you must remove the oxide layer on the surface, to ensure a good contact. 　　
3 strictly controlled Anodic oxidation temperature. Anodic oxidation mechanism of film forming, Anodic oxidation at lower temperature, oxide film formed by a dense, small porosity, as anodizing temperature increases, oxide film becomes loose, progressively larger porosity, coating color with temperature rises gradually become darker. So anodizing temperature is an important factor in determining degree of oxide film on tight, but also important factor determining oxide film uniformity of color. 　　
4, strict control of anodizing current density. With increasing current density and gradually darken the color of the oxide film, thickness of the coating thickens and then thinned out, the reason is that the current density increases, increased membrane pore easy; current density decreases, film growth rate decreases, film density, so as current density increases and gradually darken the color of the oxide film. In the case of other things being equal, increasing current density, oxide film growth accelerates, reduces oxidation time, film chemical reduces dissolved, film tough, hardwearing. But current density does not rise too high, otherwise they will be due to Joule heating effects, increased thermal effect of film hole, a local temperature rise dramatically, dissolving the oxide film speed, speed reduction rather than film. That means higher current density, speed can increase film build within a certain range, but reaches a certain value, the speed reduction rather than film. Current density and color uniformity directly affects the size of oxide film.