After oxidation, a layer of oxide film will form on the surface of 7075 alloy aluminum plate, which has many benefits. However, during processing, one is afraid of poor adhesion of the oxide film. How to prevent poor adhesion of the oxide film on 7075 alloy aluminum plate?
 

1. Hot water flushing. Hot water flushing is targeted at aging film layers, but the temperature and time of the water must be strictly controlled. If the water temperature is too high, the film layer will become thinner and the color will become lighter.

2. Drying. Drying is best done naturally by hanging the workpiece diagonally on a rack to allow the water flow on the surface of the 7075 aluminum plate to flow downstream. Then, the water is sucked dry, allowing the color of the film layer to remain unaffected and appear more natural.

3. Repair of defective units. The component should be dried with a defective conductive oxide film, which is picked out before the aging step. After drying, it is difficult to peel off the film after aging and may affect the surface roughness of 7075 aluminum. The unqualified 7075 aluminum plate workpiece can be clamped on the fixture, and then an anodic surface treatment can be conducted according to the anodic oxidation technology method of 7075 aluminum plate in sulfuric acid standard solution for 2-3 minutes. After the film layer is soft and detached, it can be slightly cleaned with alkaline solution and exposed to nitric acid before redesigning and conducting anodization analysis.
 

Fengleiyi Aluminum specializes in producing 7075 alloy aluminum plates. If you need 7075 alloy aluminum plates, you can consult us.