How to reduce the loss of industrial aluminum profile after surface oxidation? The oxidation operation for aluminum profile is to enhance its anti-corrosion characteristics. However, due to improper operation, the color of oxide film may be uneven. The area of industrial aluminum profile workpiece is too large, and the swing in the groove is too large during operation. The contact, renewal and exchange between the edge and center and the solution will be different, resulting in inconsistent color of oxide film. Prevention method: when the aluminum profile is oxidized, the swing range of the workpiece should be small, and static treatment is also OK, but when the solution temperature is too low, it is easy to appear map like spots, which is unnatural. During the processing of aluminum clad profiles, some aluminum clad layers are damaged and cut off. The outer aluminum clad is high-quality aluminum, and the inner aluminum clad is miscellaneous aluminum. The two kinds of aluminum have great differences, so spots will appear after oxidation. Operation of oxidation process: the alkali corrosion treatment of the workpiece is not complete, and the original oxide film and dirt at some parts are not removed completely; After alkali etching, there is no immediate light treatment, and the surface of the workpiece is still alkaline; The workpiece has been in contact with foreign matters during transmission.