Aluminum alloy surface scratches and adhesion

Dislocation of the aluminum coating layer. During hot rolling, the aluminum coating plate deviates or swings horizontally. A relatively neat dark band will be formed along the edge of the surface of the aluminum plate After heat treatment, the dark band will show a yellow-brown strip mark, which greatly affects the corrosion resistance of the aluminum plate.

Bumping. The surface or end face of the aluminum plate will form uneven, single or multiple pits after being hit by other objects. This pit will be more destructive to the surface.

Adhesion. Because the pressure between the aluminum plates is too high, it will cause a large area of ????the aluminum plate surface, with a certain depth, and point-shaped, sheet-shaped or strip-shaped marks at the same position. These marks destroy the surface oxide film or aluminum coating of the aluminum plate, which can reduce the corrosion resistance of the aluminum plate.