Oil and water marks on the surface of hot-rolled aluminum plate

Oil traces, which remain on the surface of the aluminum sheet after cold rolling, will form brown or red scars when annealed at high temperature, affecting the appearance.

Water traces, which remain on the surface of the quenched plate, show white or black traces, affecting the appearance.

The surface is not bright, and the surface of the aluminum sheet is dark and unsightly.

Bright bands, the surface of the aluminum plate produces a bright mark of varying widths due to uneven roughness.

Small black spots, irregular black spots on the surface of the aluminum plate will reduce the corrosion resistance and are not beautiful.