Causes of lotion mark and oil mark on the surface of aluminum plate

Emulsion marks refer to

The emulsion on the aluminum plate was not blown clean during hot rolling;

The temperature was too high during hot rolling, and the emulsion sintered, resulting in emulsion marks;

The emulsion marks on the aluminum plate are also due to the high viscosity of the emulsion, which sticks to the surface of the aluminum plate.

Reduction marks are:

If the aluminum plate is not cleaned after quenching, there will be reduction marks on the surface.

Oil marks refer to

Some lubricating oil remains on the surface of the aluminum plate, which causes oil marks on the surface of the aluminum plate after annealing;

Improper annealing process will produce oil marks.