Please indicate the material of the part to be coated

Roughening the surface with corundum radiation is a prerequisite for many coating materials to ensure good adhesion of the material to the substrate. When blasting, corundum particles of different grain size strike the substrate surface at high pressure, thus roughening the surface. There is a slight removal of material and due to the high mechanical energy and heating on impact sensitive parts can be deformed.

What purpose should be fulfilled by the coating?

Should an already existing coating be renewed?