Passivation creates a chemically passive, wafer-thin oxide layer on the workpiece. The aim is to increase the corrosion resistance - without any significant layer build-up and without affecting the dimensional accuracy. This is particularly useful for aluminum because not every alloy forms an evenly protective natural oxide layer. Bright protection is the functional solution for components that need to be transported, stored or secured in intermediate processes - with a protective effect but without any visible change to the surface.