The decorating bar becomes provided with a chromium coating
for protection against corrosion and for optical reasons. The coating can get directly
deposited on the untreated workpiece surface or the workpiece becomes polished
first, to get a surface with high luster . The most common chromium coatings lies
between 0,5 and 5 µm . A very thin interlayer of copper is usually deposited
between the material and the chromium layer. This coating method is always advantageous,
when burnished surfaces, in connection with protection against corrosion, are standing
in the foreground. Basic material of this sample is 1.0718 (11SMnPb30) .