Surface treatment with manganese phosphating gives your items the following properties:
Technical use black chromium coating is typical optical equipment and the like, as anti- reflective surface. The surface of the black chromium mainly consist chromium oxide. Man kan også vælge at bruge sort krom til dekorative formål.
Black chromium is not glossy and shiny
Chromium is probably best known from shiny and chrome parts, such rims on cars etc. Therefore, for many perhaps it is hard to imagine black chromium.
Chromium in steel is generally used in order to make it stainless, and is used by the anodization of aluminum, wherein the surface of the work piece is actually being converted to the ruby.