Metals Home Black coating products & services Compatible Substrates Metals 13 Al Aluminium 4 Be Beryllium Cu3Zn2 Brass 24 Cr Chromium 27 Co Cobalt 29 Cu Copper 24 Au Gold 26 Fe Iron MgO Magnesium Oxide 28 Ni Nickel 78 Pt Platinum 47 Ag Silver Stainless steel 22 Ti Titanium 74 W Tungsten