ELECTROLYTE FOR DEPOSITION OF BLACK CHROMIUM COATING Russian patent published in 1997 - IPC

FIELD: electrolytic processes; protective coatings. SUBSTANCE: invention relates to applying black chromium coatings on blades, pistols, tommy guns, and other camouflage landing weapon, and may also be applied for parts of cinematographic and photographic apparatuses, medical tools, cutlery, and other protective-ornamental parts of consume goods. Electrolyte contains (in g/l): chromium trioxide, 150-500; potassium ferrocyanide, 4-10; sulfuric acid, 0.02-0.5; potassium fluorosilicate, 0.1-0.5; and additionally 0.2-1.0 g/l of remote- synthesis carbon. EFFECT: essentially increased wear resistance of coating with simultaneously preserving deep black chrome. 2 cl, 1 tbl