METHOD OF DEPOSITING OF A CHROMIUM COATING ON STEEL DETAILS Russian patent published in 2006 - IPC C23C28/02 

FIELD: mechanical engineering; methods of depositing of the chromium coatings on steel details.

SUBSTANCE: the invention is pertaining to the field of mechanical engineering, in particular, to the method of depositing of the chromium coating on the steel details and may be used for restoration and hardening of surfaces of the friction components of machines. The method includes an electrolytic deposition on a substrate of a chromium coating out of chromium-containing solutions at presence of a catalytic agent. Then conduct an anodic etching in the same electrolyte keeping to the following modes: a current density of 40-50 A/dc², the temperature of the electrolyte - 50-65°C. After the anodic etching they exercise deposition of an additional layer of the chromium coating from a gas phase of chromium hexacarbonyl by a thermal dissociation. In the particular cases of the invention realization the depth of the galvanic chromium layer makes 5-15 microns, and the increase of the coating thickness up to a required value is gained with the help of a thermal dissociation of the chromium hexacarbonyl vapors from the gaseous medium. The technical result of the invention is an increased adhesive strength of the coating with the substrate and an increased productivity of the process.

EFFECT: the invention ensures an increased adhesive strength of the coating with the substrate and a raise of the process productivity.

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