METHOD OF PREPARATION OF THE SURFACE BEFORE DEPOSITION OF THE PLASMA COATINGS Russian patent published in 2007 - IPC C23C4/02 B23H9/00 

FIELD: chemical industry; other industries; deposition of coatings by the gas-thermal methods.

SUBSTANCE: the invention is pertaining to the field of deposition of coatings by the gas-thermal methods, in particular, to the plasma deposition. The invention presents the method of preparation of the surface before the plasma deposition of chromium carbonyl. The method includes realization of the electrospark doping in the carbonic gas medium with utilization of the electrode formed from the powder on the basis of chromium. The doping is conducted at the following modes: the specific duration of the doping is 2-3 minutes/cm², the discharge current - 0.6-0.9 A, the amplitude of the electrode vibrations is 60-70 microns, the frequency of the electrode vibrations is IOO Hz. The technical result of the invention is the increase of the cohesion strength of the gas-thermal coating with the substrate.

EFFECT: the invention ensures the increased cohesion strength of the gas-thermal coating with the substrate.

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