Patent ID: 8128991

Claim:
A method of treating the surface of a mechanical part made of high-strength steel, the method seeking to confer on said part friction and lubrication properties that are needed for its use, wherein the method comprises the following successive steps: a) subjecting the part (P) to a primary finishing step organized to lower its surface roughness (Ra) to a value less than or equal to a first predetermined threshold (S 1 ); b) then subjecting the part (P) to surface cleaning by means of a degreasing solution; c) subjecting the part (P) as cleaned in this way to a tribo-finishing step organized firstly to further lower its surface roughness (Ra) to a value less than or equal to a second predetermined threshold (S 2 ) that is less than the first predetermined threshold (S 1 ), and secondly to increase its wettability by hydraulic fluids; and d) subjecting the part (P) to projection, at high speed and at ambient temperature, of tungsten bisulfide (WS 2 ) powder in the form of platelets (p) that break, thereby creating a dense and self-lubricating deposit on the surface of said part.