Process for surface treatment of a high-strength steel...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 24/04 (2006.01) C23F 4/00 (2006.01) C23G 1/00 (2006.01) F16J 1/01 (2006.01) F16J 1/02 (2006.01)

Patent

CA 2668502

The invention relates to 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. In accordance with the invention, 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 (S1); 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 (S2) that is less than the first predetermined threshold (S1), 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 (WS2) powder in the form of platelets (p) that break, thereby creating a dense and self-lubricating deposit on the surface of said part.

L'invention concerne un procédé de traitement de surface d'une pièce mécanique en acier à haute résistance, visant à conférer à ladite pièce des propriétés en frottement et en lubrification nécessaires à son utilisation. Conformément à l'invention, le procédé comporte les étapes successives suivantes : a) on soumet la pièce (P) à une étape de finition primaire organisée pour abaisser sa rugosité en surface (Ra) à un premier seuil prédéterminé (S1) ; b) on soumet ensuite la pièce (P) à un nettoyage de surface au moyen d'une solution de dégraissage ; c) on soumet la pièce (P) ainsi nettoyée à une étape de tribofinition organisée pour d'une part abaisser encore sa rugosité en surface (Ra) à un deuxième seuil prédéterminé (S2) qui est inférieur au premier seuil prédéterminé (S1), et d'autre part augmenter sa mouillabilité aux fluides hydrauliques ; et d) on soumet la pièce (P) à une projection, à haute vitesse et à température ambiante, de poudre de bisulfure de tungstène (WS2)se présentant sous la forme de platelets (p) qui se brisent ainsi en créant en surface de ladite pièce un dépôt dense et autolubrifiant.

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