Nanocomposite coatings for threaded connections

F - Mech Eng,Light,Heat,Weapons – 16 – L

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F16L 58/10 (2006.01)

Patent

CA 2670680

Coating systems which provide corrosion resistance and, optionally, lubrication, for threaded connections are disclosed. The compositions comprise a first coating composition 200 comprising polymer matrices of polyimides or epoxies which are modified with small amounts of a fluorine containing polymer. Also present in the coating compositions are corrosion inhibiting agents and inorganic particles having a mean diameter of between approximately 10 nm and 10 µm. Solid lubricants, which may include at least one of PTFE, HDPE, Graphite, and MoS2, are optionally added to provide the first coating with a low coefficient of friction. The coating systems may further comprise a second coating composition 202, comprising a solid lubricant dispersed within an epoxy resin and a solvent. The first and second coating compositions 200, 202 are deposited on at least a portion of at least one of the pin and box members 100, 104 of the threaded connections.

La présente invention concerne des systèmes de revêtements qui fournissent une résistance à la corrosion et, éventuellement, une lubrification, pour les connexions filetées. Les compositions comprennent une première composition de revêtement 200 comprenant des matrices polymères de polyimides ou d'époxys qui sont modifiées avec de faibles quantités de polymère contenant du fluor. Les compositions de revêtement comprennent également des agents inhibant la corrosion et des particules inorganiques ayant un diamètre moyen d'entre approximativement 10 nm et 10 µm. Des lubrifiants solides, qui peuvent comprendre au moins un parmi le PTFE, le PEHD, le graphite, et le MoS2, sont éventuellement ajoutés afin de fournir le premier revêtement avec un faible coefficient de frottement. Les systèmes de revêtement peuvent en outre comprendre une seconde composition de revêtement 202, comprenant un lubrifiant solide dispersé à l'intérieur d'une résine époxy et d'un solvant. Les première et seconde compositions de revêtement 200, 202 sont déposées sur au moins une partie d'au moins un des éléments de la pointe et du corps 100, 104 des connexions filetées.

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