Wear-resistant coating and preparation method and application thereof

Abstract

The invention relates to a wear-resistant coating, and a preparation method and application thereof. The coating is prepared from the following raw materials in parts by mass: an organic solvent, 5 to25wt% of a film-forming resin, 1 to 25wt% of a lubricating filler, 0.1 to 2 wt% of a grinding material, 0.2 to 2 wt% of a coupling agent, 1 to 2 wt% of an auxiliary agent, 1 to 2 wt% of a dispersingagent and 1 to 2 wt% of a defoaming agent. According to the invention, a proper surface pretreatment technology is adopted; the coating possesses synergistic effects of the grinding effect of the grinding material on tiny burrs on the surface of threaded surfaces, the abrasion reduction, wear resistance, and lubricating performance of the inorganic lubricating filler at extreme pressure conditions, and the extremely low friction coefficient of polytetrafluoroethylene; tiny burrs and scratches on the surface of the threaded surface are automatically ground and repaired in the screwing process of upper shackles of the threaded connectors, it is guaranteed that the threaded connector is well lubricated in the more than 20 times of screwing and unscrewing processes, and thread gluing is avoided. Ground construction procedures are simplified, the construction efficiency is improved, the cost is reduced, the connection reliability is improved, no pollution is caused to the environment, and the use is not influenced by natural conditions of application areas.

Description

technical field [0001] The invention relates to the technical field of petroleum machinery, in particular to a wear-resistant coating and its preparation method and application. Background technique [0002] When the oil-casing joint is made up, the internal and external threads in contact with each other are not in ideal smooth contact, but have certain roughness and shape and size deviations. Under the action of contact pressure, the actual contact area is much lower than that of The theoretical contact area causes the pressure in the local area of ​​the contact surface to exceed the yield limit of the thread base material, resulting in plastic deformation, resulting in cold welding of the two tooth surfaces that are in contact with each other between the threads. When the two tooth surfaces continue to rotate relative to each other, the cold weld will be torn. Therefore, scars along the direction of rotation appear on the thread surface, and this damage failure process i...

AI Technical Summary

Problems solved by technology

However, the existing copper plating or phosphating treatment cannot meet the requirements of on-site oil pipes

For example, the threads of joints such as direct-connection tubing, pup joints, and drilling / completion tools made of chromium-containing corrosion-resistant steel, the ordinary phosphating process has poor wear resistance, and the brush-plated copper technology has a slow processing speed

Moreover, the chromium-containing material is soft, and it is prone to plastic deformation under the action of high contact pressure, resulting in cold welding of the friction pair. When the relative sliding continues, the cold welding spot is torn, and the thread surface is damaged. Require