A self-lubricating wear-resistant plunger surface and its preparation method

Abstract

The invention provides a self-lubrication abrasion-proof plunger surface and a preparation method. The method comprises the step of melting and covering alloy powder on the plunger surface to form an alloy cladding, wherein the thickness of the alloy cladding is 0.3-2.5 mm, the hardness of the alloy cladding is 45-65HRC, and the surface roughness of the alloy cladding is Ra 0.1-0.6 micron; the alloy powder comprises the following chemical components in mass percentage: 0.2%-7.5% of carbon, 13%-18% of chromium, 2%-14% of nickel, 1%-2% of manganese, 1%-5% of molybdenum, 1.5%-2.5% of boron, 0.5%-1.5% of silicon, 2%-5% of rare earth oxide, 5%-45% of tungsten carbide and the balance of iron. According to the preparation method disclosed by the invention, after the alloy powder is melted and coated on the carbon steel surface of a base material through a laser cladding technology, crude processing is performed through turning, then surface finishing is performed according to an ultrasonic calendering technology, and the plunger surface with self-lubrication, abrasion resistance and corrosion resistance is obtained. The plunger surface has the characteristics of high hardness and abrasion resistance, and favorable corrosion resistance and self-lubrication, and the manufacturing technology is non-pollution to environment.

Description

technical field [0001] The invention relates to a plunger-type plunger surface, in particular to a self-lubricating wear-resistant plunger surface and a preparation method thereof. Background technique [0002] The plunger is one of the key parts of the plunger pump. Most of the water used by oilfield water injection pumps is untreated sewage after production, which contains crude oil, solid suspended particles, inorganic salt ions, bacteria, etc., and the pH value of the injected water is relatively high. During the operation of the plunger pump, the plunger is always in contact with the liquid and rubs against the packing. Because the plunger pump works under the severe working conditions of the alternating pressure of the liquid flow, the erosion of the liquid flow, the frictional temperature rise, and the alternating mechanical stress, the surface of the plunger is worn out in the form of strain, corrosion, and peeling. , leading to serious leakage, low pump efficiency...

AI Technical Summary

Problems solved by technology

The electrochrome plating process seriously pollutes the environment; electrochrome plating is easy to cause bubbling, cracking, and falling off in the harsh environment where the oilfield water injection pump is located