Plating liquid for electroplating tungsten-molybdenum-cobalt-iron alloy plating on surface of oil-pumping part

Abstract

A disclosed plating liquid for electroplating a tungsten-molybdenum-cobalt-iron alloy plating on the surface of an oil-pumping part comprises, 56-60 g/L of ferrous sulphate, 14-18 g/L of sodium tungstate, 6-10 g/L of sodium molybdate, 8-12 g/L of cobalt sulfate, 8-10 g/L of sodium hypophosphite, 13-17 g/L of boric acid, 20-24 g/L of ammonium sulfate, 30-34 g/L of tartaric acid, 11-15 g/L of Potassium pyrophosphate, 10-14 g/L of ascorbic acid, 1-3 ml/L of formaldehyde, 2-4 ml/L of dimehtyl hexynol, 2-4 mg/L of thiourea, and the balance water.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a plating solution for electroplating a tungsten-molybdenum-cobalt-iron alloy coating on the surface of an oil pumping part. Background technique [0002] Sucker rods and tubing are used for oil recovery in oil fields. There are two world-class problems encountered in mines: corrosion and wear. Well fluids often contain CO 2 , H 2 Corrosive media such as S and brine can cause corrosion fatigue fracture of sucker rods, corrosion damage of oil well pumps and screw pumps, corrosion and perforation of oil pipes, and seriously affect crude oil production. Some pumping wells of Dongxin Oil Production Plant in Shengli Oilfield broke due to corrosion of couplings (45 steel, quenched and tempered) after three months of operation. In some pumping wells in Zhongyuan Oilfield, the sucker rods suffered from corrosion fatigue fracture after three months of operation. In deviated we...

AI Technical Summary

Problems solved by technology

For more than 100 years, researchers of oil production machinery have carried out a lot of research work on corrosion and wear problems. On the sucker rod, such as using corrosion-resistant alloys: for example, K-grade sucker rods use 20Ni2Mo, which contains Ni, Cr, Mo Corrosion-resistant alloys are more expensive; use anti-corrosion coatings: including metal coatings (such as hot-dipped aluminum, chrome plating, spraying nickel-based alloys) and non-metallic coatings (such as epoxy resin coatings), existing problems: coating peeling off , this kind of sucker rod cannot be used in inclined wells; use non-metal: glass fiber reinforced plastic sucker rod, carbon fiber composite material continuous sucker rod, these two kinds of sucker rods are relatively expensive, and have poor compression and wear resistance; use corrosion inhibition Agent: relatively expensive, and the anti-corrosion effect is not ideal; on the oil suction pipe, nickel-phosphorus composite inner coating technology is used; bimetallic oil pipe; nitriding; FRP-lined oil pipe

Although some results have been achieved, the problem has not been solved