Preparation method of plating solution for electroplating tungsten-molybdenum-nickel alloy coating on surface of petroleum-pumping component

Abstract

The invention discloses a preparation method of a plating solution for electroplating a tungsten-molybdenum-nickel alloy coating on a surface of a petroleum-pumping component. The preparation method comprises the steps of measuring half of water; heating the water to a temperature of 55-65 DEG C; adding 34-38 g / L of boric acid, 30-36 g / L of sodium sulfate and 20-24 g / L of ammonium sulfate; stirring to dissolve the above materials; adding 30-34 g / L of tartaric acid, 11-15 g / L of potassium pyrophosphate and 10-14 g / L of ascorbic acid; stirring for 3-5 minutes; adding 80-84 g / L of sodium tungstate, 6-10 g / L of sodium molybdate and 14-18 g / L of nickel sulfate; stirring for 10-20 minutes; and finally adding 1-3 ml / L of formaldehyde, 2-4 ml / L of dimethyl hexynol and the residual water; stirring uniformly; and regulating a pH value to 8.0-9.0 with ammonia water.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a method for preparing a plating solution for electroplating a tungsten-molybdenum-nickel 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 operatio...

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