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Method for electroplating cobalt tungsten molybdenum iron alloy coating on surface of oil pumping part

A cobalt-iron alloy and component technology, which is applied in the field of electroplating tungsten-molybdenum-cobalt-iron alloy coating on the surface of oil pumping components, can solve the problems of poor compression and wear resistance, unsolved problems, and expensive corrosion-resistant alloys, and achieves good corrosion resistance and resistance. The effect of friction, less environmental hazard and stable process

Inactive Publication Date: 2014-12-24
无锡市锡山区鹅湖镇荡口青荡金属制品厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A method for electroplating a tungsten-molybdenum-cobalt-iron alloy coating on the surface of an oil pumping part, the composition of the plating solution used in the method is: ferrous sulfate 56g / L, sodium tungstate 18g / L, sodium molybdate 6g / L, cobalt sulfate 12g / L, sodium hypophosphite 8g / L, boric acid 17g / L, ammonium sulfate 20g / L, tartaric acid 34g / L, potassium pyrophosphate 11g / L, ascorbic acid 14g / L, formaldehyde 1ml / L, dimethylhexynol 4ml / L, thiourea 2mg / L, and the balance is water. The process is as follows: the oil pumping parts are cleaned and activated and put into the above-mentioned plating solution as the cathode, and graphite is used as the anode, and the pH value is adjusted with ammonia water. 7.5-8.5, heating to 65-75°C, control the current density at 12-16A / dm 2 , electroplating for 20 minutes.

Embodiment 2

[0012] A method for electroplating a tungsten-molybdenum-cobalt-iron alloy coating on the surface of an oil pumping part, the composition of the plating solution used in the method is: ferrous sulfate 60g / L, sodium tungstate 14g / L, sodium molybdate 10g / L, cobalt sulfate 8g / L, sodium hypophosphite 10g / L, boric acid 13g / L, ammonium sulfate 24g / L, tartaric acid 30g / L, potassium pyrophosphate 15g / L, ascorbic acid 10g / L, formaldehyde 3ml / L, dimethylhexynol 2ml / L, thiourea 4mg / L, and the balance is water. The process is as follows: the oil pumping parts are cleaned and activated and put into the above-mentioned plating solution as the cathode, and graphite is used as the anode, and the pH value is adjusted with ammonia water. 7.5-8.5, heating to 65-75°C, control the current density at 12-16A / dm 2 , electroplating for 30 minutes.

Embodiment 3

[0014] A method for electroplating a tungsten-molybdenum-cobalt-iron alloy coating on the surface of an oil pumping part. The plating solution used in the method consists of: ferrous sulfate 58g / L, sodium tungstate 16g / L, sodium molybdate 8g / L, cobalt sulfate 10g / L, sodium hypophosphite 9g / L, boric acid 15g / L, ammonium sulfate 22g / L, tartaric acid 32g / L, potassium pyrophosphate 13g / L, ascorbic acid 12g / L, formaldehyde 2ml / L, dimethylhexynol 3ml / L, thiourea 3mg / L, and the balance is water. The process is as follows: the oil pumping parts are cleaned and activated and put into the above-mentioned plating solution as the cathode, and graphite is used as the anode, and the pH value is adjusted with ammonia water. 7.5-8.5, heating to 65-75°C, control the current density at 12-16A / dm 2 , electroplating for 25 minutes.

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Abstract

The invention discloses a method for electroplating a cobalt tungsten molybdenum iron alloy coating on surface of an oil pumping part. A liter of plating liquid comprises the following components: 56-60g ferrous sulphate, 14-18g sodium tungstate, 6-10g sodium molybdate, 8-12g cobaltous sulfate, 8-10g sodium hypophosphate, 13-17g boric acid, 20-24g ammonium sulfate, 30-34g tartrate, 11-15g potassium pyrophosphate, 10-14g ascorbic acid, 1-3ml formaldehyde, 2-4ml dimethyl alkynol, 2-4mg thiourea and the balance of water. The method comprises the following steps: cleaning the oil pumping part and activating, placing in the plating liquid as cathode, taking graphite as anode, adjusting the pH value to 7.5-8.5 by ammoniacal liquor, heating to 65-75 DEG C, and electroplating at the current density being 12-16A / dm<2> for 20-30 minutes.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a method for electroplating a tungsten-molybdenum-cobalt-iron alloy coating on the surface of an oil pumping component. 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 wells (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
Inventor 钱永清
Owner 无锡市锡山区鹅湖镇荡口青荡金属制品厂
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