Galvanic deposit composite plating method and plating solution for oil casing coupling screw thread

A composite coating solution and oil casing technology, which is applied in the surface treatment field of oil casing coupling threads, can solve the problems of high price, coating peeling, and up to hundreds of thousands of yuan, so as to improve anti-sticking performance, good durability Anti-friction performance, uniform particle distribution effect

Active Publication Date: 2009-01-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the rapid development of technology, the oil field has higher and higher requirements for material performance, and the nickel-based alloy special buckle oil casing with a high corrosion resistance and high strength alloy content of more than 70% has been gradually applied, and the traditional copper plating layer is used. The anti-sticking performance of the nickel-based alloy special buckle cannot meet the requirements of the use. Usually, the plating layer falls off and the buckle phenomenon occurs once the buckle is put on and off. At the same time, due to its high price, it is as high as hundreds of thousands of yuan per ton. It is more important to protect the special thread of the alloy thread to increase the service life of the oil casing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix 1 part by weight of fatty alcohol polyoxyethylene ether (Pingpingjia SA-20) with 20 parts by weight of PTFE emulsion (resin content 60%, particle size ≤ 0.20um) to obtain a surfactant mixture, which is set aside. Dissolve 10 grams of sodium cyanide in warm water at about 40°C, and then add 40 grams of cuprous cyanide in batches under stirring to make it dissolve and clarify; dissolve 10 grams of sodium hydroxide in distilled water, and then, under stirring, Slowly add 50 grams of sodium stannate to the sodium hydroxide solution, mix it with the previous solution after clarification, then add water to make it 1 liter, at 2.5A / dm 2 After electrolysis for 2 hours at a certain cathode current density, the alkaline plating solution was obtained by filtering through a filter screen for subsequent use. Add the surfactant mixture solution to the alkaline plating solution with an additive amount of 10g / L, heat the plating solution to 40°C, and the nickel-based alloy (21~23.5...

Embodiment 2

[0018] Mix 1 part by weight of fatty alcohol polyoxyethylene ether (Pingpinga 0-7) with 50 parts by weight of PTFE emulsion (resin content 55%, particle size ≤ 0.20um) to obtain a surfactant mixture, which is set aside. Dissolve 55 grams of sodium cyanide in warm water at about 40°C, then add 5 grams of cuprous cyanide in batches under stirring to make it dissolve and clarify; dissolve 55 grams of sodium hydroxide in deionized water, and then Slowly add 55 grams of sodium stannate to the sodium hydroxide solution, mix it with the previous solution after clarification, then add water to make it 1 liter, at 1A / dm 2 electrolysis at a cathodic current density. After 3 hours, filter through a filter to obtain an alkaline plating solution for subsequent use. Add the surfactant mixture solution to the alkaline plating solution with an additive amount of 60g / L, heat the plating solution to 50°C, and the nickel-based alloy (26.0~28.0%Cr, 29.5~32.5%Ni, 2.5%Mn, 3.0~4.0% %Mo, 0.6~1.4%Cu...

Embodiment 3

[0020] Mix 1 part by weight of fatty alcohol polyoxyethylene ether (Pingpingjia 0-25) with 35 parts by weight of PTFE emulsion (resin content 65%, particle size ≤ 0.20um) to obtain a surfactant mixture, which is set aside. Dissolve 30 grams of sodium cyanide in warm water at about 40°C, then add 20 grams of cuprous cyanide in batches under stirring to make it dissolve and clarify; dissolve 20 grams of sodium hydroxide in distilled water, and then, under stirring, Slowly add 30 grams of sodium stannate to the sodium hydroxide solution, mix it with the previous solution after clarification, then add water to make it 1 liter, at 5A / dm 2 electrolysis at a cathodic current density. After 2 hours, filter through a filter to obtain an alkaline plating solution for future use. Add the surfactant mixture solution to the alkaline plating solution with an additive amount of 40g / L, heat the plating solution to 60°C, and the nickel-based alloy (21~23.5%Cr, 18~21%Fe, 1%Mn, 6~8 %Mo, 5% Co,...

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PUM

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Abstract

The invention relates to an electro-deposition composite plating method of oil-sleeve collar-joint screw-threads and a plating solution thereof. The method includes the following steps: a composite plating solution comprises surfactant mixed solution and alkalescence plating solution with the usage ratio of 10g to 60g:1L, wherein the surfactant mixed solution comprises fatty alcohol-polyxyethylene ether and polytetrafluoroethylene latex with the weight ratio of 1: 20 to 1: 50. Self-lubricating composite plating obtained on the screw surface of the nickel-base alloy oil-sleeve collar-joint by the method and the plating solution of the invention has good wear resistance and antifriction performance and can improve the pick resistance of the oil-sleeve collar-joint.

Description

technical field [0001] The invention relates to the surface treatment of the thread of the coupling thread of the oil casing pipe, and more particularly relates to an electrodeposition composite plating method and a plating solution for the thread of the coupling thread of the nickel base alloy oil casing pipe. Background technique [0002] The oil casing coupling is an important connecting part of the oil casing. The thread sticking of the coupling is the most common form of damage and failure in the use of various oil casings. When the coupling is on and off, the internal and external threads are formed. For a pair of friction pairs, when the inner and outer thread surfaces are in contact with each other, due to the large contact stress of the thread interference fit surface, elastic-plastic deformation and "cold welding" (Cold welding) phenomenon are caused. Sliding and being sheared, causing the tearing of the thread of the oil well pipe joint, that is, the failure of th...

Claims

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Application Information

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IPC IPC(8): C25D3/58
Inventor 马刘宝朱靖王琍张忠铧
Owner BAOSHAN IRON & STEEL CO LTD
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