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A preparation method of an aluminum alloy oil drilling pipe threaded joint with insulation and wear resistance and corrosion resistance

A technology of threaded joints and corrosion resistance, applied in coatings, surface reaction electrolytic coatings, electrolytic coatings, etc., can solve the problems of wear resistance and high insulation performance, incomplete insulation, and reduced insulation performance, etc., to meet the requirements of threaded connections. Tolerance requirements, the effect of improving the filling and sealing effect, and the effect of improving the corrosion resistance

Active Publication Date: 2019-07-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used sealing agents include boiling water, chromate, silicate, phosphate, rare earth salt, etc., but the disadvantage of these commonly used sealing processes is that after the above-mentioned sealing treatment, the micro-arc oxidation ceramic coating cannot meet the requirements of corrosion resistance at the same time. Corrosion, wear resistance and high insulation performance and other performance requirements
Chinese patent (publication number is CN106757261A) discloses the use of hydration sealing technology for sealing, although simple and effective, but the sealing temperature is high, energy consumption is large and can not be completely insulated
The Chinese patent (publication number is CN101709497A) discloses a phytic acid sealing process, which has high requirements for the process, and cracks will appear in the formed phytic acid film layer. After a period of corrosion, the coating will have cracks and the insulation performance will be reduced. It cannot meet the protective requirements of aluminum alloy oil drilling pipe threaded connection joints after repeated disassembly and assembly

Method used

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  • A preparation method of an aluminum alloy oil drilling pipe threaded joint with insulation and wear resistance and corrosion resistance
  • A preparation method of an aluminum alloy oil drilling pipe threaded joint with insulation and wear resistance and corrosion resistance
  • A preparation method of an aluminum alloy oil drilling pipe threaded joint with insulation and wear resistance and corrosion resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Pretreatment: The sample is a 7-series aluminum alloy, and the thread of the aluminum alloy oil drilling pipe joint is processed according to GB / T 206659-2006; followed by water washing, alkali washing, pickling, and ultrasonic cleaning.

[0040] (2) Micro-arc oxidation treatment: the micro-arc oxidation power supply adopts AC power supply, voltage 540V, power supply frequency is 750Hz, pulse width 307μs, duty cycle 17%, electrolyte is composed of 15g / L sodium silicate, 5g / L sodium phosphate, 4g / L sodium hydroxide and 3mL / L glycerin. Use a stirring and cooling device to control the solution temperature at 15°C ± 1°C. Oxidation time 10min. After treatment, the thickness of the coating is 5 μm, and the color is gray.

[0041] (3) Preparation of ceramic / organic composite coating: the grafted polymer treatment solution takes epoxy silane coupling agent KH570 (γ-methacryloxypropyl trimethoxysilane coupling agent) as an example, and describes The process of preparing c...

Embodiment 2

[0058] (1) Pretreatment: use 2-series aluminum alloy, process the thread of aluminum alloy oil drilling pipe joint according to GB / T 206659-2006; then wash with water, alkali, pickling and ultrasonic cleaning.

[0059] (2) Micro-arc oxidation treatment: The difference from Example 1 is that the micro-arc oxidation electrolyte is composed of 25g / L sodium silicate, 3g / L sodium hydroxide and 3ml / L glycerin. The micro-arc oxidation time is 17min, the thickness is 10μm, and the coating color is off-white.

[0060] (3) Preparation of ceramic-organic composite coating: the grafted polymer treatment solution takes γ-glycidyl etheroxypropyltrimethoxysilane (KH560) and tetraethyl orthosilicate as examples, and describes the process of silane sol-gel Deals with the process of preparing ceramic-organic composite coatings on aluminum alloy surfaces.

[0061] ① Prepare a mixed solution of ethanol, tetraethyl orthosilicate, KH560, and deionized water with a volume ratio of 8:2:1:2, add acet...

Embodiment 3

[0066] (1) Pretreatment: use 6-series aluminum alloy, process the thread of aluminum alloy oil drilling pipe joint according to GB / T 206659-2006; then wash with water, alkali, pickling and ultrasonic cleaning.

[0067] (2) Micro-arc oxidation treatment: The difference from Example 1 is that the micro-arc oxidation power supply adopts a DC power supply, and the control current density is 5A / dm 2 , and the electrolyte consists of 20g / L sodium silicate, 4g / L sodium tungstate, 6ml / L glycerin and 2g / L potassium hydroxide composition. Using a stirring and cooling device, control the temperature of the solution at 30°C±5°C, micro-arc oxidation for 15min, the thickness is 6μm, and the coating color is dark gray.

[0068] (3) Preparation of ceramic / organic composite coating: graft polymer treatment solution n-octyltriethoxysilane and ethyl silicate as an example to describe the preparation of ceramic-organic composite coating on the surface of aluminum alloy by silane sol-gel treatmen...

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Abstract

The invention discloses a preparation method of the aluminum alloy petroleum drilling pipe threaded joint with insulation and wear-resistance corrosion resistance. The method is used for carrying outmicro-arc oxidation treatment on the threaded joint of the aluminum alloy oil drilling pipe, a ceramic coating with excellent wear resistance is generated on the surface of the joint in situ, and thena silane-containing compound, a silane coupling agent and 8-hydroxyquinoline are adopted through hydrolytic condensation reaction to obtain a polysilane solution; and the surface of the ceramic coating is coated with an organic polysilane coating with a corrosion self-healing effect through the dipping and solidifying. According to the method, the ceramic and the organic composite coating are prepared on the surface of the threaded joint, so that the insulation, wear resistance and corrosion resistance of the aluminum alloy joint are greatly improved, and the corrosion resistance requirementof the aluminum alloy drilling pipe threaded joint in a corrosion environment can be met after the threaded joint of the aluminum alloy drilling pipe is disassembled for many times; and the method issimple in process, low in cost, high in production efficiency, environmentally friendly and pollution-free in the production process, and beneficial to popularization and application.

Description

technical field [0001] The invention relates to a surface treatment technology for aluminum alloy oil drilling pipe threaded joints, in particular to a method for preparing a composite coating with high insulation performance, wear resistance and corrosion resistance on the surface of aluminum alloy oil drilling pipe thread joints, in particular to The arc oxidation technology forms a wear-resistant ceramic coating in situ on the surface of an aluminum alloy, and then prepares an organic coating with a corrosion self-healing effect on the generated ceramic coating, which belongs to the technical field of metal surface treatment. Background technique [0002] Steel oil drilling pipe in H 2 S / CO 2 Corrosion is very easy to occur in corrosive media such as carbon dioxide, which cannot meet the normal drilling requirements. Aluminum alloy can spontaneously form a passivation film of aluminum oxide in this corrosive medium, which has natural corrosion resistance. However, this...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/06C25D11/24
CPCC25D11/026C25D11/06C25D11/24
Inventor 刘志义曾娣平柏松赵娟刚刘冠华
Owner CENT SOUTH UNIV