Anticorrosion, insulation and wear-resisting treatment method for oil pipeline surface

A technology for oil pipelines and wear-resistant treatment, which is applied in the direction of gaseous chemical plating, coating, metal material coating technology, etc. It can solve the problems of not being able to work for a long time under high temperature and high corrosion environments, and achieve improved smoothness and sealing performance , Improve corrosion resistance, high surface wear resistance effect

Active Publication Date: 2017-05-10
SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through several innovative experiments, a method that can form a dense anti-corrosion and insulating diamond-like film on the surface of oil pipelines, especially on the surface of oil pipeline threads and flanges, solves the problem of existing insulating ceramic coatings, insulation Gasket and insulating organic coating technology cannot work for a long time under high temperature and high corrosion environment. The hardness of the integral dense anti-corrosion insulating protective film formed by the present invention is 2000-3000HV, and the resistivity is >2×10 9 Ω cm, the entire deposition process can be carried out below 500°C, which can well preserve the mechanical properties of the material of the deposited workpiece. The application on flanges and other parts does not need to consider the problem of sealing performance and stability when used in combination with other means, and has broad application prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The anti-corrosion and insulation treatment of the surface of the threaded thread of the oil pipeline includes the following steps:

[0049] (1) Perform surface gas nitriding treatment on the surface of the oil pipeline thread to be treated, and the nitriding medium is ammonia gas NH 3 , the nitriding temperature is controlled at 500°C, the nitriding time is controlled at 5 hours, and the nitriding treatment is cooled to room temperature;

[0050] (2) Put the oil pipeline thread treated in step (1) into an electrolytic polishing pool to electropolish the surface of the thread, with the thread as the anode and the graphite as the cathode. The electrolyte is a mixed solution of 90% sulfuric acid, glycerin, saccharin and 98% phosphoric acid. The mixing volume ratio of each solution is 200:20:3:500; the control current density is 35A / dm 2 , the temperature is kept at 60°C, the time is 5min, and the surface roughness of the polished threaded workpiece is required to be Ra≯0...

Embodiment 2

[0059] Anti-corrosion and insulation treatment on the surface of oil pipeline flanges includes the following steps:

[0060] (1) Perform surface gas nitriding treatment on the oil pipeline flange to be treated, and the nitriding medium is ammonia gas NH 3 , the nitriding temperature is controlled at 530°C, the nitriding time is controlled at 6 hours, and the nitriding treatment is cooled to room temperature;

[0061] (2) Put the oil pipeline flange treated in step (1) into the electropolishing pool to electropolish the surface of the flange, the flange is the anode, and the graphite is the cathode. The electrolyte is a mixed solution of 90% sulfuric acid, glycerin, saccharin and 98% phosphoric acid. The mixing volume ratio of each solution is 27:2.5:0.5:70; the control current density is 45A / dm 2 , the temperature is kept at 65°C, the time is 5min, and the roughness of the flange workpiece surface after polishing is required to be Ra≯0.40μm;

[0062] (3) Clean the surface of...

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PUM

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Abstract

The invention provides an anti-corrosive insulated wear-resistant treatment method for a petroleum pipeline surface. The method comprises the following steps: 1 carrying out surface gas nitriding treatment; 2 carrying out surface electrolytic polishing treatment in an electrolytic polishing pond; 3 carrying out surface cleaning treatment in an ultrasonic cleaning tank; 4 carrying out surface argon ion bombardment cleaning treatment in chemical vapor deposition equipment; and 5 carrying out vapor deposition on a diamond-like carbon film which is 1-10micron thick in the chemical vapor deposition equipment. Through the technical scheme provided by the invention, the hardness of a dense anti-corrosive insulated protection film formed on the petroleum pipeline surface is 2,000-3,000HV; the electrical resistivity is greater than 2*10<9>ohm.cm; the film deposition process can be carried out below 500 DEG C; the mechanical property of the material of a petroleum pipeline workpiece can be well reserved; meanwhile, the film which is not greater than 10 microns can cover the inner surface and the outer surface of the workpiece; the anti-corrosive, wear-resistant and insulating properties of the part surfaces of screw threads and flanges of the petroleum pipeline are greatly improved; and the process is simple and easy to popularize.

Description

technical field [0001] The invention relates to anticorrosion and insulation technology in the petroleum industry, in particular to a method for anticorrosion, insulation and wear-resistant treatment of the surface of petroleum pipelines based on a vapor deposition method. Background technique [0002] Pipelines, valves and other parts in the petroleum industry work in high sulfide and hydride environments for a long time, and most of the pipelines and valves are made of carbon steel, so the problem of corrosion failure is very serious. In order to solve such a problem, a common method is to use dissimilar metals such as nickel-based materials and austenitic stainless steel in a highly corrosive environment to solve the problem and achieve a comprehensive solution under anti-corrosion requirements and cost control. However, there is a potential difference between dissimilar metals. The localized corrosion at the contact of dissimilar metals in the medium caused by this poten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00C23C8/26C25F3/24C23C16/27
Inventor 王春昌马尚刘鸣张亚飞
Owner SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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