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

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...

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