Introduction to the embroidery removal technology of submerged arc steel pipes: During the anti-corrosion construction process of oil and gas pipelines, the surface treatment of large-diameter submerged arc steel pipes is a key factor that determines the anti-corrosion service life of the pipeline, that is, whether the anti-corrosion layer and the large-diameter submerged arc steel pipes can be firmly connected. The premise of the system. According to research conducted by research institutions, in addition to factors such as coating type, coating, and construction conditions, the surface treatment of large-diameter submerged arc steel pipes accounts for about 50% of the impact on the life of the anti-corrosion layer. Therefore, anti-corrosion coatings should be strictly followed Layer standards have requirements for the surface of large-diameter submerged arc steel pipes, and continuously improve the surface treatment methods of submerged arc steel pipes.
1. Cleaning
Solvents and emulsions are used to clean the surface of steel to remove oil, grease, dust, lubricants, and similar organic matter. However, it cannot remove rust, scale, flux, etc. on the surface of steel, so it is only used as an auxiliary in defense operations. Techniques are also simple maintenance techniques.
2. Pickling
Generally, chemical and electrolytic methods are used for pickling treatment. Only chemical pickling is used for pipeline anti-corrosion, which can remove scale, rust, and old coatings. Sometimes it can be used as a reprocessing after sandblasting and rust removal. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, its anchor lines are shallow and it can easily cause pollution to the surrounding environment. Meide Steel Control Manufacturing Co., Ltd. does not recommend this method.
3. Remove rust from things
Use tools such as wire brushes to polish the surface of the steel to remove loose scale, rust, welding slag, etc. The rust removal of hand tools can reach the Sa2 level, and the rust removal of power tools can reach the Sa3 level. If there is a strong iron oxide scale attached to the surface of the steel, the rust removal effect of the tool will be unsatisfactory and the anchor pattern depth required for anti-corrosion construction will not be reached. This is a kind of Comparison with the original rust removal method.
4. Radiation rust removal
Radiation rust removal uses a high-power motor to drive the radiation blades to rotate at high speed so that abrasives such as steel shot, steel sand, iron wire segments, minerals, etc. can be radiated on the surface of the submerged arc steel pipe under the action of the powerful centrifugal force of the motor. It can not only remove oxides, Rust, and dirt, but the submerged arc steel pipe can also achieve the required uniform roughness under the strong impact and friction of abrasives. It is a relatively perfect rust removal method and is highly recommended by Meide Steel Control Manufacturing Co., Ltd. After radiation rust removal, it can not only expand the physical adsorption effect on the pipe surface but also strengthen the mechanical adhesion effect between the anti-corrosion layer and the pipe surface. Therefore, radiation rust removal is an ideal rust removal method for pipeline anti-corrosion. Generally speaking, shot blasting is used for internal and external treatment of pipes, and shot blasting is used for surface treatment of submerged arc steel pipes.
Post time: Oct-19-2023