According to the requirements of the anti-corrosion coating standard for the appearance of large-diameter submerged arc steel pipes, the surface disposal methods of submerged arc steel pipes are improved from time to time
Use solvents and emulsions to clean the surface of the steel to remove oil, grease, dust, smoothing agent and similar organic matter, but it cannot remove the rust, oxide scale, welding flux, etc. on the surface of the steel, so it is only used as an auxiliary in anti-corrosion homework The trick is also one of the simple maintenance tricks.
Generally, two methods of chemical and electrolysis are employed to pickling. Pipeline anticorrosion only uses chemical pickling, which can remove the oxide scale, rust, and old coatings. Sometimes it can uses as sandblasting and rust removal. Although chemical cleaning can make the appearance reach a certain degree of cleanliness and roughness, its anchor pattern is shallow, and it easily pollutes the surrounding conditions, Meide Steel Control Manufacturing Co., Ltd. recommends against this method.
3. Derusting things
Use wire brushes and other things to polish the surface of the steel to remove loose oxide scale, rust, welding slag, etc. Hand-operated tools can reach the Sa2 level for rust removal, and power tools can reach the Sa3 level for rust removal. If the steel surface has adhered to a strong oxide scale, the results of rust removal of the tool will not be expected, and the anchor pattern depth required for anti-corrosion construction cannot be reached. Compared with the original rust removal method.
4. Radiation derusting
Radiation rust removal is a high-power motor that drives the radiating blades to twist at a high speed, so that steel shots, steel grit, iron wire segments, minerals, and other abrasives are radiated to the surface of the submerged arc steel pipe under the effect of the strong centrifugal force of the motor, which can not only remove oxides, Rust and dirt, and the submerged arc steel pipe can reach the required average roughness under the effect of the fierce abrasive impact and friction. It is a relatively complete method for removing rust. It is strongly recommended by Meide Steel Control Manufacturing Co., Ltd. After radioactive rust removal, not only can be the physical adsorption effect of the pipe surface be expanded, but also the mechanical adhesion effect of the anti-corrosion layer and the pipe surface can be enhanced. Therefore, radiation rust removal is a fantasy rust removal method for pipeline anticorrosion. Generally speaking, shot blasting should be employed to internal and external surface treatment of pipes, and shot blasting should be used for surface treatment of submerged arc steel pipes.