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In the oil and gas pipeline anti-corrosion construction process, seamless steel pipe surface treatment is to determine the useful life of the pipeline one of the key factors, it is a seamless coating and seamless steel pipe can be a combination of the premise. In addition to the coating type, coating quality and construction environment and other factors, the surface treatment of seamless steel pipe on the life of the coating effect of about 50%, therefore, should be strictly in accordance with the anti-corrosion Layer specifications on the surface of seamless steel pipe requirements, continuous improvement of seamless steel pipe surface treatment methods, seamless steel pipe in addition to embroidery methods are the following:
1, cleaning
The use of solvents, emulsions to clean the surface of steel to achieve the removal of oil, grease, dust, lubricants and similar organic matter, but it can not remove the steel surface rust, oxide, welding, etc., so in the anti-government operations only as an auxiliary means.
2, pickling
General use of chemical and electrolytic two methods for pickling treatment, pipeline corrosion only use chemical pickling, you can remove the oxide, rust, the old coating, and sometimes can be used as a blasting after the re-treatment. Chemical cleaning, although the surface can achieve a certain degree of cleanliness and roughness, but the anchor is shallow, and easy to cause pollution to the surrounding environment.
3, the tool rust
Mainly the use of steel wire brush and other tools on the steel surface grinding, you can remove the loose oxide, rust, welding slag and so on. Manual tool derusting can reach Sa2 level, power tools rust can reach Sa3 level, if the steel surface attached to a solid iron oxide skin, tool rust effect is not ideal, not up to the requirements of anti-corrosion construction of the depth of the anchor.
4, spray rust
Jet rust is driven by high-power motor jet high-speed rotation, so that steel shot, steel sand, wire section, minerals and other abrasives in the motor under the strong centrifugal force on the surface of the seamless steel pipe jet treatment, not only can completely remove the oxide , Rust and dirt, and seamless steel pipe in the abrasive impact and the role of friction, but also to achieve the required uniform roughness.
After the rust is sprayed, it can not only expand the physical adsorption of the surface of the pipe, but also enhance the mechanical adhesion between the coating and the surface of the pipe. Therefore, the spray rust is the ideal way to rust preservative pipe. In general, shot peening is mainly used for the surface treatment of the tube, shot blasting is mainly used for seamless steel pipe surface treatment.

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