In the oil and gas pipeline anti-corrosion construction process, LSAW steel pipe anti-corrosion surface treatment is to determine the life of one of the key factors, it is LSAW steel pipe anti-corrosion layer and whether the combination of a solid premise. The study of professional organizations, in addition to the life of the coating depends on the type of coating,Coating quality and construction of environmental factors, LSAW steel pipe coating surface treatment of life-span of about 50%, therefore, should be strictly in accordance with standard coating the surface of LSAW welded steel pipe requirements, continuous improvement straight seam steel surface treatment method,LSAW steel pipe are mainly the following methods in addition to embroidery categories:
1, the use of solvent cleaning, emulsion cleaning the steel surface, in order to achieve the removal of oil, grease, dust, lubricants and similar organisms, but it can not remove the steel surface rust, oxide, welding flux, etc., so the anti-government operations only as an adjunct.
2, pickling
Generally two methods used to do chemical and electrolytic pickling process, coating steel pipe using only chemical etching, to remove oxidation, rust, old coatings, sometimes used as a sand-blasting after reprocessing. Although chemical cleaning can achieve a certain surface cleanliness and roughness, but the anchor pattern light, and easy to pollute the surrounding environment.
3, tools rust
Mainly use a wire brush and other tools on the polished steel surface, can remove loose oxide, rust, welding slag. Hand tools rust can reach Sa2 grade power tools rust up Sa3 level, if attached to a solid steel surface oxide scale, tools rust is not satisfactory,Reach the construction requirements of corrosion depth of anchor pattern.
4, spray rust spray rust by high-power high-speed rotating blade motor driven spray, so that steel shot, grit, wire segments, minerals and other abrasive strong centrifugal force in the motor straight seam steel pipes under the surface of the spray treatment, not only You can completely remove oxides, rust and dirt and mild steel pipe in severe abrasive impact and the role of friction, but also to achieve the required uniform roughness. Spray rust, can not only expand the role of physical adsorption tube surface, and can enhance the corrosion layer and the mechanical adhesion of the tube surface. Therefore, the jet rust is the ideal way to pipe corrosion.
