Mainly use tools such as wire brushes to polish the steel surface. Cleaning and preheating the spiral welded pipe can remove loose or lifted scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the iron oxide scale is firmly attached to the surface of the steel, the rust removal effect of the tool will not be ideal, and the anchor pattern depth required for anti-corrosion construction will not be achieved.
Pickling uses solvents and emulsions to clean the surface of welded steel pipes (welded pipes) for low-pressure fluid transportation to remove oil, grease, dust, lubricants and similar organic matter, but it cannot remove rust, oxide scale, flux, etc. on the steel surface. Therefore, it is only used as an auxiliary means in anti-corrosion production.
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 post-rust treatment. Although chemical cleaning can achieve a certain degree of cleanliness and roughness on the surface, its anchor lines are shallow and can easily cause pollution to the spiral welded pipe stacking environment.
