Methods to prevent rust of spiral steel pipe

　　Because spiral steel pipe is of relatively large individual quality, it must be stacked outdoors, but this is unavoidable by the sun and rain, so the problem of rust has been plagued by the storage time and conditions of spiral steel pipe.

　　Wire brush and other tools are mainly used to grind the steel surface. The cleaning and preheating of spiral steel pipe can remove loose or warped oxide scale, rust, welding slag and so on. Manual tool rust removal can reach Sa2, power tool rust removal can reach Sa3, if the steel surface adhered to a solid oxide scale, tool rust removal effect is not ideal, can not meet the requirements of anti-corrosion construction anchor line depth.

　　Acid pickling uses solvents and emulsions to clean the surface of spiral steel pipes for low-pressure fluid transportation in order to remove oil, grease, dust, lubricants and similar organic matter, but it can not remove rust, oxide scale, welding flux on the surface of steel, so ASTM A 106 Grade B API 5L 20 inch Spiral Steel Pipe is only used as an auxiliary means in anticorrosion production.

　　Generally, chemical and electrolytic methods are used for pickling treatment. Chemical pickling is only used for pipeline anticorrosion. Oxide scale, rust and old coatings can be removed. Sometimes it can be used as a re-treatment after sand blasting and rust removal. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, but its anchor lines shallow, and easy to cause pollution to spiral steel pipe stacking environment.