(1) Spray (throwing) rust removal: Spray (throwing) rust removal uses a high-power motor to drive the spray (throwing) blades to rotate at high speed, so that steel sand, steel shots, wire segments, minerals, and other abrasives are caused by centrifugal force. Spraying (throwing) the surface of the steel pipe can not only completely remove rust, oxides, and dirt, but also the steel pipe can achieve the required uniform roughness under the action of the strong impact and friction of the abrasive.
(2) Tool rust removal: Mainly use tools such as wire brushes to polish the surface of the steel to remove loose or lifted oxide scales, rust, welding slag, etc. The rust removal of hand tools can reach the Sa2 level, and the rust removal of power tools can reach the Sa3 level. If the surface of the steel material is adhered to a strong iron oxide scale, the rust removal effect of the tool will not be ideal and the anchor pattern depth required for anti-corrosion construction will not be reached.
(3) Pickling: Chemical and electrolytic methods are generally 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 reprocessing after sandblasting and rust removal. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, its anchor lines are shallow and can easily cause pollution to the environment.
(4) Cleaning: Use solvents and emulsions to clean the steel surface to remove oil, grease, dust, lubricants, and similar organic matter. However, it cannot remove rust, oxide scale, welding flux, etc. on the steel surface, so it is not suitable for anti-corrosion. It is only used as an auxiliary method during production.
Post time: Jan-08-2024