Introduction to methods for removing rust from spiral steel pipes

1. Sandblasting method: Sandblasting uses a high-power motor to drive the sandblasting blades to rotate at high speed, so that steel sand, steel shot, wire segments, minerals, and other abrasives are sandblasted on the surface of the steel pipe under the effect of centrifugal force. It can not only completely remove rust, oxides, and dirt, but also the spiral steel pipe can reach the required uniform roughness under the effect of severe impact and friction of the abrasive.

2. Pickling method: Usually chemical and electrolytic methods are used for pickling treatment. Pipeline anti-corrosion only uses chemical pickling, which can remove oxide scale, rust, and old coating. Sometimes it can be used as a re-treatment after sandblasting. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, its anchor pattern is shallow and it is easy to pollute the environment.

3. Tool rust removal method: First, use tools such as wire brushes to grind the surface of the spiral steel pipe to remove loose or raised oxide scales, rust, welding slag, etc. Manual tool rust removal can reach the Sa2 level, and power tool rust removal can reach the Sa3 level. If the surface of the spiral steel pipe is strongly attached to the iron oxide scale, the tool rust removal effect is not ideal and the anchor pattern depth required for anti-corrosion construction cannot be achieved.

4. Cleaning method: Use solvents and emulsions to clean the surface of the spiral steel pipe to remove oil, grease, dust, lubricants, and similar organic matter, but it cannot remove rust, oxide scale, welding flux, etc. on the surface of the spiral steel pipe, so it is only used as an auxiliary method in anti-corrosion.