1. Mainly use wire brushes and other tools to polish the steel surface. The cleaning and preheating of spiral welded steel pipes can remove loose or raised scales, rust, welding slag, etc. Hand tool de-rusting can reach the Sa2 level, and power tool de-rusting can reach the Sa3 level. If the iron oxide scale is firmly attached to the surface of the steel, the de-rusting effect of the tool is not ideal, and the anchor pattern depth required for anti-corrosion construction cannot be reached.
2. 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 substances, but it cannot remove rust, scale, and flux on the steel surface, etc., so it is only used as an auxiliary means in anticorrosion production.
3. Generally, two methods of chemical and electrolytic pickling are used for pickling treatment. Only chemical pickling is used for pipeline anticorrosion, which can remove scale, rust, and old coatings. Sometimes it can be used as retreatment after sandblasting and rust removal. Although chemical cleaning can achieve the cleanliness and roughness of the surface, its anchor lines are shallow, and it is easy to pollute the stacking environment of spiral welded pipes.