1. Mainly use tools such as wire brushes to grind the surface of the steel. The cleaning and preheating of the
spiral welded steel pipe can remove the loose or warped scale, 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 steel surface adheres to a firm scale of iron oxide, the rust removal effect of the tool is not ideal, and the anchor pattern depth required for anti-corrosion construction cannot be achieved.
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, oxide skin, welding flux on the surface of the steel, etc., so it is only used as an auxiliary means in anti-corrosion production.
3. Generally, two methods of chemical and electrolysis are used for pickling treatment. Pipeline anti-corrosion only adopts chemical pickling, which can remove oxide scale, rust, and old coating. Sometimes it can be used as re-treatment after sandblasting and rust removal. Although chemical cleaning can make the surface clean and rough, its anchor pattern is shallow, and it is easy to cause pollution to the
spiral welded steel pipe stacking environment.
