Due to the relatively large individual mass of spiral welded steel pipes, they must be stacked outdoors, but it is difficult to avoid being exposed to the sun and rain, so the problem of rust has always plagued the storage time and conditions of
spiral welded steel pipes.
Steel wire brushes and other tools are mainly used to polish the steel surface. The cleaning and preheating of spiral welded steel pipes can remove loose or warped 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. 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, solder, etc. on the steel surface. Therefore, it is only used as an auxiliary means in anti-corrosion production.
Generally, chemical and electrolytic methods 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 make the surface reach a certain degree of cleanliness and roughness, its anchor lines are shallow, and it is easy to cause pollution to the stacking environment of spiral welded steel pipes. Reasonable use of means to clean up rusted pipe fittings ensures that the pipe fittings will serve production for a long time and create more production benefits.
