The long-term storage of
seamless pipes will inevitably cause some rust problems. Once the seamless steel pipe is rusted, it is not easy to sell, so what can we do to remedy the rust of the seamless steel pipe?
1. Cleaning: Use solvents and emulsions to clean the surface of seamless steel pipes to remove oil, grease, dust, lubricants and similar organic substances, but it cannot remove rust, oxide skin, welding flux, etc. Anti-corrosion production is only used as an auxiliary means.
2. Tool rust removal: mainly use tools such as wire brushes to grind the surface of seamless steel pipes, which can remove loose or raised oxide scale, rust, welding slag, etc.
The rust removal of manual tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the surface of the seamless steel pipe is firmly attached to the iron oxide scale, the rust removal effect of the tool is not ideal, and the anchor pattern depth required for anti-corrosion construction cannot be achieved.
3. Pickling: Generally, two methods of chemical and electrolytic pickling are used for pickling. Pipeline anti-corrosion only uses chemical pickling, which can remove oxide 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 achieve a certain degree of cleanliness and roughness, its anchor pattern is shallow and it is easy to cause pollution to the environment.
4. Spray (throwing) rust removal: The spray (throwing) rust removal is driven by a high-power motor to drive the spray (throwing) blade to rotate at a high speed, so that the abrasives such as steel sand, steel shot, iron wire, and minerals are under the action of centrifugal force. Spray (throwing) the surface of the steel pipe,
Not only can rust, oxides and dirt be completely removed, but the seamless steel pipe can also achieve the required uniform roughness under the action of the violent impact and friction of the abrasive.
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