Long term storage of seamless steel pipes inevitably leads to some rusting issues. Once seamless steel pipes rust, they are not easy to sell. So how can we remedy seamless steel pipe rust? Below, the editor will take you to understand.
1. Tool rust removal: mainly use tools such as wire brushes to polish the surface of seamless steel pipes, which can remove loose or raised oxide skin, rust, welding slag, etc. Manual tools can achieve Sa2 level rust removal, while power tools can achieve Sa3 level rust removal. If the surface of seamless steel pipes is firmly adhered with oxide scale, the tool's rust removal effect is not ideal and cannot meet the anchor depth required for anti-corrosion construction.
2. Acid cleaning: Generally, two methods are used for acid cleaning: chemical and electrolytic. Chemical acid cleaning is only used for pipeline anti-corrosion, which can remove oxide skin, rust, and old coatings. Sometimes, it can be used as a pre-treatment after sandblasting and rust removal. Although chemical cleaning can achieve a certain level of cleanliness and roughness on the surface, its anchor pattern is shallow and prone to environmental pollution.
3. Spray (throwing) rust removal: Spray (throwing) rust removal is achieved by using a high-power motor to drive the spray (throwing) blades to rotate at high speed, causing abrasives such as steel sand, steel shot, iron wire segment, and minerals to spray (throwing) treatment on the surface of the steel pipe under centrifugal force. Not only can iron rust, oxides, and dirt be completely removed, but seamless steel pipes can also achieve the required uniform roughness under the strong impact and friction of the abrasive.
4. Cleaning: Use solvents and emulsions to clean the surface of seamless steel pipes to remove oil, grease, dust, lubricants, and similar organic substances. However, it cannot remove rust, oxide skin, welding flux, etc. on the surface of seamless steel pipes, so it is only used as an auxiliary means in anti-corrosion production.