1. When cleaning the surface of hot-dip seamless galvanized pipe, we usually use the following methods. Generally, solvents are used to clean the surface of steel to remove oil, grease, dust, lubricants, but it cannot remove rust, oxide scale (corrosion products formed by oxidation), welding flux, etc. on the surface of steel, so it is used in anti-corrosion production Only as an aid.
2. Mainly use tools such as wire brushes to polish the steel surface, which can remove loose or warped oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the steel surface is adhered with solid oxide scale, the tool rust removal effect is not ideal, and the anti-corrosion construction requirements are not met.
3. Two methods of chemical and electrolysis are also used for pickling. Pipeline anticorrosion 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.
4. Spraying the surface of hot-dip galvanized seamless pipe can not only clean up rust, oxide and dirt, but also the steel pipe can achieve the required uniform roughness under the action of the violent impact and friction of the abrasive. Seamless galvanized pipe have a hollow section and are used in large quantities as pipelines for conveying fluids, such as pipelines for conveying petroleum, water and certain solid materials. Compared with solid steel such as round steel, steel pipe has a lighter weight when the bending and torsion strength is the same, and it is a kind of economical cross-section steel.