Long-term storage of seamless steel pipes in sales shops may cause some rust problems. If the seamless steel pipe is rusty, it is not easy to sell. So how can we remedy the rust of the seamless steel pipe? Let's take a look together.
1. Tools for rust removal: mainly use wire brushes and other tools to polish the surface of seamless steel pipes, which can remove loose or warped oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach the Sa2 level, and the power tools can reach the Sa3 level.
: Generally, two methods of chemical and electrolysis are 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. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, its anchor pattern is shallow and it is easy to pollute the environment.
3. Spray (throwing) rust removal
: The spray rust removal is to drive the spray blades to rotate at a high speed through a high-power motor, so that steel grit, steel shot, iron wire segments, minerals and other abrasives are sprayed on the surface of the steel pipe under the action of centrifugal force. It can completely remove rust, oxide and dirt, and the seamless steel pipe can achieve the required uniform roughness under the action of the violent impact and friction of the abrasive. After spraying to remove rust, not only can the physical adsorption of the pipe surface be expanded, but also the mechanical adhesion of the anti-corrosion layer and the pipe surface can be enhanced. Therefore, spray rust removal is an ideal rust removal method for pipeline anticorrosion. Generally speaking, sand blasting and rust removal are mainly used for the inner surface treatment of pipes, and sand blasting and rust removal are mainly used for the outer surface treatment of pipes.
: Use solvent (character: transparent, colorless liquid) and emulsion to clean the surface of seamless steel pipe to remove oil, grease, dust, lubricant and similar organic matter, but it cannot remove the rust on the surface of seamless steel pipe. , Oxide scale, welding flux, etc., so it is only used as an auxiliary means in anti-corrosion production.
Tips: The surface treatment of seamless steel pipes (astm a106 seamless
) is one of the key factors that determine the anti-corrosion service life of pipelines. It is a prerequisite for whether the anti-corrosion layer and the steel pipe can be firmly combined. It has been verified by research institutes that the life of the anti-corrosion layer depends on factors such as the type of coating, coating quality and construction environment. The surface treatment of the steel pipe has an impact on the life of the anti-corrosion layer about 50%.