Sand blasting, also known as sand blasting, is a surface treatment method that uses high-speed jets of sand to polish the metal surface to remove rust, scale and dirt, while improving the roughness of the metal surface. Why is steel pipe (such as seamless pipe or welded pipe) required to be sandblasted before anticorrosion?
1. Improve the roughness of the steel pipe surface
Sandblasting can effectively improve the surface roughness of the steel pipe and create good conditions for coating adhesion. The adhesion between the coating and the steel pipe surface mainly depends on mechanical anchorage. The surface of the steel pipe after sand blasting and external treatment forms many tiny unevenness, which increases the contact area between the coating and the steel pipe surface, thereby improving the adhesion of the coating.
2. Remove surface dirt and scale
During the production, transportation and storage of steel pipes, various dirt will adhere to the surface, such as rust, scale, oil and so on. These impurities will affect the adhesion between the coating and the steel pipe surface and reduce the anti-corrosion effect. Sandblasting can effectively remove surface dirt and ensure that the coating is tightly bonded to the steel pipe surface.
3. Improve the stress state of the steel pipe surface
Sandblasting can effectively improve the stress state of the steel pipe surface. During sand blasting, the sand particles have a uniform impact force on the surface of the steel pipe, causing slight periodic deformation on the surface of the steel pipe, thereby reducing the residual stress on the surface and prolonging the service life of the steel pipe.
4. Improve coating quality
The surface roughness of the steel pipe after sandblasting is increased, and the adhesion between the coating and the steel pipe surface is improved, making the coating more firm. At the same time, sandblasting can make the coating more closely bonded to the surface of the steel pipe, reduce the air gaps and gaps under the coating, and improve the sealing and corrosion resistance of the coating. The steel pipe coating after sandblasting is more uniform and smooth, which not only improves the anti-corrosion performance of the coating, but also improves the overall aesthetics of the steel pipe.
5. Enhance the wear resistance of the coating
Sand blasting can make the surface of steel pipe more uniform and smooth, which is beneficial to the uniform distribution of dry coating. The coating after sandblasting is more compact, and the wear resistance is significantly improved, thus prolonging the service life of the steel pipe.
6. Improve production efficiency
Sand blasting is a fast and efficient surface treatment method that can greatly improve production efficiency. Compared with traditional manual rust removal and grinding, sandblasting is faster and more efficient, saving manpower and time costs.
To sum up, the sandblasting treatment of steel pipes before anticorrosion is of great significance to improve the quality and effect of anticorrosion coatings. Sand blasting can not only remove surface dirt and improve coating adhesion, but also improve the stress state on the surface of the steel pipe and improve the wear resistance of the coating, thereby prolonging the service life of the steel pipe. Therefore, sandblasting is an indispensable key link in steel pipe anticorrosion engineering.
没有评论:
发表评论