Rust can be removed during sandblasting, and it is not necessary to polish and remove rust before sandblasting.
Quartz sand for sand blasting, ordinary quartz sand and refined quartz sand (refers to metal surface rust removal or electroplating): high hardness and good rust removal effect. The quality of pretreatment before sandblasting affects the adhesion, appearance, moisture resistance and corrosion resistance of the coating. If the pretreatment work is not done well, the corrosion will continue to spread under the coating, resulting in the coating falling off in pieces.
After careful cleaning of the surface and simple cleaning of the workpiece, the life of the coating is 4-5 times that of the exposure method. There are many methods for surface cleaning, but the most commonly accepted methods are solvent cleaning, acid cleaning, hand tools and electric tools.
Extended data:
Sand blasting can be used in the following fields:
65438+ or adhesive parts are more firmly bonded and have better quality.
2. Cleaning and polishing of rough surfaces of castings and workpieces after heat treatment. Sand blasting can clean all dirt (such as scale and oil residue). ) After heat treatment, the surfaces of castings and forgings and workpieces are polished to improve the smoothness of workpieces, so that the workpieces present uniform metal colors and make the workpieces look more beautiful.
3. Burr cleaning and surface beautification sandblasting of machined parts can clean up tiny burrs on the surface of the workpiece, make the surface of the workpiece smoother, eliminate the harm of burrs and improve the grade of the workpiece. Moreover, sandblasting can make a small fillet at the junction of the workpiece surface, which makes the workpiece look more beautiful and precise.
4, improve the mechanical properties of parts, mechanical parts after sandblasting, can produce uniform and fine concave and convex surface on the surface of parts, so that lubricating oil can be stored, thereby improving lubrication conditions, reducing noise and improving the service life of machinery.
5, the role of light decoration For some special-purpose workpieces, sandblasting can achieve different reflections or matt at will. For example, the polishing of stainless steel workpieces and plastics, the polishing of jade articles, the extinction of wooden furniture surfaces, the patterns on frosted glass surfaces, and the roughening of cloth surfaces.
References:
Baidu encyclopedia-sandblasting