company news about The difference between sandblasting and shot blasting before metal surface coating

The difference between sandblasting and shot blasting in the metal surface coating anticorrosive shotblasting is a method of removing metal rust by using compressed air or mechanical centrifugal force as power and friction. The diameter of the projectile is between 0.2-2.5mm, the compressed air pressure is 0.2-0.6Mpa, and the Angle of the jet and the surface is about 30-90 degrees. The nozzles are made of T7 or T8 tool steel and quenched to a hardness of 50-55HRC. Each nozzle has a service life of 15-20 days. Shot peening in metal surface coating anticorrosive is used to remove the oxide, rust, sand and old paint film on medium and large metal products with a thickness of not less than 2mm or do not require accurate size and profile to be maintained. It is a cleaning method before surface coating (plating). It is widely used in large shipyards, heavy machinery factories, automobile factories and so on. Surface treatment with shot peening has great impact and obvious cleaning effect. However, the treatment of the sheet workpiece is easy to deform the workpiece, and the steel shot hits the surface of the workpiece (whether shot blasting or shot blasting) to deform the metal substrate, because Fe3O4 and Fe2O3 are not plastic, broken off, and the oil film deforms with the substrate, so for the workpiece with oil, shot blasting and shot blasting can not completely remove the oil.
Metal surface coating anti-corrosion sandblasting is also a mechanical cleaning method, but sandblasting is not shot blasting, sandblasting is sand such as quartz sand, shot blasting is a metal shot. Among the existing workpiece surface treatment methods, the best cleaning effect is sandblasting. Sand blasting is suitable for cleaning the workpiece surface with high requirements.