The purpose of surface sand blasting before thermal spraying

       The sandblasting pretreatment of the surface of the substrate is to use high-hardness abrasive particles to spray the surface of the substrate at a high speed, and to scour, chisel and hammer the surface of the substrate to remove the rust, scale, burr, welding slag, old ceramic coating on the surface of the substrate. layer and other contaminants, and form a substrate surface with considerable roughness, so that the metal substrate exposes the fresh active surface, and at the same time produces purification, roughening and activation effects. In addition, sandblasting also has a certain stress relaxation on the matrix material and has the effect of improving its fatigue strength. In addition, sandblasting has high production efficiency, so it is especially suitable for surface pretreatment and on-site construction of large-area and mass-produced products, so it has become the most commonly used surface pretreatment method in the industry.