What effect does the surface roughness of steel grit have on the surface treatment of metals?

　　1. Impact on surface cleanliness

　　Enhance rust removal effect:

　　When the surface roughness of steel grit is large, there are more edges and protrusions on its surface. During the sandblasting process, these edges and protrusions can more effectively impact the rust layer, oxide scale and other impurities on the metal surface.

　　For example, when dealing with rusty steel structures, steel grit with a larger roughness can peel off the rust layer from the metal surface like a small shovel, and can remove rust more thoroughly than steel grit with a smooth surface, thereby improving the cleanliness of the metal surface.

　　Improve oil removal effect:

　　The rough surface of steel grit increases the contact area and friction with the oil on the metal surface. During the sandblasting process, the collision and friction between steel grit and the metal surface can better destroy the adhesion of oil stains, making it easier to remove oil stains.

　　For example, when dealing with metal parts stained with oil stains, rough steel grit can more effectively remove oil stains from microscopic pits and gaps on the metal surface, thereby improving the oil removal effect.

　　2. Impact on surface roughness

　　Precisely control surface roughness:

　　Steel sand with different roughness can form different roughness treatment effects on the metal surface. By selecting steel sand with appropriate roughness, the roughness of the metal surface can be accurately controlled to meet different usage requirements.