Sandblasting is a surface treatment technology that removes oxide scale, rust, impurities, etc. on the metal surface by spraying sand particles at high speed to achieve the effect of surface cleaning and roughening. In the sandblasting process, it is very important to choose the right sand type, as it directly affects the sandblasting effect and surface quality.
Generally speaking, the types of sand used in abrasive blasting can be divided into two main categories: soft sand and hard sand. Soft sand has a fine particle size and can be used to remove thinner scales and rust without scratching or damaging the surface. Hard sand has a coarser particle size, which can be used to remove thicker oxide scale and impurities, and at the same time can form a certain roughness on the surface to improve the adhesion of the coating.
Specifically, the commonly used sand models are:
1.Brown corundum: This is a common hard sand with high hardness and wear resistance, suitable for removing rust and oxide scale on the surface of metals such as steel, aluminum, and copper.
2.White Corundum: This is a finer, hard sand suitable for removing scale and rust from the surface of precision parts and thin steel plates without scratching or damaging the surface.
3.Garnet: This is a natural hard sand with high hardness and wear resistance, suitable for removing impurities and oxide scale from hard surfaces such as steel and ceramics.
4.Silicon carbide: This is an artificial hard sand with high hardness and wear resistance, which is suitable for removing oxide scale and impurities from high-hardness surfaces such as superalloys and stainless steel.
When choosing a sand model, it is necessary to consider comprehensively according to the actual situation. For example, for the removal of thinner oxide scale and rust, finer grains of sand can be chosen; For the removal of thicker oxide scales and impurities, coarser grains of sand can be chosen. At the same time, it is also necessary to consider factors such as the hardness, wear resistance, and cost of sand grains.
In addition, in order to get a better sandblasting effect and surface quality, the following points need to be noted:
1.Before sandblasting, the surface needs to be pre-treated, such as cleaning, degreasing, rusting, etc., to improve the sandblasting effect and surface quality.
2.When blasting, it is necessary to control the spraying angle, spraying pressure, spraying distance and other parameters to ensure that the sand particles can effectively remove surface impurities and oxide scale.
3.After sandblasting, the surface needs to be post-treated, such as cleaning, dust removal, painting, etc., to ensure the surface quality and aesthetics.
In short, choosing the right sand type is a very important part of the sandblasting process. It is necessary to consider comprehensively according to the actual situation and select the appropriate sand type and specification to ensure the sandblasting effect and surface quality. At the same time, attention needs to be paid to controlling operating parameters and post-processing to improve surface quality and aesthetics.