Abrasive blast cleaning can be defined as a method of surface preparation that involves the coarse particles being forced by compressed air or water jets. Due to the impact that the particles make with the surface, the effects of cleaning, roughening, and activation is produced. People are advised t take into consideration the hardness of the materials since they will remove any contaminants that are found on the surface, leaving the surface deep and rough. The size of the particles is also another factor to consider. If the particles are large in size are usually excessive for thin coatings because they produce a deep surface profile. On the other hand, fine particles affect the adhesions as well as the strength of the surface coating. This is because they result in a shallow profile.
The particle shape affects impacts the surface in specific ways. For instance, sharp particles create a more aggressive action, which later on forms an in-depth surface profile. If the particles are round in shape, the surface that will be created will be shallow. Wet blasting methods usually utilize the fine particles forming suspensions in water. It is also important to note that abrasive materials that are used for outdoor applications can never be re-used. Due to this reason, cheap materials, such as sand and slang, are often used. On the other hand, materials that are used in confined places such as the cabinet or a room are re-used multiple times. Because of this, expensive abrasives can be used, such as the alumina, metal shot, glass bead as well as the grit.
There are usually numerous types of abrasive particles. The silica sand, for example, is often used in outdoor applications. It is also affordable. Silica usually has a breakdown rate that is high, which causes substantial dust formation. Alumina sand is another type of abrasive particle that is hard and tough. Due to its hard nature, it usually produces low amounts of dust. There are also by-products of other sources such as coal slag, copper slag, and the nickel sang. The good thing about the slags is that if they are already crushed, they can be used as cheap disposable blasting material.
The iron grit is a chilled cast iron that has been crushed, which has been combined with moderate cost. The average cost is particles that are usually hard and sharp sharped. Therefore, when the surface gets impacted by these materials, new sharp edges are created. The steel shot is another type of abrasive material that is durable and stable at the same time. It is spherical in size. Steel shot processing is usually clean and at the same time, consistent. Glass beads are spherical and result in a smooth quality surface that does not have dimensional changes. It is crucial to note that the glass beads do not contain crystalline silica, and neither do they produce dust. If you need a gentle cleaning action, the plastic particles will suit you best. These particles will never cause damage to the substrate surface.