Abrasive cleaning is used in order to remove scale, rust, oxide films, soot. There is also a comprehensive wet/dry blasting technology offered by duoblast.co.uk.
Abrasive cleaning is carried out with the help of particles of abrasive material, which are fed to the surface at high speed in a jet of compressed air or due to the action of centrifugal forces. Abrasive particles, hitting the surface, chip off small pieces of metal from it along with scale, rust, oxide films and other contaminants. This technology provides high quality cleaning of almost all contaminants. Abrasive cleaning creates a uniform roughness, and this helps to increase the adhesion of the coating.
The choice of abrasive depends on the shape and size of the products being processed, as well as on their material and the type of contamination being removed. Metal sand (shot) should consist of the same material or a material similar in electrochemical characteristics to the material of the surface to be cleaned. Otherwise, abrasive particles remaining on the surface may cause premature appearance of corrosion foci under the coating layer. After surface treatment with any abrasive materials, it must be blown with purified air.
Metal sand, cast or cast iron shot, steel chipped or cast chopped steel with a size of 0.3; 0.5; 0.8 millimeters and more are used for shot blasting of ferrous metal surfaces. In case of incorrect selection of abrasive material can lead to a large roughness, which will be difficult to smooth out with a coating layer.