Blasting may be a kind of pre-treatment or a step in itself in the process of surface treatment.
In the blasting process particles are dissolved with the shot from the surface of the work piece and the surface is thus roughened. With this process any rests of lacquers, rusts at iron parts or others may be removed for example.
Thereby the following must be noted::
Outstanding importance is attached to the recycling of the shot. If polluted shot is used for further blasting this will result in the effect that after the blasting rests of lacquers may possibly remain on the surface as inclusions or that the blasted surfaces are covered with a light oil film.
A simple method to check the quality of the blasting work is the so-called Klebeband-Test (sticky tape test). A piece of white insulating tape is stuck to the blasted, blown down surface and then removed again. There may not be any residues on the tape.
We can carry out the following of blasting types:
- Blasting in a free blasting plant with blast furnace slag
- Blasting in a free blasting plant with iron-free shot for aluminium and premium steel
- Blasting with corundum in various blasting plants
- Blasting with glass beads in a manual blasting plant
- Blasting with any shot in a mobile plant outside our premises
Depending on the requirements the quality of the blasting is checked with a roughness measurement, for example.
We clean and degrease the component parts before blasting so that the shot is not polluted with fats and oils. Our shot is automatically cleaned from debris in the respective plants so that only clean shot may be used. As a rule, we only blast with oil-free and dry compressed air.
Only this guarantees a qualitatively impeccable blasting.
After blasting an immediate processing of the component part is necessary as otherwise the blasted surface, which is metallically blank begins to corrode again.
Lacquering, powder or wet lacquer, on a surface which has only been blasted is not reasonable as there is practically no protection against sub-surface migration.