2.2.9 Wet blasting for fine surface treatment

Nowadays modern methods on fine surface treatment like e.g. liquid honing, smooth blasting, polishing blasting, etc. base only partially on the further development of the well-known wet blasting systems operating on the basis of a water-abrasive mixture.

The application of abrasives of good quality, at very fine and also precisely calibrated granularity is of utmost importance to be able to reach the required fineness of surface treatment.

This method aims at reducing the originally existing surface irregularities and to achieve the required low roughness height. When selecting the grain size to be used for this method not only the desired surface roughness will be decisive, but the existing roughness height of the surface of the workpiece not yet being treated has to be taken into account as well.

In addition, the inclination angle under which the jet impinges on the surface of the workpiece influences essentially the blasting result. The abrasive grains for blasting have to have, on the one hand, enough kinetic energy, but, on the other hand, the horizontal component of the impact speed must be high enough to get such an efficiently chip removing effect.