Surface preparation for coatings and other technological operations

Surface preparation consist in making micro- or macrorelief in form of fins or pinfins. DC obtained reliefs has the property of forming a locking connection with the applied coating or glue. Adhesive bond is supplemented by a mechanical anchoring connection.

Fig. 1 - Ceramic (Al2O3) coating on steel	Fig. 2 - Tungsten carbide coating on steel shaft	Fig. 3 - Polymeric Repair Composite with ceramic ("Belzona") between fins

Fig. 4 - Tungsten carbide between fins	Fig. 5 - Cohesionless polymer (Teflon, Ultra-high molecular weight polyethylene etc) prepared for gluing