Selective coating with SELGA-COAT®
SELGA-COAT® is a selective plating process for metal surfaces. Areas that do not require plating are covered inside a tool with a built-in sealing system. After that, an electrolyte is pumped into the tool housing. It flows around the area to be coated to galvanize it. When aluminum alloys are finished with hard anodizing processes, the workpiece is used as the anode.
Fields of application of SELGA-COAT®
When used as industrial coating, SELGA-COAT® is primarily applied in the automotive and mechanical engineering sectors. On the one hand, this is due to the fact that components are produced in large quantities, and on the other hand, the requirements placed on the coatings are extremely demanding. This selective hard anodizing process has proven highly effective for vehicle components. Within the scope of large-scale orders, Aalberts surface treatment has successfully coated braking systems, gearbox components, (diesel and gasoline) motor pistons, pump housings (servo-steering), wheel hubs and bearings, valves (e.g. injection pumps), valve pistons (automatic transmission) and spacer plates (automatic transmission).
When it comes to the selective deposition of gold, the component surface is used as the cathode. The SELGA-COAT® GOLD layers created in this way are characterized by high ductility, resistance to tarnishing and good solderability. Their low, specific electrical resistance offers further advantages.
SELGA-COAT® GOLD coatings are very much sought after when it comes to contact components. Using our process, the contact areas in your electrical devices can be reliably connected by a gold layer. Our targeted partial coatings minimize the consumption of gold, and thus your costs.
Selective coating with LASOX-COAT®
LASOX-COAT® is a selective coating process involving the laser-induced formation of aluminum oxide. When exposed to laser radiation, the alloy particles on the surface of the component to be processed melt and vaporize. Oxygen plasma and part of the molten aluminum react to form aluminum oxide (corundum, Al2O3), which now covers the treated surface. Underneath the corundum layer there is a remelt zone whose thickness is approximately 10 times greater.
Since the laser beam is guided across the workpiece surface section by section, the coating duration is proportionate to the area to be coated. Using this selective coating process, we can also create letterings, individual lines or complex shapes and patterns.
Optimisation of frictional processes by means of specially structured metal surfaces
Zinc flake coating
Powerful corrosion protection - no hydrogen embrittlement
Colourful surface protection