Improved corrosion protection of the cut edge of coil coated sheet

Coil coating is a process to apply organic coatings to sheet metal directly after the rolling process and before any further subsequent processing. Coil coated sheet metal has found a broad variety of applications in certain areas of the sheet metal industry, e.g. for household article casings or façade planking of buildings. However, the use of these materials is limited for a large extent of applications by its liability to corrosion of the bare cut edge which is not covered and thereby not protected by paint. A possible approach to this problem is to develop a procedure that can improve corrosion protection by the cutting process. By letting some of the surface coating flow into the cutting clearance and cover the bare cut edge, corrosion resistance can be enhanced. A different approach is to apply a corrosion inhibiting medium, e.g. UV-curing lacquer, onto the cut edge corrosion resistance can be significantly improved. To minimize process steps, this application can be integrated into the cutting process.