Alloy
Cast aluminium alloys are not suitable for pre-treatment due to their metal additives such as Cu, Zn, PB etc., as these “foreign metals” tend to deposit on the surface during the pre-treatment process so that powder coating adhesion is greatly reduced. According to DIN 1725, however, there are also alloys suitable for corresponding applications.
Construction
It should be noted that fixing points are required to secure the parts. Primarily these are contact surfaces or most frequently holes. Depending on size and geometry, the dimensional stability of sheets and edge parts with a material thickness of less than 2.5 mm or of unstable profiles may be impaired. It should also be noted that the powder coating produces a very high edge coverage. In such areas, the paint layer can exceed 200 µm. If necessary, this should be taken into account for a later assembly. Cavities or structurally designed scooping areas must be provided with drain holes so that, as in galvanising, the chemicals can run off freely and do not lead to subsequent surface defects.
Colour and surface
There are different qualities of powder coating. Check which requirement you really need. These can be completely different for facades, interior design or the automotive sector, for example. The processing of uniformly brilliant metallic facades also poses a great challenge for paint manufacturers and coaters time and again. If you have a special requirement, ask us – we will advise and support you in the technical clarification!