We regularly outsource specialised post-treatments to our suppliers.
Some examples of treatments we regularly outsource:
We use this quite often for electronics: fronts, back plates and panelling are fitted with text or images. Screen printing can be applied on practically any material, surface or dimensions. The inks used ensure a quality, wear-resistant screen-print on the sheet material. It is even possible to screen-print in full colour.
Pad printing is a stamping technique which can be used to apply text or symbols to almost any product that is not flat. This way, even sunken connector panels can be fitted with printed images.
This is a cleaning technique for stainless steel in which the oxides are removed using acid. Oxides cause rust or corrosion. Oxides are created by rolling, sanding or grinding stainless steel. Pickling stainless steel sheets makes the stainless steel even more resistant to rust. Subsequent passivisation fully restores the protective oxide layer with oxygen.
Electropolishing (a.k.a. electrochemical polishing) is an electrochemical process in which material is removed from a metal workpiece. It is used to polish surfaces (make them smoother). Electropolishing is carried out by placing the workpiece in a bath of electrolyte (in a bath of a conductive liquid). An electrical voltage is applied between the cathodes and the anodic workpiece. The voltage forces the metal ions on the surface of the workpiece to move to the cathodes. This eliminates irregularities on the surface, making it smoother.
Here, a layer of zinc is applied to the sheet to protect it from rust. It is applied using electrolysis, i.e. in a bath of a conductive liquid. An electrical voltage is applied between the cathodes and the anodic workpiece. The voltage forces the zinc ions to deposit onto the surface of the sheet. The thickness of the layer can be precision calibrated by varying the voltage difference. This process is also called galvanisation.
Anodising is a surface treatment to provide metals such as aluminium or titanium with an oxide layer. Anodising is carried out by means of an electrolysis process. The oxide layer is hard, porous and hard-wearing. Afterwards, any pores can be sealed to improve corrosion-resistance. Various electrolytes can be used to perform the anodising process. An electrolyte and treatment type will be selected depending on what material is to be anodised and the desired properties of the anodising layer. Aluminium can also be provided with a wear-resistant colour.
White chromating is often used in the electronics sector on account of its good adhesion and corrosion-resistance, and to minimise contact resistance. Because of its high electrical conductivity, it acts as an EMC (ElectroMagnetic Compatibility) protection.
Chromating is a chemical treatment on a metal surface which creates a layer of chromium. White chromating on galvanised steel is carried out by the action of diluted chromic acid + nitric acid on the zinc layer.
With chasing, a thin layer of material is removed from the sheet in order to create an image or text. Chasing can be performed with a mill or laser.
This is also called EPD treatment. EPD is an electrostatic painting process in which the part being painted is submersed in a liquid bath. A plus pole, a minus pole and the product to be painted are placed in a bath filled with a water-based electrophoretic paint. A direct current is used to deposit the paint particles onto the product and create a coat of paint on the surface. This coat of paint accumulates until a sealed and insulating coating is formed around the product. This makes it possible to coat hard-to-reach places with paint. This coat of paint will be 15 to 20μm thick. After electrostatic application of the paint, it is dried and cured in a furnace at 180 to 200ºC. The part being painted is often phosphated as a pretreatment before the EPD process. This enhances the adherence of the electrophoretic paint. The EPD process offers a high degree of corrosion-resistance in combination with zinc phosphate coating.