Surface refinement

Refinement with powder coating

A negatively charged powder is applied to the positively charged aluminium surface during an electrostatic process and then fired in order to obtain a resistant and pore-tight surface. The heating process creates a strong bond between the powder and the surface, which is exceptionally robust and durable.
Adhering strictly to principles of green production, the powder coating refines the surfaces of the metals and aluminium. In addition, the powder coating protects the workpieces from environmental influences and corrosion. The surface of the materials is highly resilient to abrasion and impacts and is resistant to chemicals within certain ranges.

Unlike wet painting, the powders do not contain eco-toxic solvents.

Refinement with anodised finish

Untreated aluminium oxidises when exposed to oxygen. This surface process can be artificially induced to protect against corrosion. The resulting anodised surface is corrosion-resistant and insensitive to
wear following final compaction. Even the applied paint remains stable.

This process is suitable for a variety of solutions: from technical to decorative and hard anodising. We are able to accommodate all of these areas. The appearance of the surface in its finished state depends on the type of process, namely on the chemical and mechanical pretreatment. The layer thicknesses are 8–20 µm and can be dyed.

Simple passivation and even small parts for the automotive industry can also be offered on the customer’s request.

Caustic passivation

Caustic passivation is used to remove unwanted oxide layers from the surface of the workpiece. In doing so, it improves corrosion protection and provides an adhesive base for subsequent coatings or adhesive bonds.

The workpieces are first cleaned by removing adhering oils, greases and other contaminants. After this, the caustic agent is applied, followed by a preservative layer as passivation. A wet chemical process is used to apply the preservative layer, which is why the surface can be attached to sheets and profiles, but also to finished components.

Galvanising

Galvanising involves the application of a thin layer of zinc to a steel surface to protect it from corrosion. Usually introduced by a thermal or galvanic process, the zinc coating provides active corrosion protection.

In hot-dip galvanising, the steel is immersed in a melt of liquid zinc at a temperature of approx. 450 °C. The thickness of the zinc layer is between 5 and 150 micrometres, depending on the technology. Individually galvanised components can achieve a service life of more than 50 years due to the greater zinc layer thickness.

In contrast, the workpieces are not dipped in a zinc melt during electrogalvanising and are instead immersed in a zinc electrolyte. Here, the workpiece to be galvanised is suspended in the solution as the cathode. An electrode made of pure zinc acts as the anode. This method produces varying layer thicknesses, so the corrosion protection is usually less durable than with hot-dip galvanising. However, electrogalvanised sheet is highly suitable for subsequent powder coating due to the uniform and almost entirely even surfaces.

Which solution suits you? We are happy to help!

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