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Thomas Jellinghaus

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Surface finishing

Surface finishing at FACO Metalltechnik

We offer you the most diverse types of surface refinement. Be it to improve the appearance of the products, to increase the durability under weathering or to reduce wear and tear under mechanical stress.

Surface finishing by FACO and our partners means: No additional ways, costs, delivery times.
Everything from one source! We organize it for you!

[Translate to Englisch:] Pulverbeschichtung bei FACO Metalltechnik

Powder coating

In powder coating electrostatically charged plastic powder is sprayed onto workpieces of electrically conductive metals such as steel and aluminum. By subsequent heating in the oven, the powder melts and cross-links into a durable and decorative surface.
In combination with galvanised sheet metal or aluminium, with appropriate pre-treatment, powder coating is also suitable for outdoor use.

[Translate to Englisch:] Eloxierte Lochbleche aus Aluminium

Aluminium anodizing

As a further surface refinement for aluminium, we offer you anodising.

The anodising process stands for the electrolytic oxidation of aluminium and is a process for the surface treatment of aluminium. During anodising, anodic oxidation is used to create an oxidic protective layer on the metal. In contrast to galvanising, no protective layer is applied here, but an oxide layer is formed by the transformation of the metal surface. This layer is firmly bonded to the aluminium, as it is formed from the metal itself.

The oxide layer formed by the aluminium itself is very thin at a few nm. Anodizing creates a layer with a thickness of 5-25 µm, which ensures better corrosion protection.

Anodizing is also called passivation, because the corrosion of the metal is slowed down or completely prevented.
With this process, aluminum can be colored in the desired color and protected by a hard, wear-resistant layer.

[Translate to Englisch:] Feuerverzinktes Lochblech aus Stahl

Hot dip galvanizing of steel

In order to protect steel sheets or steel constructions from corrosion (rust) in the area of outdoor weathering, we offer hot-dip galvanizing.
In hot-dip galvanizing, a metallic zinc coating with a layer thickness of 35µm to 85µm, depending on the material thickness, is applied by dipping it into the bath of zinc. The temperature of the liquid zinc is approx. 450 °C.

Especially with perforated plates and expanded metal, care should be taken that the openings of the holes or meshes are not too small in order to avoid the formation of zinc plumes or even the closing of the holes by cooling zinc liquid. Ideally, the openings should be larger than 10 mm.
The surface of the sheets can be rough and grainy during hot-dip galvanizing after treatment. Since the sheets can warp due to the high temperature, the finished galvanized perforated sheets or grids are straightened once more after returning from the galvanizing plant before they are packed for shipment.

[Translate to Englisch:] Galvanisch verzinktes Wellengitter

Electro galvanizing

Electrogalvanizing provides corrosion protection, but can also be used to improve the appearance of components (decorative galvanizing).

In contrast to hot-dip galvanizing, the sheet is not immersed in a molten zinc bath but in a zinc electrolyte. In this case, the workpiece is the cathode, the anode is an electrode made of the purest possible zinc.
Due to the significantly lower layer thickness of only 3µm to 20µm, electrogalvanizing is not an option as protection for parts in outdoor use (outdoor weathering).
However, there are advantages when galvanizing sheets with finer perforations. The holes do not clog. Another advantage is that the sheets or grids do not warp due to the low temperature of the electrolyte of 20°C to 60°C!

[Translate to Englisch:] Elektrolytisch poliertes Lochblech

Electrolytic polishing

Electrolytic polishing or electropolishing (also known as electropolishing) is an ablative manufacturing process. The electrochemical process is used for smoothing (by removing) components. In an electrolyte specially adapted to the material, the workpiece to be polished is switched as the anode with the addition of an external current source and material is removed from the surface free of mechanical stress. The material is removed over the entire component. The roughness is reduced and at the same time micro cracks and local stresses are eliminated. As the prominent peaks and burrs of the surface structure are preferably levelled or corners and edges are more strongly removed, the overall surface roughness can be reduced by the process. The result is a smooth, shiny surface. Electropolishing is effective in the micro range, while the structure and shape are retained in the macro range. Electrolytic polishing places no mechanical or thermal stress on the workpiece. The process is suitable for stainless steels with small amounts of non-metallic inclusions as well as steels, brass, aluminium or copper.

[Translate to Englisch:] Gebeiztes und passiviertes Werkstück aus Edelstahl

Pickling and passivating

Pickling of stainless steel is used for corrosion resistance of non-rusting steels, because even stainless steel in untreated form can rust after welding or mechanical processing.

Pickling is a surface treatment with the aid of chemicals, such as acid or lye. The aim of the process is to change the outer layer of the material and thus improve its corrosion resistance.
Pickling is always necessary when the optimum surface condition for corrosion resistance is no longer ensured, e.g. due to: Formation of tarnish due to welding or grinding, residues of weld spatter or also deposits of metal oxides.
After the previous pickling process, the stainless steel parts are provided with a passivation layer. This layer serves as corrosion protection for the stainless steel.