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Professional pre-treatment of surfaces
for long-lasting component quality

The quality of the bond between rubber and metal or plastic is crucial for the performance and service life of the end product. For optimum results and a long-lasting bond, thorough cleaning, activation and individual pre-treatment of the surface is necessary before the adhesive coating. Residues or impurities reduce the adhesion of the subsequent coating and impair component quality and overall performance.

Thanks to our decades of experience and our high quality standards, we know how important it is to match the type of pre-treatment to the base material, the condition and degree of soiling on delivery and the requirements of the end product. This is how we create the decisive conditions for the subsequent coating process.

Surface cleaning

Im ersten Schritt erfolgt in der Regel eine gründliche Reinigung derRohteile um beispielsweise Fette und Ölrückstände, die bei der Produktion entstanden sind, restlos zu entfernen. The most suitable method depends, among other things, on the material and the extent of the soiling. To the g ängigen Verfahren zählen die Entfettung mit Perchlordampf und die alkalische Reinigung.

Degreasing with perchloric steam

In this process, a special solvent is heated until it reaches the boiling point and evaporates. The hot solvent vapor condenses on the substrate surface, dissolves the grease and rinses it off with virtually no residue. This process is particularly suitable for sensitive raw parts and enables the highest degree of purity in our degreasing processes. In addition, the process of degreasing with perchlorine vapor is considered safe and low-emission, as it is a closed system and therefore no solvents are released into the atmosphere.

Alkaline cleaning

In this process, the parts are cleaned in a hot water solution, sometimes under very high pressure. The high temperatures cause the grease to "saponify" and the water can dissolve the grease from the surface in this way.

Blasting

Pre-treatment by blasting is used to clean, enlarge and roughen the surface of metals and plastics. Impurities are removed and the surface roughened by the solid blasting medium hitting the surface at high speed (approx. 80 m/s). While the parts are in the blasting system, they are constantly circulated so that all surfaces are treated evenly. The surface roughness created by blasting is a prerequisite for further coating processes. The blasting media are matched to the application; corundum, steel grit or stainless steel grit are used, for example.

Phosphating

Phosphating is a pre-treatment process in which a conversion layer is created on metallic surfaces through chemical reactions. The process often takes place in rotating drums with bulk material and is used for corrosion protection, infiltration protection and adhesion promotion. There are different methods of phosphating: ZnCa-Phos, ZN-Phos and FE-Phos.

Zinc-nickel coating

The galvanic zinc-nickel (Zn-Ni) process is characterized by very good corrosion protection and is preferably used in the automotive industry for components with high corrosion requirements in the engine compartment, chassis or on brakes. The basis for a high-quality zinc-nickel
coating is chemical cleaning by degreasing, pickling and activating the surface. This is followed by the electrolytic zinc-nickel coating process in rack or barrel systems, before post-treatment, passivation or sealing, including drying, complete the process.

Special processes

The Bonderite process enables complete coating of cavities, edges and the smallest gaps, as it works on a chemical basis and therefore does not produce a "Faraday effect". In addition, the low coating temperature ensures complete dimensional stability.
Satin finishing produces an even, matt surface. The multi-stage sanding process creates a so-called "line pattern" without changing the geometric shape of the workpiece.

Surface activation

The next step in the pre-treatment process is to activate the surface in preparation for further coating processes. A distinction is made between layer-forming (phosphating, zinc-nickel, bonderite) and non-layer-forming processes (blasting, satinizing). Both processes structure the surface and roughen it.

GOTEC - Experienced specialist for pre-treatment
to the highest quality standards

The requirements for surfaces are diverse. Depending on the area of application and base material, different pre-treatments may be necessary. Thanks to decades of experience, we can draw on in-depth expertise and are familiar with the requirements of many applications and industries. Standardized processes, state-of-the-art technologies and a high degree of automation allow us to offer the highest quality at the best price-performance ratio.

Performance

Deep cleaning and activation of the surface is essential for the performance of the final product.

Quality

Only professional pretreatment guarantees a long-lasting bond between rubber and metal/plastic.

Sustainability

We use the most environmentally friendly products and processes with low energy consumption.