Effective corrosion protection through zinc thermal diffusion

Significantly extend the service life of metallic components through effective corrosion protection from Thermission.

Metals are among the most popular materials thanks to their versatile design options and comparatively low price. However, these benefits can be dashed very quickly without appropriate corrosion protection. Corrosion causes billions in damages every year since defective components must be repaired or replaced, which in turn translates to costly machine and system downtimes. Take advantage of the effective corrosion protection from Thermission and extend the service life of your metallic components many times over.

Undoubtedly better corrosion protection through zinc thermal diffusion

Salt spray tests confirm that, compared to today’s known methods, thermal diffusion using Thermission’s systems helps extend the service life of metallic components significantly. In applications with additional requirements for the corrosion protection, thermal diffusion presents an excellent basis for additional protection thanks to the resulting rough surface and leaves nothing in the way of subsequent passivation or application of a sealer or top coat.

This allows for significant reduction of downtimes and repair costs as well as considerable extension of warranty periods and maintenance intervals.

No hydrogen embrittlement

The dry thermal diffusion process rules out the risk of hydrogen embrittlement in the coating. The thermal diffusion process can also help with hydrogen removal in cases where the hydrogen has already penetrated the material.

No contact corrosion

The so-called contact corrosion can occur if two or more steels with different corrosion potential are joined together and exposed to an electrolyte. Here, the less refined metal protects the more refined metal by “sacrificing” itself and corroding. For instance, it is often necessary to use so-called separating elements where different steels with different material properties (e.g., toughness or hardness grades) are combined in lightweight construction. Zinc thermal diffusion helps avoid such separating elements through coating of all overlapping steels with a 4-25 µm thick thermal diffusion layer. This ensures that all components have the same corrosion potential, which in turn prevents contact corrosion.

Threadability and accuracy of fit

Most fasteners with internal or external threads are subject to standards that define the exact geometrical properties. Likewise, shafts, axles, and many other workpieces are subject to clearly standardized fits. Great care must therefore be taken during the coating process to ensure that the applied layer is not too thick and, for example, impairs the threadability or turns a clearance fit into a press fit. In such cases, zinc thermal diffusion is a perfect choice and guarantees a uniform coating on the thread base and thread crest with a layer thickness of only 4-25 µm.

Would you like to know more about zinc thermal diffusion?

Simply have a look at our "Think Zinc" beginner’s guide to learn more about Thermission’s system technology. Our experts will be happy to advise you personally.


For individual questions and consultation feel free to contact our experts.