Thermally sprayed protective coatings are applied onto many mechanically stressed components such as support structures, shafts, turbine blades, and heat exchangers. In many cases, in addition to the static or dynamic loading, a superimposition with corrosion processes, e.g., high temperature corrosion or electrochemical corrosion, occurs. Within this context, it does not matter if the coating was designed for corrosion protection or wear protection, since the stresses can occur in either case.
The corrosion behaviour of arc-sprayed ZnAl-based coating systems has already been studied extensively. However, the investigation methods which were used are predominantly based on simple corrosion tests, such as salt spray tests or electrochemical corrosion measurements. With regard to the technical applications of ZnAl-based coating systems in the field of surface technology, the chemo-mechanically coupled load spectrum is considered only to a limited extent. In most cases, the mechanical loads of the components or of the coatings, which occur in real applications, including the corrosive environmental conditions, are not taken into consideration. Yet, it is to be expected that a mechanical load significantly changes the service life (fatigue) and the corrosion behaviour of the layer-substrate-system. Corrosion mechanisms such as stress or vibration crack corrosion will be of high interest. Additionally, a different electrochemical potential of the layer and the substrate can lead to accelerated corrosion. Scientifically, the extent to which the coating influences the occurring corrosion mechanisms, as well as the kind of layer-substrate interaction that takes place, are of interest.
In order to investigate these questions, in-situ corrosion fatigue tests with different polarisations are planned. For this, different ZnAl-based layer systems, varying in hardness, lamellar structure and porosity, will be developed and analysed. Furthermore, it will be investigated to which extent machine hammer peening (MHP) as a post-treatment influences the morphology and corrosion fatigue behaviour of the coating system.
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Arrival by Deutsche Bahn to Dortmund or Bochum central station.
From Dortmund central station, take the S1 city train in the direction of Düsseldorf to the "Dortmund Universität" station (7 minutes journey time).
From Bochum central station, take the S1 city train in the direction of Dortmund to the "Dortmund Universität" station (14 minutes journey time).
The city train runs regularly every 20 minutes in both directions. From the city train station, take the Skytrain (S-Universität stop) to the Campus Süd stop (1 stop, runs every 10 minutes).
From Dortmund Airport
By taxi to TU Dortmund University, Campus South (approx. 20 min and 30 €, see Map)
From Düsseldorf Airport
Take the city train S1 in the direction of Dortmund to the "Dortmund-Universität" station (approx. 60 min). From here, take the Skytrain in the direction of Campus South or Eichlinghofen (runs every 10 minutes and takes approx. 3 min.).
The H-Bahn is one of the hallmarks of TU Dortmund University. There are two stations on North Campus. One (“Dortmund Universität S”) is directly located at the suburban train stop, which connects the university directly with the city of Dortmund and the rest of the Ruhr Area. Also from this station, there are connections to the “Technologiepark” and (via South Campus) Eichlinghofen. The other station is located at the dining hall at North Campus and offers a direct connection to South Campus every five minutes.
The facilities of TU Dortmund University are spread over two campuses, the larger Campus North and the smaller Campus South. Additionally, some areas of the university are located in the adjacent “Technologiepark”.