WEB Durable PEO surfaces on Al casting alloys
A special attention should be paid on the optimization of the tribological behavior in the combustion engine system by decreasing the friction and wear losses to achieve an environmental shielding, since 60 % of all automobiles will be still equipped with a combustion engine in 2040 , whereas enhanced motor fuels and a mixture of the power train will play an important role.
This study deals with nanocrystalline, hard and dense PEO surfaces (plasma electrolytical oxidation) on casting Aluminum alloys with high Si content, which results in very wear-resistant surfaces. By adjustable topography and morphology of these surfaces using the ultraceramic® process, positive frictional conditions in the tribological contact can be achieved and especially the wear of the tribological partner can be reduced. The impact of different oils and their influence on friction and wear are elucidated by testing with different velocities and loads in a pin-on-disc setup, whereas the findings are correlated with wear mechanisms by using extensive SEM and EDX analysis.
Promising results are achieved by testing with novel low viscosity oil, which is developed for innovative engine applications: Here, a significant reduction of the wear on coating and counter body side could be shown under different testing conditions.
 Deutsches Zentrum für Luft- und Raumfahrt, Aral AG, Tankstelle der Zukunft 2019