Posner, R.; Fink, N.; Giza, G.; Grundmeier, G.: Corrosive delamination and ion transport along stretch-formed thin conversion films on galvanized steel. Surface and Coatings Technology 253, pp. 227 - 233 (2014)
Sarfraz, A.; Posner, R.; Lange, M. M.; Lill, K. A.; Erbe, A.: Role of intermetallics and copper in the deposition of ZrO2-based conversion coatings on AA6014. Journal of the Electrochemical Society 161 (12), pp. C509 - C516 (2014)
Posner, R.; Fink, N.; Wolpers, M.; Grundmeier, G.: Electrochemical electrolyte spreading studies of the protective properties of ultra-thin films on zinc galvanized steel. Surface and Coatings Technology 228, pp. 286 - 295 (2013)
Posner, R.; Jubb, A. M.; Frankel, G. S.; Stratmann, M.; Allen, H. C.: Simultaneous in-situ Kelvin Probe and Raman spectroscopy analysis of electrode potentials and molecular structures at polymer covered salt layers on steel. Electrochimica Acta 83, pp. 327 - 334 (2012)
Posner, R.; Sundell, P. E.; Bergman, T.; Roose, P.; Heylen, M.; Grundmeier, G.; Keil, P.: UV-Curable Polyester Acrylate Coatings: Barrier Properties and Ion Transport Kinetics Along Polymer/Metal Interfaces. Journal of the Electrochemical Society 158 (6), pp. C185 - C193 (2011)
Posner, R.; Santa, M.; Grundmeier, G.: Wet- and Corrosive De-Adhesion Processes of Water-Borne Epoxy Film Coated Steel I. Interface Potentials and Characteristics of Ion Transport Processes. Journal of the Electrochemical Society 158 (3), pp. C29 - C35 (2011)
Santa, M.; Posner, R.; Grundmeier, G.: Wet- and Corrosive De-Adhesion Processes of Water-Borne Epoxy Film Coated Steel II. The Influence of -Glycidoxypropyltrimethoxysilane as an Adhesion Promoting Additive. Journal of the Electrochemical Society 158 (3), pp. C36 - C41 (2011)
Grundmeier, G.; Posner, R.: Disbonding processes at polymer-metal interfaces: From a molecular-level understanding to self-healing processes. Galvanotechnik 101 (6), pp. 1253 - 1255 (2010)
Posner, R.; Giza, G.; Marazita, M.; Grundmeier, G.: Ion transport processes at polymer/oxide/metal interfaces under varying corrosive conditions. Corrosion Science 52 (5), pp. 1838 - 1846 (2010)
Posner, R.; Marazita, M.; Amthor, S.; Roschmann, K. J.; Grundmeier, G.: Influence of interface chemistry and network density on interfacial ion transport kinetics for styrene/acrylate copolymer coated zinc and iron substrates. Corrosion Science 52 (3), pp. 754 - 760 (2010)
Posner, R.; Wapner, K.; Amthor, S.; Roschmann, K. J.; Grundmeier, G.: Electrochemical investigation of the coating/substrate interface stability for styrene/acrylate copolymer films applied on iron. Corrosion Science 52 (1), pp. 37 - 44 (2010)
Santa, M.; Posner, R.; Grundmeier, G.: In-situ study of the deterioration of thiazole/gold and thiazole/silver interfaces during interfacial ion transport processes. Journal of Electroanalytical Chemistry 643 (1-2), pp. 94 - 101 (2010)
Posner, R.; Titz, T.; Wapner, K.; Stratmann, M.; Grundmeier, G.: Transport processes of hydrated ions at polymer/oxide/metal interfaces. Part 2: Transport on oxide covered iron and zinc surfaces. Electrochimica Acta 54 (33), pp. 900 - 908 (2009)
Posner, R.; Wapner, K.; Stratmann, M.; Grundmeier, G.: Transport processes of hydrated ions on oxide covered iron and zinc surfaces and interfaces. Part 1: Transport at polymer/oxide/metal interfaces. Electrochimica Acta 54 (3), pp. 891 - 899 (2009)
Wielant, J.; Posner, R.; Grundmeier, G.; Terryn, H.: Interface dipoles observed after adsorption of model compounds on iron oxide films: Effect of organic functionality and oxide surface chemistry. Journal of Physical Chemistry C 112, pp. 12951 - 12957 (2008)
Hydrogen in aluminium can cause embrittlement and critical failure. However, the behaviour of hydrogen in aluminium was not yet understood. Scientists at the Max-Planck-Institut für Eisenforschung were able to locate hydrogen inside aluminium’s microstructure and designed strategies to trap the hydrogen atoms inside the microstructure. This can…
We will investigate the electrothermomechanical response of individual metallic nanowires as a function of microstructural interfaces from the growth processes. This will be accomplished using in situ SEM 4-point probe-based electrical resistivity measurements and 2-point probe-based impedance measurements, as a function of mechanical strain and…
Hydrogen induced embrittlement of metals is one of the long standing unresolved problems in Materials Science. A hierarchical multiscale approach is used to investigate the underlying atomistic mechanisms.
For understanding the underlying hydrogen embrittlement mechanism in transformation-induced plasticity steels, the process of damage evolution in a model austenite/martensite dual-phase microstructure following hydrogenation was investigated through multi-scale electron channelling contrast imaging and in situ optical microscopy.
This project will aim at developing MEMS based nanoforce sensors with capacitive sensing capabilities. The nanoforce sensors will be further incorporated with in situ SEM and TEM small scale testing systems, for allowing simultaneous visualization of the deformation process during mechanical tests
The project aims to study corrosion, a detrimental process with an enormous impact on global economy, by combining denstiy-functional theory calculations with thermodynamic concepts.
Hydrogen embrittlement affects high-strength ferrite/martensite dual-phase (DP) steels. The associated micromechanisms which lead to failure have not been fully clarified yet. Here we present a quantitative micromechanical analysis of the microstructural damage phenomena in a model DP steel in the presence of hydrogen.
Thermo-chemo-mechanical interactions due to thermally activated and/or mechanically induced processes govern the constitutive behaviour of metallic alloys during production and in service. Understanding these mechanisms and their influence on the material behaviour is of very high relevance for designing new alloys and corresponding…
Nickel-based alloys are a particularly interesting class of materials due to their specific properties such as high-temperature strength, low-temperature ductility and toughness, oxidation resistance, hot-corrosion resistance, and weldability, becoming potential candidates for high-performance components that require corrosion resistance and good…
Understanding hydrogen-assisted embrittlement of advanced structural materials is essential for enabling future hydrogen-based energy industries. A crucially important phenomenon in this context is the delayed fracture in high-strength structural materials. Factors affecting the hydrogen embrittlement are the hydrogen content,...