Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Focus Session: Frontiers in Reducible Oxide Surface Science II
O 18.6: Vortrag
Montag, 12. März 2018, 17:00–17:15, HE 101
Improving Adhesion at weakly-interacting metal/oxide interfaces — Ha-Linh T. Le1, •Jacek Goniakowski1, Claudine Noguera1, Alexey Koltsov2, and Jean-Michel Mataigne2 — 1Institut des Nanosciences de Paris, CNRS, 75005 Paris — 2ArcelorMittal Maizières Research, 57280, Maizières lès Metz
The control of adhesion at metal/oxide interfaces is of a key importance for a large variety of applications, involving either 2D or 3D metal deposits on oxide substrates. More recently it has also been addressed in the context of anti-corrosive zinc coating of advanced high strength steels. Indeed, selective oxidation and surface segregation of strengthening elements, such as Al, may lead to a formation of an oxide film on the steel surface which dramatically reduces zinc adhesion.
In this context, we report a thorough ab initio and Monte Carlo study of adhesion at a zinc/alpha-alumina(0001) interface. We find that the interaction of zinc with bare non-polar terminations of alumina is indeed weak but that it can be improved by either surface pre-hydroxylation or by metallic buffers. While the performance of single-component buffers may degrade upon oxidation, that of realistic multi-component ones (e.g. stainless steel) remain satisfactory under a large span of oxidizing conditions due to the separation of metal and oxide components in the buffer and the suppression of the weak oxide/zinc and moderately strong alumina/metal interfaces. More generally, thanks to the possibility of selective oxidation and component segregation, multi-component buffers appear as promising solutions for improving adhesion at weakly interacting metal/oxide interfaces.