Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Metal Substrates I

O 59.2: Vortrag

Mittwoch, 2. April 2014, 16:15–16:30, WIL A317

Annealing of oxidized aluminium alloy surfaces studied by PEEM combined with XPS — •Lisa Rullik¹, Florian Bertram¹, Jonas Evertsson¹, Anders Mikkelsen¹, Yuran Niu², Alexei Zakharov², and Edvin Lundgren¹ — ¹Div. of Synchrotron Radiation Research, Lund University, Lund, Sweden — ²MAX-lab, Lund University, Lund, Sweden

Aluminium alloys are used in a wide range of applications due to their high tensile strength in concomitance with low density. Additionally, aluminium alloys form a native passivating oxide layer, which leads to high corrosion and weathering resistance. In industrial manufacturing, aluminium alloys acquire their desired properties upon heating and welding.

Here, we present how annealing affects the surface layer composition of different aluminium alloys. Using MEM, PEEM and XPS we were able to follow the diffusion process of aluminium and its alloying elements from and towards the surface. For temperatures up to 300^∘C only slight changes of the surface composition can be observed in PEEM images and XPS spectra. At 400^∘C a significant diffusion of magnesium to the surface occurs.