Surface oxide development on aluminum alloy 6063 during heat treatment

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We report on the influence of oxygen partial pressure for the development of surface oxides covering the industrial aluminum alloy standard 6063 at temperatures ranging from room temperature to 500° C. Using an array of synchrotron-based techniques, we followed the change in oxide thickness, chemical composition, and the lateral distribution of alloying elements. The impact of the oxygen chemical potential is most visible at high temperatures where the oxide composition changes from mostly Al based to mostly Mg based. This is in stark contrast to the ultra-high vacuum (UHV) conditions where only a partial compositional transition is observed. The microscopy data demonstrate that in the UHV case, Mg segregation onto the surface occurs firstly at grain boundaries at 300° C and secondly at sites over the entire surface at 400° C. Further, the initial oxide thickness is 45 Å, as determined by XPS and XRR, decreases in all observed cases after heating to 300° C. At higher temperatures, however, the oxygen partial pressure highly influences the resulting oxide thickness as evident from our X-ray reflectivity data.


Enheter & grupper
Externa organisationer
  • German Electron Synchrotron (DESY)
  • Hydro Extruded Solutions AB

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Metallurgi och metalliska material


TidskriftSurface and Interface Analysis
StatusE-pub ahead of print - 2019 feb 20
Peer review utfördJa