Details
| Original language | English |
|---|---|
| Pages (from-to) | 1288-1297 |
| Number of pages | 10 |
| Journal | Surface and interface analysis |
| Volume | 51 |
| Issue number | 12 |
| Publication status | Published - 7 Nov 2019 |
Abstract
This study analyses the evolution of surface characteristics of two industrial high-strength 7xxx aluminium alloys with a focus on alloy composition and environmental parameters. Based on storage and transport conditions of as-machined products, the effect of humidity—as liquid and vapour phase—on the natural oxide layer has been studied. The evolution of the natural oxide layer has been analysed by scanning electron microscopy and X-ray photoelectron spectroscopy. The growth behaviour of the surface layer is dominated by environmental conditions, while microgalvanic activity depends mainly on the alloys' chemical composition and differs significantly for tested alloys. Scanning transmission electron microscopy images demonstrated that the long-term exposure at moderate temperatures affects the microstructure near the surface, which differs for the analysed alloy compositions. An anomalous precipitation of zinc-rich particles at the surface and along the precipitate-free zone is observed for the alloy with higher Zn/Mg ratio and lower Cu content.
Keywords
- 7xxx aluminium alloys, environment, humidity, microstructure, passive layer, SEM, STEM, XPS
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Physics and Astronomy(all)
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Materials Chemistry
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In: Surface and interface analysis, Vol. 51, No. 12, 07.11.2019, p. 1288-1297.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Evolution of surface characteristics of two industrial 7xxx aluminium alloys exposed to humidity at moderate temperature
AU - Schwarzenböck, Elisabeth
AU - Hack, Theo
AU - Kolb, Max
AU - Engel, Christian
AU - Heidenblut, Torsten
AU - Maier, Hans Jürgen
PY - 2019/11/7
Y1 - 2019/11/7
N2 - This study analyses the evolution of surface characteristics of two industrial high-strength 7xxx aluminium alloys with a focus on alloy composition and environmental parameters. Based on storage and transport conditions of as-machined products, the effect of humidity—as liquid and vapour phase—on the natural oxide layer has been studied. The evolution of the natural oxide layer has been analysed by scanning electron microscopy and X-ray photoelectron spectroscopy. The growth behaviour of the surface layer is dominated by environmental conditions, while microgalvanic activity depends mainly on the alloys' chemical composition and differs significantly for tested alloys. Scanning transmission electron microscopy images demonstrated that the long-term exposure at moderate temperatures affects the microstructure near the surface, which differs for the analysed alloy compositions. An anomalous precipitation of zinc-rich particles at the surface and along the precipitate-free zone is observed for the alloy with higher Zn/Mg ratio and lower Cu content.
AB - This study analyses the evolution of surface characteristics of two industrial high-strength 7xxx aluminium alloys with a focus on alloy composition and environmental parameters. Based on storage and transport conditions of as-machined products, the effect of humidity—as liquid and vapour phase—on the natural oxide layer has been studied. The evolution of the natural oxide layer has been analysed by scanning electron microscopy and X-ray photoelectron spectroscopy. The growth behaviour of the surface layer is dominated by environmental conditions, while microgalvanic activity depends mainly on the alloys' chemical composition and differs significantly for tested alloys. Scanning transmission electron microscopy images demonstrated that the long-term exposure at moderate temperatures affects the microstructure near the surface, which differs for the analysed alloy compositions. An anomalous precipitation of zinc-rich particles at the surface and along the precipitate-free zone is observed for the alloy with higher Zn/Mg ratio and lower Cu content.
KW - 7xxx aluminium alloys
KW - environment
KW - humidity
KW - microstructure
KW - passive layer
KW - SEM
KW - STEM
KW - XPS
UR - http://www.scopus.com/inward/record.url?scp=85065540171&partnerID=8YFLogxK
U2 - 10.1002/sia.6652
DO - 10.1002/sia.6652
M3 - Article
AN - SCOPUS:85065540171
VL - 51
SP - 1288
EP - 1297
JO - Surface and interface analysis
JF - Surface and interface analysis
SN - 0142-2421
IS - 12
ER -