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Zander, Daniela
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Publications (7/7 displayed)
- 2024Effect of wire drawing and heat treatment on the exfoliation corrosion mechanism of Al-Zn-Mg-Zr-V wires
- 2023Preheating Influence on the Precipitation Microstructure, Mechanical and Corrosive Properties of Additively Built Al–Cu–Li Alloy Contrasted with Conventional (T83) Alloycitations
- 2023Laves phases in Mg-Al-Ca alloys and their effect on mechanical properties
- 2022Revisiting the tolerance limit of Fe impurity in biodegradable magnesiumcitations
- 2021Opportunities of combinatorial thin film materials design for the sustainable development of magnesium-based alloyscitations
- 2021The Effect of Chemistry and 3D Microstructural Architecture on Corrosion of Biodegradable Mg–Ca–Zn Alloyscitations
- 2021Influence of the amount of intermetallics on the degradation of Mg-Nd alloys under physiological conditionscitations
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document
Effect of wire drawing and heat treatment on the exfoliation corrosion mechanism of Al-Zn-Mg-Zr-V wires
Abstract
To ensure the use of 7000 series for safety-relevant applications in automobiles, such as screws, a comprehensive understanding of their exfoliation corrosion (EFC) behavior is requested. The EFC behavior of Cu-free Al-Zn-Mg-Zr-V wires in solution annealed (T4), peak-aged (T6) and overaged (T7) state is investigated by EXCO immersion tests combined with (quasi) in situ measurements of the dissolved species using inductively coupled plasma mass spectrometry (ICP-MS) and electrochemical impedance spectroscopy (EIS). Supplemented ex-situ investigations of the EFC progress are performed using X-ray computed tomography. The EFC behavior is linked to microstructural features that are investigated using i. a. scanning (transmission) electron microscopy (SEM/STEM) coupled with energy dispersive X-ray spectroscopy (EDS) and electron backscatter diffraction (EBSD). Wire drawing and heat treatment have a significant effect on the microstructure, the EFC susceptibility and the corresponding EFC mechanism. EFC susceptibility decreases from T4 to T7 state and is less pronounced in the wire core compared to the rim zone, while in T7 it is the opposite. Dependent on heat treatment and related microstructure, the corrosion mechanism changes from intergranular corrosion (T4) to pitting (T7). Quasi in situ measurements of theelectrolyte species are linked to the corrosion mechanisms.