Influence of artificial aging on corrosion of abraded Al-Zn-Mg-Cu alloys

Wang, Shan-Shan; Huber, D.; Poplawsky, J. D.; Frankel, G. S.

doi:10.1016/j.corsci.2021.109745

Title: Influence of artificial aging on corrosion of abraded Al-Zn-Mg-Cu alloys

Journal Article · Wed Aug 04 00:00:00 UTC 2021 · Corrosion Science

DOI: https://doi.org/10.1016/j.corsci.2021.109745 · OSTI ID:1841470

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The Ohio State Univ., Columbus, OH (United States). Fontana Corrosion Center
The Ohio State Univ., Columbus, OH (United States). Center for Electron Microscopy and Analysis
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Surface abrasion has been shown to create altered surface layers (ASLs) that are hundreds of nm thick on all types of Al alloys. Such ASLs have lower corrosion resistance than the underlying substrate of Al-Zn-Mg-Cu alloys. Here, we demonstrate how heat treatments affect the ASL microstructure on abraded Al-Zn-Mg-Cu alloys using transmission electron microscopy and atom probe tomography, and also how the corrosion properties change using electrochemical polarization. Additionally, high temperature treatments on the abraded bulk samples enhance η phase precipitation in the ASL, leading to a decreased Zn content in the ASL solid solution, which ennobles the ASL breakdown potential.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1841470

Journal Information:: Corrosion Science, Journal Name: Corrosion Science Vol. 191; ISSN 0010-938X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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