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

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

doi:10.1016/j.corsci.2021.109745

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

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

Materials MicroAnalysis

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

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. 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.

Original language	English
Article number	109745
Journal	Corrosion Science
Volume	191
DOIs	https://doi.org/10.1016/j.corsci.2021.109745
State	Published - Oct 2021

Funding

This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). FIB and TEM were performed at Center for Electron Microscopy and Analysis at The Ohio State University. APT was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility. We acknowledge Prof. Liang Zhen and Prof. Jian-Tang Jiang for providing AA7055 materials. This research was not supported by any grants from funding agencies in the public, commercial, or not-for-profit sectors.

Funders	Funder number
U.S. Department of Energy
Office of Science

Keywords

Aluminum alloy
Atom probe tomography
Microstructure
Polarization
Subsurface
Transmission electron microscopy

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10.1016/j.corsci.2021.109745

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abstract = "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. 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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AB - 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. 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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Influence of artificial aging on corrosion of abraded Al-Zn-Mg-Cu alloys

Abstract

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Keywords

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