Abstract
The effects of manganese on the aqueous corrosion of aluminum-manganese alloys were investigated by experiments and atomistic simulations. Electrochemical measurements, x-ray photoelectron spectroscopy, and atom probe tomography analysis indicate that manganese addition enhanced the corrosion resistance of aluminum without participating in the surface oxidation. The selective dissolution of manganese was believed to increase the free volume at the metal/oxide interface to facilitate the formation of a denser, thinner oxide layer with closer to stoichiometry composition. Atomistic simulations showed that the oxide layer compactness increased, and defect density decreased with increasing free volume content in Al, resulting in enhanced barrier characteristics.
| Original language | English |
|---|---|
| Article number | 108749 |
| Journal | Corrosion Science |
| Volume | 173 |
| DOIs | |
| State | Published - Aug 15 2020 |
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 ). This research was financially supported by the US National Science Foundation DMR-1856196 . J.C. and W.C. gratefully acknowledge the discussion of XPS analysis and results with Dr. Weinan Leng of the Nanoscale Characterization and Fabrication Laboratory and Dr. David F. Cox of Chemical Engineering at Virginia Tech. Selected X-ray diffraction measurements were conducted at the Virginia Tech Crystallography (VTX) Lab with support from the Virginia Tech National Center for Earth and Environmental Nanotechnology Infrastructure (NanoEarth, NSF Cooperative Agreement 1542100). APT was conducted at the Center for Nanophase Materials Sciences at the Oak Ridge National Lab, which is a DOE Office of Science User Facility. The authors would like to thank James Burns for APT sample preparation and running APT experiments. J.X. and C. D. acknowledge the use of computing resources provided by WestGrid and Compute/Calcul Canada. This research was financially supported by the US National Science FoundationDMR-1856196. J.C. and W.C. gratefully acknowledge the discussion of XPS analysis and results with Dr. Weinan Leng of the Nanoscale Characterization and Fabrication Laboratory and Dr. David F. Cox of Chemical Engineering at Virginia Tech. Selected X-ray diffraction measurements were conducted at the Virginia Tech Crystallography (VTX) Lab with support from the Virginia Tech National Center for Earth and Environmental Nanotechnology Infrastructure (NanoEarth, NSF Cooperative Agreement 1542100). APT was conducted at the Center for Nanophase Materials Sciences at the Oak Ridge National Lab, which is a DOE Office of Science User Facility. The authors would like to thank James Burns for APT sample preparation and running APT experiments. J.X. and C. D. acknowledge the use of computing resources provided by WestGrid and Compute/Calcul Canada.
| Funders | Funder number |
|---|---|
| Chemical Engineering at Virginia Tech | |
| Compute/Calcul Canada | |
| DOE Office of Science | |
| US National Science FoundationDMR-1856196 | |
| Virginia Tech National Center for Earth and Environmental Nanotechnology Infrastructure | |
| National Science Foundation | 1856196, 1542100, DMR-1856196 |
| U.S. Department of Energy |
Keywords
- Al alloys
- Atom probe tomography
- Atomistic simulation
- Corrosion
- X-ray photoelectron spectroscopy