Journal
CORROSION SCIENCE
Volume 173, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.108749
Keywords
Al alloys; Corrosion; Atom probe tomography; X-ray photoelectron spectroscopy; Atomistic simulation
Funding
- US National Science Foundation [DMR-1856196]
- Virginia Tech National Center for Earth and Environmental Nanotechnology Infrastructure (NanoEarth, NSF) [1542100]
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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.
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