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Title: Review—Corrosion-Resistant Metastable Al Alloys: An Overview of Corrosion Mechanisms
Award ID(s):
1760204 2131440
PAR ID:
10164343
Author(s) / Creator(s):
;
Date Published:
Journal Name:
Journal of The Electrochemical Society
Volume:
167
Issue:
8
ISSN:
1945-7111
Page Range / eLocation ID:
081504
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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  1. Abstract Corrosion is a ubiquitous failure mode of materials. Often, the progression of localized corrosion is accompanied by the evolution of porosity in materials previously reported to be either three-dimensional or two-dimensional. However, using new tools and analysis techniques, we have realized that a more localized form of corrosion, which we call 1D wormhole corrosion, has previously been miscategorized in some situations. Using electron tomography, we show multiple examples of this 1D and percolating morphology. To understand the origin of this mechanism in a Ni-Cr alloy corroded by molten salt, we combined energy-filtered four-dimensional scanning transmission electron microscopy and ab initio density functional theory calculations to develop a vacancy mapping method with nanometer-resolution, identifying a remarkably high vacancy concentration in the diffusion-induced grain boundary migration zone, up to 100 times the equilibrium value at the melting point. Deciphering the origins of 1D corrosion is an important step towards designing structural materials with enhanced corrosion resistance. 
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