One dimensional wormhole corrosion in metals

Yang Yang, Weiyue Zhou, Sheng Yin, Sarah Y. Wang, Qin Yu, Matthew J. Olszta, Ya Qian Zhang, Steven E. Zeltmann, Mingda Li, Miaomiao Jin, Daniel K. Schreiber, Jim Ciston, M. C. Scott, John R. Scully, Robert O. Ritchie, Mark Asta, Ju Li, Michael P. Short, Andrew M. Minor

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

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.

Original languageEnglish (US)
Article number988
JournalNature communications
Volume14
Issue number1
DOIs
StatePublished - Dec 2023

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology
  • General Physics and Astronomy

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