Enhanced corrosion resistance by engineering crystallography on metals

X. X. Wei, B. Zhang, B. Wu, Y. J. Wang, X. H. Tian, L. X. Yang, E. E. Oguzie and X. L. Ma ()
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X. X. Wei: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
B. Zhang: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
B. Wu: Bay Area Center for Electron Microscopy, Songshan Lake Materials Laboratory
Y. J. Wang: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
X. H. Tian: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
L. X. Yang: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
E. E. Oguzie: Africa Centre of Excellence in Future Energies and Electrochemical Systems, Federal University of Technology Owerri
X. L. Ma: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract Nanometer-thick passive films, which impart superior corrosion resistance to metals, are degraded in long-term service; they are also susceptible to chloride-induced localized attack. Here we show, by engineering crystallographic configurations upon metal matrices adjacent to their passive films, we obtain great enhancement of corrosion resistance of FeCr15Ni15 single crystal in sulphuric acid, with activation time up to two orders of magnitude longer than that of the non-engineered counterparts. Meanwhile, engineering crystallography decreases the passive current density and shifts the pitting potential to noble values. Applying anodic polarizations under a transpassivation potential, we make the metal matrices underneath the transpassive films highly uneven with {111}-terminated configurations, which is responsible for the enhancement of corrosion resistance. The transpassivation strategy also works in the commercial stainless steels where both grain interior and grain boundaries are rebuilt into the low-energy configurations. Our results demonstrate a technological implication in the pretreatment process of anti-corrosion engineering.

Date: 2022
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DOI: 10.1038/s41467-022-28368-8

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