Morphogenic Modeling of Corrosion Reveals Complex Effects of Intermetallic Particles.

Autor: Batista BC; Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306, USA., Romanovskaia E; Department of Materials Science and Engineering, Center for Electrochemical Science and Engineering, University of Virginia, Charlottesville, VA, 22904, USA., Romanovski V; Department of Materials Science and Engineering, Center for Electrochemical Science and Engineering, University of Virginia, Charlottesville, VA, 22904, USA., Emmanuel M; Department of Chemistry, Saint Louis University, 3501 Laclede Ave., St. Louis, MO, 63103, USA., Burns JT; Department of Materials Science and Engineering, Center for Electrochemical Science and Engineering, University of Virginia, Charlottesville, VA, 22904, USA., Ma J; Department of Materials Science and Engineering, Center for Electrochemical Science and Engineering, University of Virginia, Charlottesville, VA, 22904, USA., Kiss IZ; Department of Chemistry, Saint Louis University, 3501 Laclede Ave., St. Louis, MO, 63103, USA., Scully JR; Department of Materials Science and Engineering, Center for Electrochemical Science and Engineering, University of Virginia, Charlottesville, VA, 22904, USA., Steinbock O; Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306, USA.
Jazyk: angličtina
Zdroj: Advanced science (Weinheim, Baden-Wurttemberg, Germany) [Adv Sci (Weinh)] 2024 Oct; Vol. 11 (39), pp. e2404986. Date of Electronic Publication: 2024 Aug 19.
DOI: 10.1002/advs.202404986
Abstrakt: Corrosion processes are often discussed as stochastic events. Here, it is shown that some of these seemingly random processes are not driven by nanoscopic fluctuations but rather by the spatial distribution of micrometer-scale heterogeneities that trigger fast reactions associated with corrosion. Using a novel excitable reaction-diffusion model, corrosion waves traveling over the metal surface and the associated material loss are described. This resulting nonuniform corrosion penetration, seen as a height loss in modeling, exposes buried intermetallic particles, which depending on the local electrochemical state of the surface trigger or block new waves. Informed by quantitative experimental data for the Mg-Al-Zn alloy AZ31B, wave speeds, wave widths, and average material loss are accurately captured. Morphogenic mitigation based on wave-breaking microparticles is also simulated. While AZ31B corrosion is identified as a process driven by rare-wave events, this study predicts several other corrosion regimes that proceed via spots or patchy patterns, opening the door for new protection, design, and prediction strategies.
(© 2024 The Author(s). Advanced Science published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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