The evolution of pit morphology and growth kinetics in aluminum during atmospheric corrosion

Noell, Philip J.; Karasz, Erin; Schindelholz, Eric J.; Polonsky, Andrew T.; Campbell, Ian; Katona, Ryan M.; Melia, Michael A.

doi:10.1038/s41529-023-00328-7

Title: The evolution of pit morphology and growth kinetics in aluminum during atmospheric corrosion

Journal Article · 15 February 2023 · npj Materials Degradation

DOI: https://doi.org/10.1038/s41529-023-00328-7 · OSTI ID:1926742

; Karasz, Erin; Schindelholz, Eric J.;

; Campbell, Ian;

; Melia, Michael A.

Abstract Assessing the lifetimes of alloys in humid, corrosive environments requires growth kinetic information regarding individual instances of damage, e.g. pit growth rates. Corrosion rates measured at the continuum scale using mass change convolute the rate of pit nucleation and growth, providing limited information on local kinetics. The current study used in-situ X-ray computed tomography to measure growth rates of individual pits in aluminum over 100 h of exposure in a humid, chloride environment. While pits grew at relatively constant rates over the first hours after nucleation, significant growth-rate nonlinearities subsequently occurred. These were linked to both droplet spreading, which altered the cathode size, and changes in the mode of pit growth. Pit morphology appeared to influence the dominant growth mode and the duration of pit growth. Post-mortem serial sectioning revealed pits preferentially attacked grain-boundary triple junctions and dislocation boundaries.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NA0003525

OSTI ID:: 1926742

Journal Information:: npj Materials Degradation, Journal Name: npj Materials Degradation Journal Issue: 1 Vol. 7; ISSN 2397-2106

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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