When all intermetallics dealloy in AA2024-T3: Quantifying early stage intermetallic corrosion kinetics under immersion

Matteo Olgiati, Paul J. Denissen, Santiago J. Garcia*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

A hyphenated optical-electrochemical technique and image analysis protocol is used to quantify global and local (intermetallic) corrosion process and kinetics. Our findings reveal an early stage (< 60 s) composition-dependent hierarchical local activation of all IMs that can be attributed to IM dealloying. This is followed by local trenching initiated at matrix locations adjacent to regions of the IMs previously dealloyed, which in turn develops into concentric trenching around the IMs. These stages have quantifiable activation times and kinetics. While dealloying kinetics are found to be strongly dependent on IM composition and slightly dependent on IM size in the case of the S-phases, trenching kinetics are IM composition and size independent.

Original languageEnglish
Article number109836
Number of pages10
JournalCorrosion Science
Volume192
DOIs
Publication statusPublished - 2021

Keywords

  • Corrosion mechanisms
  • Dealloying
  • Intermetallics
  • Local corrosion
  • Local electrochemistry

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