Dealloying-driven local corrosion by intermetallic constituent particles and dispersoids in aerospace aluminium alloys

A. Kosari, F. Tichelaar, P. Visser, H. Zandbergen, H. Terryn, J. M.C. Mol

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Abstract

Nanoscopic characterization of heterogeneous intermetallic particles (IMPs) which microstructurally and compositionally evolve during local corrosion is crucial in unravelling the mechanisms and sequence of initial and local corrosion events. Herein, we study site-specific initiation events focused on microscopic constituent intermetallic compounds and nanoscopic dispersoids in AA2024-T3 at the nanoscale using a combined quasi in-situ and ex-situ analytical TEM approach. Our findings show a dealloying-driven local corrosion initiation at the studied IMPs that have been considered as cathodic phases traditionally. Besides, local degradation which is a result of galvanic interactions between dealloyed regions of IMPs and their adjacent alloy matrix is largely governed by the intrinsic electrochemical instability of intermetallic compounds.

Original languageEnglish
Article number108947
Number of pages11
JournalCorrosion Science
Volume177
DOIs
Publication statusPublished - 2020

Keywords

  • Aerospace aluminium alloys
  • Cross-sectional ex-situ TEM
  • Dealloying
  • FIB/SEM analysis
  • Pitting corrosion
  • Quasi in-situ TEM

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