Operando observation of galvanic corrosion between aluminum alloy 7050-T7451 and 304 stainless steel in a simulated fastener arrangement using x-ray tomography

Veronica Rafla*, Andrew D. King, Sarah Glanvill, Aaron Parsons, Alison Davenport, John R. Scully

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

X-ray computed tomography (XCT) was used to nondestructively observe the hidden corrosion damage operando on aluminum alloy (AA) 7050-T7451 coupled to stainless steel (SS) 304 under a droplet of chloride-containing electrolyte. XCT enabled a three-dimensional assessment of corrosion damage evolution. AA7050 cylinders containing concentric embedded SS304 cylinders simulating a fastener were exposed under NaCl droplets at 97% RH for various times. Both the volume of corrosion damage and the initial volume of constituent particles were monitored and considered for further analysis. Three-dimensional image reconstruction indicated that the combination of stainless steel and constituent particles could support the growth of several corrosion fissures over the exposure period.

Original languageEnglish
Pages (from-to)1171-1176
Number of pages6
JournalCorrosion
Volume71
Issue number10
DOIs
Publication statusPublished - 1 Oct 2015

Keywords

  • Aluminum alloy 7050
  • Galvanic corrosion
  • Simulated fastener
  • X-ray computed tomography

ASJC Scopus subject areas

  • Materials Science(all)
  • Chemical Engineering(all)
  • Chemistry(all)

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