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

Research output: Contribution to journalArticlepeer-review

Authors

  • Veronica Rafla
  • Andrew D. King
  • Sarah Glanvill
  • Aaron Parsons
  • John R. Scully

Colleges, School and Institutes

External organisations

  • West Virginia University
  • Diamond Light Source

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.

Details

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

Keywords

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