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Time-lapse lab-based x-ray nano-CT study of corrosion damage.

R S Bradley1, Y Liu2, T L Burnett1,2

  • 1Henry Moseley X-ray Imaging Facility, The University of Manchester, Manchester, M13 9PL, U.K.

Journal of Microscopy
|April 19, 2017
PubMed
Summary

A new time-lapse X-ray nano-CT protocol tracks material changes over time. It reveals strontium leaching from coatings and copper-driven corrosion in aluminum alloys, offering insights into material degradation.

Keywords:
Computed tomographyZernike phase contrastpaintplasma focused ion beam (PFIB)primer coating

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Corrosion Science

Background:

  • Understanding material degradation under environmental conditions is crucial.
  • Time-resolved imaging techniques are needed to capture dynamic morphological changes.
  • X-ray nanotomography (nano-CT) offers high-resolution 3D imaging capabilities.

Purpose of the Study:

  • To develop and validate an experimental protocol for time-lapse nano-CT imaging of environmentally driven material changes.
  • To investigate the leaching behavior of nanoparticle corrosion inhibitors in polymer coatings.
  • To study the corrosion mechanisms and progression in an AA2099 aluminum alloy.

Main Methods:

  • Developed a time-lapse X-ray nano-CT workflow.
  • Utilized a combination of X-ray absorption and phase contrast imaging.
  • Monitored morphological and compositional changes over extended periods (14 days and 12 hours).

Main Results:

  • Observed extensive leaching of strontium-rich components from a strontium aluminum polyphosphate pigment in a polymer coating.
  • Identified aluminum-rich components as more resistant to dissolution.
  • Found that initial grain boundary corrosion in AA2099 aluminum alloy is driven by copper-rich phases, followed by grain-specific corrosion.

Conclusions:

  • The developed time-lapse nano-CT protocol provides novel insights into dynamic material degradation processes.
  • The study elucidates the differential leaching behavior of components in pigmented coatings.
  • The findings reveal the role of specific phases and orientations in the corrosion of aluminum alloys.