4.7 Article

Measurement of localized corrosion rates at inclusion particles in AA7075 by in situ three dimensional (3D) X-ray synchrotron tomography

Journal

CORROSION SCIENCE
Volume 104, Issue -, Pages 330-335

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2015.12.027

Keywords

Aluminum alloys; Intermetallic; X-ray tomography; Pitting corrosion

Funding

  1. Office of Naval Research (ONR) [N00014-10-1-0350]

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In situ X-ray synchrotron tomography was used to measure the localized corrosion rate of Mg2Si particles present in 7075 aluminum alloys in deionized ultra-filtered (DIUF) water. The evolution of hydrogen bubbles was captured as a function of time and the measured volume was used to calculate the local corrosion rate of Mg2Si particles. It was shown that in the absence of chloride ions, stress was needed to create fresh particle surfaces, either by fracture or debonding, to initiate corrosion at the particles. (C) 2016 Elsevier Ltd. All rights reserved.

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