Journal article
Stable pit formation on AA2024-T3 in a NaCl environment
A Boag, RJ Taylor, TH Muster, N Goodman, D McCulloch, C Ryan, B Rout, D Jamieson, AE Hughes
Corrosion Science | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2010
Abstract
Scanning vibrating electrode (SVE), particle induced X-ray emission spectroscopy (PIXE) and standard electrochemical measurements were used to study the establishment of stable pits on AA2024-T3 in neutral sodium chloride solution (0.1 M NaCl). Pits were allowed to develop until hydrogen evolution was observed. Typical current at the mouth of the pits were in the vicinity of 1 mA. PIXE maps revealed the intermetallic (IM) particle distributions in the surface as well as significant chloride buildup around the pits. A significant fraction of the small selection of pits examined here appeared to have an S-phase particle (or remnant) within 20 μm of a AlCuFeMn type IM particle suggesting a coup..
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Funding Acknowledgements
Part of the work was completed under the Corrosion Prediction Modeling program between BAE SYSTEMS, CSIRO and DSTO (1999 - 2003). The authors would like to thank Mr. A. Stonham of BAE Systems, Salisbury, Australia and Drs. S. Harris, D. Dixon, P. Morgan, M. Hebbron and S. Church for useful discussions. BAE Systems are acknowledged for providing financial and technical support for part of this work through the Corrosion Prediction Modeling project. The remainder of this work was funded internally through CSIRO.