Local re-immersion behaviour of Ce-based inhibiting layers on AA2024-T3 intermetallics
Enhanced stability through partial dealloying and prolonged exposure
M. Mopon (University of the Philippines Diliman, TU Delft - Group Garcia Espallargas)
J.M.C. Mol (TU Delft - Team Arjan Mol)
Santiago J. Garcia (TU Delft - Group Garcia Espallargas)
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Abstract
The stability of inhibiting layers on AA2024-T3 intermetallic particles (IMPs) during re-immersion in saline following an initial immersion in a Ce(III)-containing electrolyte was investigated using in situ reflected light microscopy. Re-immersion behaviour varied due to differences in IMP composition, spatial distribution, and Ce(III) precipitation. IMPs were grouped into four categories based on whether their activity was high or low during both the immersion and re-immersion stages. Majority of the high activity particles during re-immersion had low activity during immersion. Longer immersion times (up to 72 h) and a brief delay in inhibitor supply (30 s) reduced re-immersion activity by increasing Ce(III) coverage. These findings suggest that corrosion protection systems promoting greater Ce(III) precipitation may enhance re-immersion stability.
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