Effect of delayed inhibitor supply on AA2024-T3 intermetallic activity: A local in situ analysis with reflected microscopy

Marlon Mopon*, Arjan Mol, Santiago J. Garcia*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Understanding how late an inhibitor can be released once corrosion initiated without compromising corrosion protection may help in developing more efficient anticorrosion coatings. We explored this idea through time-controlled Ce(NO3)3 availability to AA2024-T3 immersed in 0.05 M NaCl. Ce(NO3)3 was supplied at 0, 30, 60, and 180 s from the start of immersion to get a concentration of 0.001 M. Detailed visualization of surface changes at the intermetallic particle level was obtained using in-situ reflected microscopy. SEM-EDX and confocal laser microscopy confirmed the extent of intermetallic degradation and local inhibitor deposition corresponding to operando changes. When the inhibitor is supplied within 60 s of immersion, the surface changes slowdown earlier and are visually less extensive than in uninhibited systems. Furthermore, our results highlight the potential of reflected microscopy for local corrosion inhibition studies and underscore the importance of understanding the interaction between inhibitor release timing and corrosion protection.

Original languageEnglish
Article number111910
Number of pages13
JournalCorrosion Science
Volume230
DOIs
Publication statusPublished - 2024

Funding

The author acknowledges the financial support by the DOST ERDT Program and the Faculty of Aerospace Engineering at TU Delft.

Keywords

  • Corrosion inhibition
  • Difference imaging
  • Inhibitor deposition kinetics
  • Metallographic microscopy

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