Statistical Study of the Corrosion Behavior of Al2CuMg Intermetallics in AA2024-T351 by SKPFM

Loïc Lacroix (1) , Laurence Ressier (2) , Christine Blanc (1) , Georges Mankowski (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 LPCNO - Laboratoire de physique et chimie des nano-objets

A statistical study combining atomic force microscopy, scanning Kelvin probe force microscopy (SKPFM), and energy-dispersive spectroscopy was carried out on more than 300 Al2CuMg intermetallic particles of AA2024 alloy to determine their corrosion behavior in chloride-containing solutions. The combination of these three techniques allowed the correlation of the dissolution depth of the S-phase particles to their SKPFM potential and their chemical composition. This study also revealed that SKPFM measurements must be carried out with many precautions, but it is a powerful tool for the study of localized corrosion.

Mots clés: aluminium alloys; atomic force microscopy; copper alloys; corrosion; magnesium alloys; surface composition; X-ray chemical analysis

Domaines: Matériaux

Loïc Lacroix, Laurence Ressier, Christine Blanc, Georges Mankowski. Statistical Study of the Corrosion Behavior of Al2CuMg Intermetallics in AA2024-T351 by SKPFM. Journal of The Electrochemical Society, 2008, vol. 155, pp.C8-C15. ⟨10.1149/1.2799089⟩. ⟨hal-00806025⟩