Surface modification of 5083 Aluminum-Magnesium induced by marine microorganisms

Julien Jaume (1) , Maria Joao Marques (2, 1) , Marie-Line Délia (1) , Régine Basséguy (1)

1 LGC - Laboratoire de Génie Chimique
2 LNEG - Laboratório Nacional de Energia e Geologia

The influence of microorganisms from a salt marsh in the surface modification of 5083 aluminium alloy (Al-Mg) in seawater was evaluated. An immersion test performed for 50 days in biotic and abiotic conditions, with electrochemical monitoring and surface/cross-section characterization by SEM/EDX and TEM after exposure, showed that microorganisms induced the formation of a homogenous layer on the Al-Mg surface. This layer, which proved to be composed of a double-structure: a dense, amorphous inner layer and a more porous outer layer, was demonstrated to influence the corrosion resistance of the Al-Mg alloy in seawater.

Mots clés: 5083 aluminum-magnesium alloy; Surface Modification; Microbiologically Influenced Corrosion Inhibition (MICI); Salt Marsh; marine corrosion; corrosion protection

Domaines: Matériaux

Julien Jaume, Maria Joao Marques, Marie-Line Délia, Régine Basséguy. Surface modification of 5083 Aluminum-Magnesium induced by marine microorganisms. Corrosion Science, 2022, 194, pp.109934. ⟨10.1016/j.corsci.2021.109934⟩. ⟨hal-03440993⟩