Galvanic corrosion of aluminium-copper model alloys

Jonathan Idrac (1) , Georges Mankowski (1) , George Thompson (2) , Peter Skeldon (2) , Yolande Kihn (3) , Christine Blanc (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 University of Manchester [Manchester]
3 CEMES - Centre d'élaboration de matériaux et d'études structurales

Galvanic coupling between different α and θ phase-containing model Al-Cu alloys, deposited by magnetron sputtering, has revealed that the anodic α phase did not suffer corrosion and remained in the passive state in sulphate solution. Conversely, sulphate ions induced pitting of the cathodic θ phase. Pitting susceptibility of the cathode increased when the difference between the copper content of the anode and cathode increased. Similar observations were made for all the galvanic couples; further, the higher the copper content of a phase, then the greater its susceptibility to pitting.

Mots clés: Aluminium; Copper; Intermetallics; Galvanic coupling; Sulphate

Domaines: Matériaux

Jonathan Idrac, Georges Mankowski, George Thompson, Peter Skeldon, Yolande Kihn, et al.. Galvanic corrosion of aluminium-copper model alloys. Electrochimica Acta, 2007, vol. 52, pp.7626-7633. ⟨10.1016/j.electacta.2007.05.056⟩. ⟨hal-00806058⟩