Markley, T.Dligatch, S.Trinchi, A.Muster, T. H.Bendavid, A.Martin, P.Lau, D.Bradbury, A.Furman, S.Cole, I. S.2026-07-032026-07-030010-938XORCID:/0000-0001-6582-1457/work/219176385https://hdl.handle.net/1885/733812724The role of oxide bi-layers in controlling the onset of corrosion has been explored. A high-throughput electrochemical approach was employed to determine the breakdown potential of aluminium metal over-coated with combinations of silicon, titanium, aluminium and magnesium oxides. Bi-layered coatings consisting of two 100. nm thick metal oxide layers provided increased protection against breakdown, and combinations with vastly different iso-electric point of solid (IEPS) were found to exhibit improved barrier properties in comparison to single-component oxides. Furthermore, the most protective oxide bi-layers were produced when a high IEPS oxide was deposited directly onto the metal surface and subsequently over-coated with a low IEPS oxide. The barrier properties of bi-layer coatings appear to be tuneable, with notable dependencies on surface charge and thickness.4enA. AluminiumB. PolarizationC. Electrochemical calculationC. Oxide coatingsC. Passive films201010.1016/j.corsci.2010.07.02877957662523