Corrosion behavior of monophasic and multiphasic Al50Au50 ribbons in AlCl3 + HCl solution

Monophasic Al50Au50 ribbons (labelled as S-2ann) were obtained by melt spinning and annealing. The corrosion properties of S-2ann were investigated in AlCl3 + HCl solution with as-spun multiphasic ribbons (labelled as S-2sp) for comparison. S-2ann is self-passivated and has a wide passivation region, while S-2sp tends to undergo Al2Au-induced selective dissolution under anodic polarization. Besides, S-2ann has a fluctuant open-circuit potential and a passive film with p-type semiconductor feature, which are not found in S-2sp. The passive film of S-2ann is examined to be Au-contained Al2O3 with a double-layer structure.