Corrosion behavior of monophasic and multiphasic Al50Au50 ribbons in AlCl3 + HCl solution
School of Engineering
Monophasic Al50Au50 ribbons (labelled as S2ann) were obtained by melt spinning and annealing. The corrosion properties of S2ann were investigated in AlCl3 + HCl solution with as-spun multiphasic ribbons (labelled as S2sp) for comparison. S2ann is self-passivated and has a wide passivation region, while S2sp tends to undergo Al2Au-induced selective dissolution under anodic polarization. Besides, S2ann has a fluctuant open-circuit potential and a passive film with p-type semiconductor feature, which are not found in S2sp. The passive film of S2ann is examined to be Au-contained Al2O3 with a double-layer structure.