Corrosion behavior of monophasic and multiphasic Al50Au50 ribbons in AlCl3 + HCl solution. (1st April 2020)

• Record Type: Journal Article
• Authors: Yan, Z.C.; Zhang, H.; Chen, Q.; Li, G.H.; Zhang, L.C.; Bian, X.F.; Wang, W.M.
• Is Part Of: Corrosion science. Volume 165(2020)
• Publication Date: 2020-04-01
• Subjects: AlAu alloy -- Passive film -- OCP fluctuation -- Space-charge region -- Au-contained Al2O3; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.108398
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: Monophasic Al50 Au50 ribbon has a wide passivation region in HCl solution. The passive film of monophasic ribbon has a double-layer structure. Monophasic ribbon has a higher corrosion resistance than multiphasic one. Al2 Au phase in multiphasic ribbon promotes corrosion in HCl solution. Abstract: Monophasic Al50 Au50 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 Al2 Au-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 Al2 O3 with a double-layer structure.