Abstract
The dealloying performances of the free side and roller side of the Al50Au50 ribbons are investigated under different dealloying conditions. The free side consisting of Al2Au, AlAu, and AlAu2 phases undergoes more severe corrosion than the monophasic AlAu roller side. The Al2Au phase not only acts as an anodic electrode in galvanic corrosion of free side but also leaves nanoporous Au behind and induces further dealloying of AlAu by the capillary action. The oxide film is confirmed as Al–O film with solubilized Au atoms. During corrosion, the Au atoms in oxide film tend to segregate into Au-rich and Au-lacked regions. The Au-rich region remained can enhance the Au-content on surface and impede the further corrosion.
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