Abstract
Corrosion of quasicrystalline and related crystalline phases in the Al–Cu–Fe system was investigated by anodic polarization in acid and alkaline solutions at room temperature. Corrosion products as well as surface morphology were measured by means of X-ray diffraction, scanning and transmission electron microscopy. During polarization of icosahedral quasicrystals in a strong alkaline solution a two-layered film is formed: an inner layer with reduced Al content which consists of quasicrystals and a bcc phase and an nanocrystalline oxide layer with a needle-like morphology. At low pH (<2) dissolution of the quasicrystalline phases was observed to precede deposition of a porous Cu film. In a strong alkaline medium icosahedral quasicrystals have a smaller corrosion resistance than neighboring crystalline phases, e.g. the β-phase (Al50Cu30Fe20); in strong acid solution other crystalline phases (for example Al2Cu) show less corrosion. The open circuit potentials have been observed to vary in a similar manner.
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