• Volodymyr A. Polonskyy Oles Honchar Dnipro National University, Ukraine
  • Olena V. Sukhova Oles Honchar Dnipro National University, Ukraine



as-cast quasicrystalline alloys; decagonal quasicrystals; structure; acidic media; corrosion resistance


The structure and corrosion properties of as-cast quasicrystalline Al72Fe15Ni13 and Al72Co18Ni10 alloys in acidic media were studied in this work. The structure was investigated by the methods of quantitative metallography, X-ray analysis, scanning electron microscopy, and energy-dispersive X-ray spectrometry. Corrosion resistance was evaluated by gravimetric method in aqueous acidic solutions of HCl, H2SO4, HNO3, and H3PO4 (рН=1.0). Both the investigated alloys were shown to form stable decagonal quasicrystalline D-phases. In the Al72Co18Ni10 alloy, the D-phase is a primarily solidified phase but, in the Al72Fe15Ni13 alloy, the D-phase is formed peritectically. Depending on the alloy composition, two types of decagonal quasicrystals were observed that belong in Al72Fe15Ni13 and Al72Co18Ni10 alloys, respectively, to Al86Fe14- and Al73Co27-based compounds alloyed with Ni. The Al72Fe15Ni23 alloy exhibits the highest resistance to corrosion in the nitric acidic solution, but the Al72Co18Ni10 alloy – in chloric, orthophosphoric, and sulphuric acidic solutions (in descending order). For both alloys, in the most solutions, relatively uniform dissolution of the alloys’ surface is observed except for the more defective areas that dissolve at a higher rate.


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Physical and inorganic chemistry