Peculiarities in structure formation and corrosion of cast quasicrystalline Al63Cu25Fe12 and Al63Co24Cu13 alloys in sodium chloride aqueous solution

O. V. Sukhova; V. A. Polonskyy

doi:10.15330/pcss.21.3.530-536

Authors

O. V. Sukhova Oles’ Honchar Dniprovs’k National University
V. A. Polonskyy Oles’ Honchar Dniprovs’k National University

DOI:

https://doi.org/10.15330/pcss.21.3.530-536

Keywords:

icosahedral quasicrystals, decagonal quasicrystals, structure, electrochemical polarization, pitting corrosion

Abstract

In this work the structure and corrosion behavior of quasicrystalline cast Al₆₃Cu₂₅Fe₁₂ and Al₆₃Co₂₄Cu₁₃ alloys in 5-% sodium chloride solution (рН 6.9–7.1) were investigated. The alloys were cooled at 5 К/s. The structure of the samples was studied by methods of quantitative metallography, X-ray analysis, and scanning electron microscopy. Corrosion properties were determined by the potentiodynamic method. The made investigations confirm the formation of stable quasicrystalline icosahedral (y) and decagonal (D) phases in the structure of Al₆₃Cu₂₅Fe₁₂ and Al₆₃Co₂₄Cu₁₃ alloys correspondingly. In 5-% sodium chloride solution, the investigated alloys corrode under electrochemical mechanisms with oxygen depolarization. Compared with Al₆₃Cu₂₅Fe₁₂ alloy, Al₆₃Co₂₄Cu₁₃ alloy has a less negative value of free corrosion potential (–0.43 V and–0.66 V, respectively), and its electrochemical passivity region extends due to the inhibition of anodic processes. A corrosion current density, calculated from (E,lgi)-curve, for Al₆₃Co₂₄Cu₁₃ alloy amounts to 0.18 mА/сm² and for Al₆₃Cu₂₅Fe₁₂ alloy – to 0.20 mА/сm². The lower corrosion resistance of Al₆₃Cu₂₅Fe₁₂ alloy may be explained by the presence of iron-containing phases in its structure. Based on obtained results, the Al₆₃Co₂₄Cu₁₃ alloy was recommended as a coating material for rocket-and-space equipment working in a marine climate.

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