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Correlation Between Microstructure and Corrosion Behavior of Near-Equilibrium Al-Co Alloys in Various Environments

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Abstract

Al-rich Al-Co alloys belong to a broad family of complex metallic alloys. These alloys contain structurally complex intermetallic phases inclusive of quasicrystals. The chemical properties of these phases are relatively unknown. The corrosion resistance of non-equilibrium Al-Co alloys in aqueous NaCl solution is influenced by aluminum content of Al-Co phases present. The only exception is structurally complex Z-Al3Co phase. To elucidate this phenomenon, the Al71Co29 and Al74Co26 alloys (metal contents are given in at.%) were prepared by arc melting and annealed at 1050 °C for 330 h. After annealing, the samples were rapidly cooled to reach near-equilibrium condition. Their phase constitution and microstructure were studied using both x-ray diffraction and energy-dispersive x-ray spectrometry coupled with scanning electron microscopy, The Al71Co29 alloy was found to consist of Al5Co2 and B2 phases. The Al74Co26 alloy was composed of Al5Co2 and Z-Al3Co phases. The samples were corrosion tested in water solutions of NaCl, HCl and NaOH by potentiodynamic polarization. In NaCl and HCl, the pitting corrosion was observed. In aqueous NaOH solution, a uniform corrosion occured. In alkaline and acidic environments, the most aggressive and the weakest corrosion attacks were found, respectively. Good corrosion resistance of the Z-Al3Co phase in chlorine anions containing environments was observed. Possible explanation of such behavior has been discussed.

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Acknowledgments

The authors wish to thank to the European Regional Development Fund (ERDF) for financial support of the Project ITMS:26220120048 “Center for development and application of advanced diagnostic methods in processing of metallic and non-metallic materials” funded within the Research and Development Operational Programme, to the Grant Agency VEGA for the financial support under Contracts 1/0018/15, 1/0465/15 and 1/0068/14, to the Slovak Research and Development Agency for the financial support under Contract APVV-15-0049 and to the Ministry of Education, Science, Research and Sport of the Slovak Republic for the financial support under Contract No. 003STU-2-3/2016.

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Authors and Affiliations

  1. Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24, Trnava, Slovak Republic

    Pavol Priputen, Marián Palcut, Martin Babinec, Jozef Mišík & Ivona Černičková

  2. Slovak University of Technology in Bratislava, Vazovova 5, 812 43, Bratislava, Slovak Republic

    Jozef Janovec

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  1. Pavol Priputen
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  2. Marián Palcut
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Correspondence to Pavol Priputen.

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Priputen, P., Palcut, M., Babinec, M. et al. Correlation Between Microstructure and Corrosion Behavior of Near-Equilibrium Al-Co Alloys in Various Environments. J. of Materi Eng and Perform 26, 3970–3976 (2017). https://doi.org/10.1007/s11665-017-2844-y

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  • DOI: https://doi.org/10.1007/s11665-017-2844-y

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