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Wear and Corrosion Performance of Al-Cu-Fe-(Cr) Quasicrystalline Coatings Produced by HVOF

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Abstract

High-velocity oxygen fuel coatings were produced using gas-atomized Al62.5Cu25Fe12.5 and Al67Cu20Fe5Cr8 powders onto a ferritic stainless-steel substrate, resulting in two similar microstructures, consisting mainly of quasicrystalline phases. The goal of this work was to evaluate the performance of the quasicrystalline coatings under standard wear and corrosion tests. The samples were characterized by x-ray diffraction and scanning and transmission electron microscopy. Wear and friction behavior of the coatings and substrate were assessed by pin-on-disk tests. Vickers microhardness was also measured. The corrosion resistance was assessed through electrochemical measurements performed in alkaline and acidic medium in the absence and in the presence of chlorides. The coefficient of friction of the quasicrystalline coatings were inferior to the substrate, particularly the Al-Cu-Fe coating, with values close to 0.1. The Al62.5Cu25Fe12.5 alloy also showed the lowest specific wear rate, 1.7 × 10−4 mm3/N m, among the materials tested. In the presence of chlorides, the chromium containing coating presented better corrosion resistance with less surface damage after testing. However, the corrosion rate of the coating samples was low in both chloride-free alkaline and acidic conditions. Both Al62.5Cu25Fe12.5 and Al67Cu20Fe5Cr8 coatings presented corrosion potential considerably lower than the substrate for all tested media, which may be interesting for cathodic protection.

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Acknowledgments

The authors are grateful for the financial support granted by FAPESP (Processes No. 2015/09008-0 and No. 2013/05987-8), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001 and CNPq. The authors are also grateful for the technical assistance on TEM, SEM analysis and sample preparation from Laboratory of Structure Characterization of Federal University of São Carlos (UFSCar).

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  1. Programa de Pós-Graduação em Ciência e Engenharia de Materiais, Universidade Federal de São Carlos, Rod. Washington Luiz, km 235, São Carlos, SP, 13565-905, Brazil

    Witor Wolf

  2. Departamento de Engenharia Metalúrgica e de Materiais, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, MG, 31270-901, Brazil

    Witor Wolf

  3. Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, Rod.Washington Luiz, km 235, São Carlos, SP, 13565-905, Brazil

    Guilherme Y. Koga, Claudio S. Kiminami, Claudemiro Bolfarini & Walter J. Botta

  4. Hydro-Quebec Research Institute, 1800 Boul. Lionel Boulet, Varennes, QC, J3X 1S1, Canada

    Robert Schulz & Sylvio Savoie

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WW, GYK, CB, CSK, and WJB designed the study. WW, RS, and SS fabricated the samples. WW and GYK characterized the samples. All authors contributed on data analysis, discussing and/or manuscript writing.

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Wolf, W., Koga, G.Y., Schulz, R. et al. Wear and Corrosion Performance of Al-Cu-Fe-(Cr) Quasicrystalline Coatings Produced by HVOF. J Therm Spray Tech 29, 1195–1207 (2020). https://doi.org/10.1007/s11666-020-01053-2

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