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Microstructure and corrosion behavior of Cu-based alloys containing Al-Ag after normalizing and annealing heat treatments

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Abstract

The alloys of the aluminum bronze system contain 5–14wt% Al that can be heat treated giving as result of different microstructures that were characterized by optical microscopy and scanning electron microscopy. This work aimed at investigating the influence of the microstructures of a Cu-9Al-3Ag alloy obtained after normalizing and annealing heat treatments, on the corrosion behavior in a saline medium containing 0.5 M sodium chloride, NaCl. The corrosion effect on the phases compounding the overall microstructures as result of immersing the samples in the corrosive medium was evaluated using cyclic voltammetry, potentiodynamic polarization curves, and electrochemical impedance spectroscopy. The results showed that normalizing and annealing heat treatments redefined the distribution of the α phase and, in addition led to formation of proeutectoid pearlite (α + γ2), which is a microstructural constituent configured similarly to that present in diverse carbon steels, though in this case displaying a sequence of alternate lamellae of α and γ2, respectively. From the results of the linear polarization plots, the maximum anodic potentials became apparent, just like the regions where the trend of the graph gave the impression that passivation were to gain control. Likewise, the Tafel plots and impedance tests evidenced that the as-cast and normalized samples exhibited a better resistance to corrosion, at variance with the results of the annealed sample.

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Acknowledgements

DFS is grateful for the scholarship granted by CONACyT to carry out doctoral studies, likewise, to the CBI Division at UAM-A for the support with the use of the scanning electron microscope. To the LIEIM laboratory of the Área Ingeniería de Materiales, Departamento de Materiales, UAM-A for allowing the use of equipment and materials. MASR, MGA, MEPP, and MARR would like to thank the SNI for the distinction of their membership and the stipend received. The authors are indebted to Dr. J. Uruchurtu for the English revision and upgrading of the manuscript.

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Authors and Affiliations

  1. Ciencia de Materiales, Área de Ingeniería de Materiales, Departamento de Materiales, Universidad Autónoma Metropolitana, Azcapotzalco, Av San Pablo No. 420, Col. Nueva El Rosario, Alcaldía Azcapotzalco, 02128, Ciudad de Mexico, México

    D. Flores-Sanchez, M. A. Suárez-Rosales, M. Landa-Castro, M. Palomar-Pardavé & M. A. Romero-Romo

  2. Área de Química Aplicada, Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana, Azcapotzalco, Av San Pablo No. 420, Col. Nueva El Rosario, Alcaldía Azcapotzalco, 02128, Ciudad de Mexico, México

    M. Gutiérrez-Arzaluz

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  1. D. Flores-Sanchez
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  2. M. A. Suárez-Rosales
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  3. M. Landa-Castro
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  4. M. Gutiérrez-Arzaluz
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  5. M. Palomar-Pardavé
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Correspondence to D. Flores-Sanchez or M. A. Romero-Romo.

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Flores-Sanchez, D., Suárez-Rosales, M.A., Landa-Castro, M. et al. Microstructure and corrosion behavior of Cu-based alloys containing Al-Ag after normalizing and annealing heat treatments. J Solid State Electrochem 27, 2937–2946 (2023). https://doi.org/10.1007/s10008-023-05565-z

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  • DOI: https://doi.org/10.1007/s10008-023-05565-z

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