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Study of Electrochemical Corrosion in Samples of a Horizontally Solidified AlCuSi Alloy

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Abstract

Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and microstructure characterization were performed on directionally solidified samples of the Al–3Cu–2Si alloy in order to study their corrosion behavior in a 0.2 M HCl electrolyte. Corrosion resistance of the investigated samples was correlated with solidification parameters, such as growth (VL), cooling rates (TR) and secondary dendritic spacing (λ2). Optical microscopy was used to characterize both the as-cast and corroded microstructures. For an immersion time of 24 hours in acidic solution, optical micrographs indicated that Si addition to Al-3Cu alloy promoted a significant decrease in the average fractions of α-Al phase increasing anodic activity of the Al-3Cu-2Si alloy. Using Tafel extrapolation, it is shown that the secondary dendritic arm spacing (λ2) acts as a factor influencing the corrosion current density (Icorr). All the EIS diagrams reveal a unique capacitive time constant and the size of the semi-circle decreases with increasing the time of immersion. Nyquist plots demonstrate that higher λ2 values cause a decrease in resistance of polarization, indicating the presence of a very thin film of aluminum oxide associated with a lower corrosion resistance.

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Acknowledgements

The authors acknowledge the financial support provided by UFPA - Federal University ofPará, PPGEM/ITEC/UFPA - Postgraduate Program in Mechanical Engineering, FEQ/ITEC/UFPA - Faculty of Chemical Engineering, IFPA - Federal Institute of Education, Science and Technology of Pará, PPGEMat/IFPA - Postgraduate Program in Materials Engineering, and CNPq - National Council for Scientific and Technological Development (Grants 302846/2017-4 and 304924/2020-2).

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  1. Institute of Technology, Federal University of Pará, UFPA, Augusto Corrêa Avenue 1, Belém, PA, 66075-110, Brazil

    Têyla C. Silva, André S. Barros, José C. Filho, Antonio L. Moreira & Otavio L. Rocha

  2. Federal Institute of Education, Science and Technology of Pará, IFPA, Almirante Barroso Avenue 1155, Belém, PA, 66093-020, Brazil

    Carolina R. Barbosa & Otavio L. Rocha

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  1. Têyla C. Silva
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Silva, T.C., Barros, A.S., Filho, J.C. et al. Study of Electrochemical Corrosion in Samples of a Horizontally Solidified AlCuSi Alloy. Inter Metalcast 16, 1191–1205 (2022). https://doi.org/10.1007/s40962-021-00657-w

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