Abstract
The aim of this study is to compare the electrochemical behavior of three monotectic Al-based alloys (Al-Pb, Al-Bi, and Al-In) in a 0.5 M NaCl solution at room temperature. Two distinct microstructure arrays were experimentally obtained for each Al monotectic alloy by using a water-cooled unidirectional solidification system. Results of electrochemical impedance spectroscopy (EIS) plots, potentiodynamic polarization curves, and impedance parameters obtained by an equivalent circuit analysis are discussed. It was found that the Al-Pb alloy has lower corrosion current density, higher polarization resistance, lower relative weight, and cost than the corresponding values of Al-Bi and Al-In alloys. It is also shown that the electrochemical behavior of the three alloys examined are intimately correlated with the scale of the corresponding microstructure, with smaller droplets and spacings (i.e., cell and interphase spacings) being associated with a decrease in the corrosion resistance.
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The authors acknowledge the financial support provided by, CNPq (The Brazilian Research Council), and FAEPEX-UNICAMP.
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Osório, W.R., Freitas, E.S. & Garcia, A. Corrosion Performance Based on the Microstructural Array of Al-Based Monotectic Alloys in a NaCl Solution. J. of Materi Eng and Perform 23, 333–341 (2014). https://doi.org/10.1007/s11665-013-0741-6
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DOI: https://doi.org/10.1007/s11665-013-0741-6