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Journal of Materials Engineering and Performance

Erschienen in:

01.01.2014

Corrosion Performance Based on the Microstructural Array of Al-Based Monotectic Alloys in a NaCl Solution

verfasst von: Wislei R. Osório, Emmanuelle S. Freitas, Amauri Garcia

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 1/2014

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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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Titel: Corrosion Performance Based on the Microstructural Array of Al-Based Monotectic Alloys in a NaCl Solution
verfasst von: Wislei R. Osório
Emmanuelle S. Freitas
Amauri Garcia
Publikationsdatum: 01.01.2014
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 1/2014
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-013-0741-6

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