In this study, electrochemical impedance spectroscopy (EIS) plots and potentiodynamic polarization curves of tests carried out with monotectic Al-Pb alloy samples in a 0.5 Molar sodium chloride (NaCl) solution at 25°C are evaluated. It is shown that for a microstructure characterized by immiscible Pb droplets disseminated into an Al matrix, the microstructural array and segregation pattern are the corrosion driving forces. Microstructures characterized by Pb droplets of higher diameter and more homogeneously distributed into the Al-matrix, typical of positions close to the casting surface, have lower corrosion resistance. This has been attributed to a higher anode/cathode area that characterizes such microstructures and that, as a consequence, induces a higher number of galvanic couples that are formed between the Pb droplets and the Al matrix.
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1 October 2014
CORROSION SCIENCE|
May 22 2014
Electrochemical Impedance Spectroscopy and Potentiodynamic Polarization Studies Affected by the Microstructure Array of a Monotectic Al-Pb Alloy in a NaCl Solution
Wislei R. Osório;
‡Corresponding author: E-mail address: wislei.osorio@fca.unicamp.br.
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CORROSION (2014) 70 (10): 1031–1042.
Article history
Received:
March 26 2014
Revision Received:
May 05 2014
Accepted:
May 05 2014
Citation
Wislei R. Osório, Emmanuelle S. Freitas, Amauri Garcia; Electrochemical Impedance Spectroscopy and Potentiodynamic Polarization Studies Affected by the Microstructure Array of a Monotectic Al-Pb Alloy in a NaCl Solution. CORROSION 1 October 2014; 70 (10): 1031–1042. doi: https://doi.org/10.5006/1293
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