Performance of New Pb-Bi Alloys for Pb-Acid Battery Applications: EIS and Polarization Study |
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| Authors: | Leandro C. Peixoto Ausdinir D. Bortolozo Amauri Garcia Wislei R. Osório |
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| Affiliation: | 1.Department of Manufacturing and Materials Engineering,University of Campinas- UNICAMP,Campinas,Brazil;2.School of Applied Sciences -FCA, University of Campinas- Research Group in Manufacturing of Advanced Materials,University of Campinas, UNICAMP,Limeira,Brazil;3.School of Technology,University of Campinas–UNICAMP,Limeira,Brazil |
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| Abstract: | The present investigation is focused on the evaluation of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization results, associated with resulting microstructural features of two distinct as-cast Pb-Bi alloys (i.e., 1 and 2.5 wt.% Bi). EIS, potentiodynamic polarization curves, and equivalent circuits are used to analyze the corrosion behavior. The electrochemical parameters show that the corrosion resistance increases when the matrix microstructure is characterized by coarser cells when compared with finer ones. However, when a coarse cellular array is associated with increase in Bi content caused by macrosegregation during casting, the corrosion resistance decreases significantly. Bismuth modifies the anode/cathode area ratio increasing drastically the corrosion action. |
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