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Type: Artigo de periódico
Title: Cell/dendrite transition and electrochemical corrosion of Pb-Sb alloys for lead-acid battery applications
Author: Osorio, WR
Rosa, DM
Peixoto, LC
Garcia, A
Abstract: The aim of this article is focused on a comparative experimental study of the electrochemical feature of as-cast Pb-2.2 wt.% Sb alloy with cellular/dendritic transition for applications in the manufacturing of lead-acid battery parts. A water-cooled unidirectional solidification system is used to obtain the alloy samples. Electrochemical impedance spectroscopy (EIS) plots, potentiodynamic polarization curves and equivalent circuit analysis are used to evaluate corrosion resistance in a 0.5 M H(2)SO(4) solution at 25 degrees C. The cellular Pb-2.2 wt.% Sb alloy is found to have a current density which is of about 3 times lower than that of the dendritic Pb-2.2 wt.% Sb alloy. The Pb-2.2 wt.% Sb alloy has lower current density than both the Pb-1 wt.% Sb and the Pb-6.6 wt.% Sb alloys evidencing its potential for application as positive grid material in lead-acid batteries. It is also verified that a conventional casting with low cooling rate of about 0.6 degrees Cs(-1) produces coarser cellular spacings which is more appropriate for the manufacturing of the Pb-2.2 wt.% Sb alloys grids due to its corresponding electrochemical behavior. (C) 2011 Elsevier B.V. All rights reserved.
Subject: Lead-antimony alloys
Lead-acid batteries
Cellular/dendritic transition
Electrochemical impedance spectroscopy
Country: Holanda
Editor: Elsevier Science Bv
Citation: Journal Of Power Sources. Elsevier Science Bv, v. 196, n. 15, n. 6567, n. 6572, 2011.
Rights: fechado
Identifier DOI: 10.1016/j.jpowsour.2011.03.050
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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