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- W2017231569 abstract "The effects of the low antimony content and polarisation time on passivation of lead–antimony alloys under deep discharge conditions of the lead–acid batteries were investigated at a potential of +0.7 V versus Hg ∣ Hg2SO4 ∣ K2SO4sat., in a 0.5 M H2SO4 solution. Electrochemical techniques and metallographic analyses revealed that the antimony level controls the electric passivation of Pb–Sb alloys, used as positive grid alloys. For low antimony alloys (Sb<0.75 wt.%), this passivation phenomenon is due to the formation of α-PbO, acting as an electric barrier at the grid surface, and growing through a solid-state diffusion process of O2− anions in a local electric field. Thickness measurements and monitoring of PbO growth by electrochemical impedance spectroscopy have demonstrated, by computation of the diffusion coefficient and the diffusion resistance of O2− anions, that antimony incorporated into the oxide acts as a doping element for its growth. At higher antimony levels, the two-phase alloys (lead matrix+Sb precipitates) promote the formation of a very thin layer of a Sb-rich oxide inhibiting the PbO growth." @default.
- W2017231569 created "2016-06-24" @default.
- W2017231569 creator A5013705315 @default.
- W2017231569 creator A5021920873 @default.
- W2017231569 date "2003-02-01" @default.
- W2017231569 modified "2023-10-18" @default.
- W2017231569 title "Passivation phenomenon of low antimony alloys in deep discharge conditions of lead–acid batteries" @default.
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- W2017231569 doi "https://doi.org/10.1016/s0022-0728(03)00016-0" @default.
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