Abstract
The passivation mechanism of negative plates has been investigated by means of linear sweep voltammetry and scanning electron microscopy. It is found that the reduction peak of PbSO 4 is split into two peaks on a seriously passivated negative plate. This is attributed to the reduction of PbSO 4 crystals of different sizes. The reduction rate of the negative plate depends on the diffusion of SO 4 ; from the depth of micropo from the depth of micropores to the bulk solution. The narrow and long microporous passageways and the big PbSO 4 crystals in the active mass result in serious sulfation of the negative plate. The effects of the active mass structure and the additive in the solution are also discussed.
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