Voltammetric and admittance measurements for tin deposition at a rotating disk electrode from sulfuric and fluoboric acid Sn ++ solutions have been analyzed. Apparent exchange current densities ca. 10 AJem ~ are reduced 100-fold upon addition of polyethylene glycol. With or without the additive, the conductance representing the exchange process varies with potential directly as the surface Sn ++ concentration. Localized three-dimensional concentration polarization zones in the electrolyte phase arising from discrete growth sites form the preferred interpretation, although an alternative kinetic process occurring prior to charge transfer cannot be excluded as the rate-limiting step.
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