Determination of the relative position of ‘electrocapillary curves’ for Sn and Pb from the capacitance measurements on renewable Sn–Pb eutectic alloys

Abstract

Impedance technique is used for studying the time effects observed in the ideal polarizability region on renewable tin–lead alloy electrodes in 0.3 mol l −1 NaF solution. These effects are shown to be caused by a nonfaradaic process of the enrichment of electrode surface by lead atoms, the latter being the surface-active component of the alloy. On the basis of the results on the charge impact on the kinetics of alloy's surface-composition variation, the method of elucidating the relative position of ‘electrocapillary curves’ of solid (here, lead and tin) electrodes is put forward.