Abstract
The anodic behaviour of pure tin and a Pb-10wt.%Sn alloy have been studied in sulfuric acid solutions using the ring-disk technique and potential decay measurements. For Sn in H 2SO 4 the results show that this metal passivates partly at acid concentrations above 3 M. Tin was found to dissolve mainly as Sn(II) ions, but to some extent also as Sn(IV) if the potential is > 3 V. The ex situ analysis of the corrosion layer formed on pure Sn showed that the layer consisted mainly of amorphous SnO. The results for the Pb-Sn alloy showed that Sn dissolves from or through the corrosion layer formed on the alloy as Sn(II) ions. Tin was found to inhibit the formation of PbO 2. The effect of Sn ions dissolved in the solution seemed to be similar to that of Sn as an alloying agent. The ring-disk voltammetric measurements showed that a tin-containing compound is formed on the Pb-Sn alloy. This product is probably a mixed Pb-Sn oxide or tin-doped PbO n .
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