Abstract
In attempts to learn more about the nature of protective films on tinplate some studies were carried out on pure tin electrodes in alkaline solutions above pH9. Potentiostatic anodic polarization methods were used with the intention of determining the mechanism of the passivation processes. It was found that the formation of tin oxide films was essentially a two-stage process, the second stage involving the formation of stannic hydroxide (Sn(OH) 4). Examination of films produced at certain overpotentials indicated that this probably took place by the oxidation of stannous oxide or a hydrated form of stannous oxide.
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