| Abstract: | Influence of oxygen on the corrosion in tinplate cans The research was made with stell plate (thinnest plate, 0,07% C, from rimmed prematerial) and purest tin in a cell according to the galvanic element. Corresponding storages were made in unlaquered and laquered cans. Citrate buffer, pH 2.4, was used as electrolyte. Oxygen effects pitting corrosion on the steel surface. The corrosion activating effect connected with this pitting even then remins when oxygen is spent after some time of storage of cans. But the steel surface is protected simultanously by tin ions soluted from the tin surface, because these ions get adsorbed particularly on the endangered regions of the steel surface and inhibit the pitting corrosion. But this protection only happens in media where the steel plate is electropositive to tin. The question of the suitability of can filling free of oxygen therefore can not be answered in general, but has to be anwered individually taking into account the relations described. |
