A method and its application are described for evaluating iron exposure on tinplate and in cans. This method is based on potentiostatic polarisation in a carbonate buffer solution. The amount of exposed iron is estimated by the size of the current and the location of the exposed iron is visually detected. Good correlations between the results obtained for storage tests and those evaluated by this method have been found for tinplate cans packed with products preferentially corrosive towards iron. Some factors affecting iron exposure in tinplate cans have been found for various types of cans made by different fabrication methods. An application of this method for tinplate is also described.
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