Abstract
Polarisation measurements have been explored as a means of assessing the effect of coating variations and solution changes on the rate of dissolution of tin from tinplate. For comparison, dissolution rates were directly measured. Difficulties are created by the strong effects on the polarisation curves of traces of cathodically active material or of tin in solution. Corrosion currents derived from the intersection of extrapolated Tafel lines are larger than those indicated by direct measurements but provide an index for the performance of different tinplates. For this purpose and for comparison of solutions the method seems likely to be of more value as a research tool than as a basis for routine tests.
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