Abstract
Measurements of polarisation resistance have been made on samples of tinplate and of blackplate coated with a vinyl lacquer and a phenolic lacquer in three thicknesses, Immersed In a range of aqueous solutions open to air. The results have been compared with the ‘electronic’ resistances of isolated films contacted by mercury, with ‘ionic’ resistances of isolated films In the test solutions and with vislble deterioration of and iron dissolved from, samples stored in the test solutions. The polarisatiOn resistance is closely related to the ‘ionic’ resistance but gives a further indication of the contnbutin of the metal substrate. It is concluded that, provided the values taken are those reached when a steady state is approached, polarisation resistance is a useful indicator of the performance of lacquer-metal systems in aqueous solutions.
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