Effect of secondary alloying on corrosion resistance of drawn tinplate

Abstract

The iron–tin alloy layer on commercial tinplate was shown to be severely disrupted as a result of drawing in a laboratory press. This resulted in increased alloy tin couple (ATC) values for the material which could be reduced by a heat treatment after drawing. Fortifying the alloy layer by heat treatment before drawing did not have the same effect. It is suggested that the low ATC values produced by the heat treatment were a result of changes in the electrode properties of the alloy layer which did not produce enhanced performance from tinplate subjected to an accelerated simulated can corrosion test. Additionally, the samples used in this corrosion test showed uneven detinning after drawing which persisted after the heat treatment.

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