Abstract
Tinplate cans affected by tonality changes on their unvarnished bodies as well varnished lids were compared with other ones without defect; characterizing by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and Fourier transform infrared spectroscopy (FTIR). The Infrared analysis let identify on defected bodies the absorption bands for Sn-O-Sn bond at 609 and 619 cmâ1; while the polymer on top cans with tonality changes showed an absorption reduction at 3000 cmâ1 related to OH bonding band; as well the picks related to varnish oxide groups at range of 1700 to 600 cmâ1 decreased. The results link the defect with the oxidation of protecting metal and polymer dehydration.
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