Accelerated Corrosion Test for Tin Plate In Grapefruit and Other Juices

Investigation of an alloy-tin couple (ATC) test described by Kamm and associates indicates a good correlation between ATC current and grapefruit juice pack life. The effect of Sn(II) additions to the electrolyte, of the source of the tin anode, of variations in sample and anode area, of resistance of the external and internal circuit, and of scratches on the sample surface is discussed. Increasing alloy-layer thickness decreases the ATC current. ATC measurements made in grapefruit, tomato, and pineapple juices rank various lots of tin plate similarly, but in prune juice a different ranking is observed. This difference is consistent with previous data, which showed the mechanism of corrosion of tin plate for grapefruit and tomato juices to be different from that of prune juice. 8.3.5, 6.3.14