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Abstract

The overall objective of this collaborative project was to study the susceptibility to stress corrosion of high strength thin tinplates to be used in contact with food products and beverages. Particular attention was paid to can shape and tin coating influences on stress corrosion phenomena. Tinplate grades particularly critical for SCC risk were produced. The influence of batch and continuous annealing treatments was also investigated. Tin coating porosity and surface reactivity of plain tinplates were measured by chemical and electrochemical methods. Polarisation resistance measurements were performed. The drawing capacity of the various tinplate grades was also determined. Physical and electrochemical tests were used to assess adhesion and lacquer porosity. Lacquer characterisation was made by means of FT-IR and SEM analyses. Residual stresses were measured at different points of empty and filled cans before and after vibration tests. Fast and slow polarisation and slow strain rate tests were performed to evaluate the tinplate/specific-medium couplings in which stress corrosion may occur.

The tinplate grades studied (particularly critical for SCC), having continuous or batch annealing, different low thickness, a minimum tin coating weight of 2.0 g/m2 and lacquered with a standard epoxyphenolic lacquer, proved to be optimal for SCC-resistant cans to be filled with vegetables and meat products. All industrial pack tests showed no evidence of failure due to SCC independent of shape. The results obtained indicated a good correlation between laboratory and industrial tests.

Additional information

Authors: CHIODI D, ILVA SpA, Genova (IT);MONTANARI A, SSICA, Parma (IT);KIROPLASTIS V, Hellenic Steel Co., Thessaloniki (GR);PE?ALBA F, Inasmet, San Sebastian (ES);PEÑALBA F, Inasmet, San Sebastián (ES)
Bibliographic Reference: EUR 20909 EN (2003), 145pp. Euro: 25
Availability: EUR-OP reference: KI-NA-20909-EN-S Available from EUR-OP sales agents URL: http://publications.eu/general/en/publications_en.htm
ISBN: ISBN: 92-894-6435-6
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