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Influence of surface characteristics of tinplate for food cans on adhesion properties of coating
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Influence of surface characteristics of tinplate for food cans on adhesion properties of coating

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The overall objective of this collaborative project between ILVA, Hellenic Steel, SSICA and Inasmet was to develop tinplate grades with new passivation films suitable for increasing the adhesion of the new low-pollution lacquers. The passivation films, chromium based, were obtained remaining within the ambient of passivation 311 and modifying the values of some process variables. The project has been divided into two parts: study and selection of the new passivation films by laboratory and industrial tests and validation of the systems selected by means of can production and pack test. In a first step, passivated and lacquered samples were produced and analysed in a laboratory. A particular passivation cell was constructed to produce suitable tinplate passivated samples. In a second step, industrial passivation tests were carried out on the basis of the results obtained in the lab tests, using the passivation conditions that had given the best performances in terms of lacquer adhesion. Accelerated corrosion testing, electrochemical testing and surface analysis were used to characterise the chromium layer formed during the passivation trials. Physical and electrochemical tests were used to assess lacquer adhesion. Studies of both the kinetics of the cure/polymerisation process of the lacquers and IR spectra were performed. During the pack tests gross weight, internal vacuum and pH were determined. Visual examination was carried out of the morphology of the internal surface, on which dry adhesion was also measured after 0,3,6 and 9 months of storage. The passivation parameters that led to a good adhesion between the tinplate grades studied and the new types of environmentally friendly lacquers were identified. The main passivation parameters were pH = 5.5 and q = 4.5 C/dm2 together with the new-formulation epoxyphenolic lacquer (at low VOC and BADGE-free) and pH = 2.5, q = 0 C/dm2 and q = 3.0 C/dm2 with the UV lacquers. This project has established a good correlation between laboratory tests and industrial tests. Finally the process conditions and parameters applied to produce tinplate with new passivation films, on standard tinning line, improving lacquer adhesion of environmentally friendly lacquers, were identified.
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ISSN 1018-5593
ISBN 92-894-6434-8
Katalognummer KI-NA-20908-EN-S
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ISSN 1018-5593 ISBN 92-894-6434-8 DOI Katalognummer KI-NA-20908-EN-S
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