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In tin-plate production, cold-rolled strip undergoes alkaline electrodegreasing, the aim of which is on the one hand to remove oil residues and iron fines from the strip and on the other hand to cover the steel surface with hydrated silica film in order to avoid sticking of the coil wraps during batch-annealing. After batch-annealing, coloured staining of strip edges may be observed. These differences in surface aspect between axis and edges of the strip can be very detrimental to the end product as they remain noticeable even after tinning (with low tin weight) or after chromium electro-coating (ECCS). In this study, it is suggested that coloured staining of the strip edges is related to the more pronounced selective oxidation of alloying elements at the edges, due to the higher temperature reached in these parts of the coils during batch-annealing.

Additional information

Authors: MATAIGNE J M, Centre de Recherches Métallurgiques, Liège (BE)
Bibliographic Reference: EUR 14317 FR (1993) 101 pp., FS, ECU 12
Availability: (2)
ISBN: ISBN 92-826-5114-2
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